08:05:03 Good morning everybody. It's 805. And let's kick off this exciting week about the future observations that are going to transform our view of the CGM over the next decade.
08:05:19 This week will be dealing with new observations that span the full electromagnetic spectrum.
08:05:27 This is a forward looking week, and one in which we hope both observers and theorists will work together to identify how upcoming observable will translate into much needed physical constraints.
08:05:42 And so, I personally think that this is going to be the best week yet of the workshop, and we've had some pretty amazing week so far so the bar is already very high.
08:05:53 Okay so, just a few announcements before we get going. Please join Halo 21 week eight future orbs. That's the channel on the slack, where we will put most of the discussion information this week, and substantive comments to these beautiful graphic that
08:06:22 Maybe some of which will hear about today. Okay, so a couple announcements, like I said, in the spirit of a workshop photo. We're going to on Tuesday, arrange for everybody to come with their, you know, best colored shirts and, you know, combed hair,
08:06:42 and while I take a screenshot of everybody's zoom video and gallery mode, and I'll try to put it together into a lovely workshop photo that highlights everybody who's participating at least on Tuesday.
08:06:56 And what you can see here as a Friday, last week Friday if you weren't here we had a hat day, which been organized a casual Friday had day, and this picture was posted in Hilo 21 beauty.
08:07:08 So anyway right after. Chris Martin's keynote talk on Tuesday, right after the break, we'll come back and we'll do a full group workshop photo on zoom it'll be really fun okay so a couple other things today on Mondays we've gotten used to speed collaboration
08:07:28 We're going to do a structured discussion that highlights 10 observational domains. And so I'll give you all the details on that in just a minute. There are a couple other channels I want to highlight one is Halo 21 dash legacy.
08:07:45 This is a channel where we're talking about how to extend the impact of the KITP Halo 21 program beyond this week. And so if you'd like to be part of the conversation, please join that channel, So you can contribute.
08:08:00 Also, I don't have an announcement official announcement yet, but we're thinking about doing some kind of informal night on a kind of gather town or room like platform where we get together and and drink to celebrate the end of the conference.
08:08:15 So, well we'll announce details later in the week but head over to Halo 21 socializing. If you're interested in, in that. And then also, I wanted to mention that.
08:08:28 Cameron posted a note in Halo 21 announcements that he's going to put all of the keynotes and tutorials on the YouTube channel that we've been using for new results to highlight people on the market, and soon to highlight some new instruments, we're just
08:08:46 going to try to collect all of the videos in one place where they're going to be accessible.
08:08:51 You know, for for a long time this is part of our legacy. We just didn't. They've already been recorded they're already on the web, but if for whatever reason you're uncomfortable with this.
08:09:01 Please just, just let us know.
08:10:07 Okay, so then also I just wanted to highlight a couple new results are new results channel. One of the highlights of this workshop has been the new results of videos featured on slack and on YouTube.
08:10:20 These are 51 now we have 51 high quality new results video, all of them 45 minutes in length.
08:10:28 And it's really impressive what people have put together it's an incredible way to consume the kind of new results that have come out in the last year, our YouTube channel has 87 subscribers and our top viewed video by Benita Gianna and monogamy Roy,
08:10:41 how much cosmic rays can be packed in the Milky Way CGM has gone viral, it has 307 views. Wow. And I just want to highlight Nikki Nielsen up loaded a new video this weekend, on, on specialty resolve CGM a mission around nearby star, star bursting galaxy,
08:11:02 with today. This is a new survey there's also another video that I just saw that it was uploaded, either late last night or this morning, I'll highlight that later this week, but lots of cool results coming out from the debate team so go check it out
08:11:16 and new results.
08:11:18 Okay so this week. Tuesday we have a an excellent keynote to look forward to by Professor Christopher Martin. That'll be in the first hour of our Tuesday, followed by a panel discussion, featuring job or check crystal Martin truck side L, and Sarah title,
08:11:37 and I just said job check but I met Joe Birgit. Gosh, sorry, Joe.
08:11:43 On Wednesday we have three excellent tutorials lined up for you, admin will kick us off, telling us about x ray imaging and spectroscopy mission the new Hitomi which focuses on soft x rays.
08:11:57 Turns out all of the results and data from the three illustrious tng simulation volumes are publicly available and Dylan Nelson himself will walk us through some online tools for exploration and analysis of that data that anybody can use.
08:12:13 And then finally, Dr. Nicholas Tejos at Pontificia University Dhaka totally Calm down, Bob How are you so, and a frequent observer with us will walk us through some ifu data which is one of the most exciting future observations that can transform our
08:12:28 understanding of gashes halos. Thursday, we will cap off our keynote speakers with two incredible talks, first by Dr. Aurora Simionescu and next by Dr. Nick Battaglia.
08:12:45 The organizers could not decide between New X ray missions and upcoming sZ effect focused observatories which would be more transformative so both are giving keynote presentations, followed by an exciting panel discussion featuring Dr. Alexei Viklinin,
08:13:03 and Dr. Rachel Somerville, Dr Edwin hundreds clock and Dr. Colin Hill.
08:13:09 All right. And today, coming up today, right after our featured conversations. We will have an observational domains structured discussion. So what's going to happen is, after the feature conversations which will introduce in just a minute present in
08:13:26 our second hour today we'll take a slight break and then we'll go into our second hour, where I will create 10 breakout rooms. Each has one to two leaders who volunteered on the channel Halo 21 dash ops domains, and we have 10 rooms absorption line studies
08:13:41 in the the optical emission studies up optical X ray both the mission and absorption test radio verse SC effect, radio, polarization gravitational lensing, infrared and gamma rays.
08:13:51 Wow. Lots of observational domains here, we're hoping to have one to two leaders per room with people just kind of self, selecting which room they go into, so you'll have a choice.
08:14:04 You can just go into any of these breakout rooms, especially if you're a theorist and you don't particularly have an expertise you want to learn about gamma rays, go into the gamma ray room.
08:14:15 And the goal of this discussion will be to identify and clarify the measurable quantities relevant to the CGM that we will be able to constrain in each of these domains over the next decade will come back after 20 or 3020 to 30 minutes in the rooms, depending
08:14:32 on how the timing goes, and we'll share out, and what we think are the most exciting things that we discussed in these breakout rooms, so stay tuned for that but first up, I'm very excited to introduce this week's featured conversations.
08:14:50 And so we'll have a halo 21 and mission, which has been initiated by Claudia.
08:14:57 Oh my gosh, Claudia I'm so sorry I misspelled your name, Claudia Ciccone, and that's one seed because it's a hard, she Kony. All right, and Dennis a risky will have Halo 21 new instruments.
08:15:10 Glenn Rudy and Carlos Vargas who I don't know if he's here right now I'm also kind of CO initiating I'll help out a little bit.
08:15:18 And, and then finally, we'll get back Mark Boyd and Ben Oppenheimer sorry guys for not including your pictures here I figured everybody knows what you look like by now discussing Halo 21 parametric model.
08:15:32 And so that's it I'm gonna hand it over to Claudia.
08:15:36 And, and she will tell us what Halo 21 our mission has been up to. And I know that Claudia mentioned, there might be an after party at some point this week so if you're interested in this in this grabs your attention, head over to Halo 21 a mission and
08:15:52 join the conversation.
08:15:56 So can you see my slides.
08:15:59 Yes, they look great.
08:16:01 Okay, so thank you Jess, so I was asked by Jessica to, co host with Dennis this Hello 21 Ancient China. And since I'm in charge of this initial presentation of the channel and I'm submillimeter millimeter astronomer mainly.
08:16:23 Unfortunately this presentation will focus a little bit more on the submillimetre radio tracers but in the China we are discussing also other tracers, especially lyman alpha is a very popular one in the in the China.
08:16:38 So I decided to show you in the background on the first slide, this beautiful image of the northern part of the Orion molecularcloud. This is a map of ammonium taking with the govt telescope.
08:16:54 And this is because, surprisingly, the technical challenges that we astronomers that want to study the CGM in emission using some millimeter radio facilities, we are experiencing basically the same technical challenges that our colleagues, want to study
08:17:12 star formation in our galaxy are experiencing, because we want to track, we want to grow the largest scale diffuse emission. And this is incredibly difficult.
08:17:25 However, what I want to do the message I want to give you is that initial nine observations of the CGM especially in the summer millimeter regime, they're challenging but they're very rewarding.
08:17:39 So do not underestimate their power.
08:17:43 And I know that traditionally. It is believed that the CGM is challenging to observe in a mission because it's a few certified the medium, and it's hard to detect the mission.
08:17:56 However, maybe we don't know that much about the CGM, so maybe it's not so ratified and diffuse, and I'm arguing we need to be open to surprises. So my question is, are we ready to surprises.
08:18:13 And I had the chance to to test a little bit, the audience here with the survey that I did a few a couple of weeks ago in the channel where I did the survey was focused mainly on on me on the molecular CGM, and there was a question I want to go through
08:18:32 all the questions of the surgery but you can find the results in the channel.
08:18:37 So this question was, is there molecular gas at distances above 20 kilobits King galaxies. It's a very generic question okay.
08:18:48 But I was surprised to see that only eight out of 20 people. So 40% and believe that the reason molecular gas, a distance is beyond 20 kilo bar second galaxies.
08:19:03 If we include the main we we go up to 85%. And this is quite surprising for me.
08:19:09 And I will show you why.
08:19:11 So, we do absurd molecular gas above own skill set of, you know, 1015 or 16 galaxies.
08:19:20 We don't have many observations, but we do have some really exceptional results. So this is one of my favorite ones and this is a quiz I rescue 6.4.
08:19:32 That was observed in C plus by us now six years ago. And we detected the C plus C plus emission line at 158 micron is tracing a combination of gas space is trading molecular gas and atomic gas and a little bit of ionized us.
08:19:50 We don't know the proportion of the contribution of the different phases, but we know that it's called gas okay me. And in this quiz a rush is 6.4. This is an isolated place or no companions c plus extent, at least up to 30 kilo bar six from the center.
08:20:08 And you see this beautiful law, structures, most of them are due to a very very powerful outflow, which has velocities up to 2000 kilometers per second.
08:20:19 And you still up to now the most extended cold out forever detected.
08:20:26 But, a large fraction of these extended emission is actually due to gas that is quite yes and the low velocity, and there is only 30% of this quiescent gas, a little bit opposite This is actually in a compact of source, and we can tell this because these
08:20:43 are international magical observation so if you're interested, there are more details in the paper but we can tell exactly what is in a compact and what is an extended source.
08:20:55 Then, another source of disease, start forming galaxy sorry just, I think I have you appear.
08:21:01 Okay, I don't know if people can see my screen now because I have just, Yeah.
08:21:08 So, this is another star forming galaxy in the goods is also feel very massive observed without MA in SEO, and geography and collaborators detected a 40 kilo bar six sides co structure.
08:21:25 Okay, around this galaxy.
08:21:29 Receive 2.5 no sign of rotation this time no Simon, no so I know about flow this your reservoir is actually quite efficient and low velocity, low dispersion, and the results are associated fighting for a continuum.
08:21:43 It is not associated with the galaxies this galaxy as two companions about the source is actually diffuse gas, and this the 60% of it is not in the galaxies, the mass is huge is between two and six attempts to the 11 solar masses of molecular gas, And
08:22:00 it is in the diffuser CGM IGN medium and this is believed to be a protocol blaster.
08:22:19 I go a little bit fast on these results, but just, you know, to show you, maybe some of them you know already, but I haven't seen them mentioned so far in the, in the workshop.
08:22:30 This is the spider web galaxy, a famous for the class of 2.2, by the way it's embedded in the very extended Lima now for Nicola. This was a beautiful result of by beyond and Manson collaborators 90 hours on source with the telescope, but this is an interface
08:22:40 magic observation detected the DS. Huge 70 kilo bar six sides molecular gas emission. Okay. At least, 30% of it is not associated with galaxies, again, it's actually in between the galaxies, low velocity dispersion, and the mass is about 10 to the lab
08:23:05 masses. And it has been estimated that this molecular gas mask can sustain star formation in the spider web up to redshift 1.6.
08:23:15 Then, these are all high received observations so you may ask them but why we don't observe anything locally at a low redshift because it is more challenging because we are limited in, in, in terms of spatial skills and we can prob.
08:23:31 However, we do have indication at low redshift at that molecular gas extensive very extended scales, and for example we have indication very very strong constraints on the Class of, units so local galaxy managers that are very luminous in the infrared.
08:23:49 They show a very massive extreme molecular outflows okay now we have samples of 10s several 10s of sources.
08:23:59 And these outflows, we can track them up to a few kilobytes per second for a technical reason we can, it's very hard to track them further away, but this is the one of those example this is an GCC 30 to 40 and manager do ology and it has a beautiful HR,
08:24:20 And in the central 22nd region. This is a map of the CEO outflow. Okay. And here I just want to show you how beautiful is this data. This is a region of the galaxy that is away from the nucleus and the nucleus is been the part that has been studied mostly
08:24:40 by most the previous works right. And if you if you go a little bit away from the nucleus and you're focusing on region that is dominated by the outflow.
08:24:48 And you extract specter from this region you can see this beautiful broad emission in CO but also in carbon line, and the fact that we detected these initiatives your carbon.
08:25:02 It allows us to have a decent estimate of the office your conversion factor. And in this galaxy we actually found that the mass of molecular GFI now flow is about.
08:25:15 At least 60% of the total molecular gas mask that we did that in the Meritor, so even if we don't drop the outflow further away that there are a few kilo bar set from the source.
08:25:28 The author is really massive okay and I want to stress. This is a technical limitation is, you know, the outbreak stands as far as we can grow but we the data.
08:25:40 And this is another example. And you see, 253 rushes zero this is an ever closer galaxy and normal This is a normal Star Wars galaxy.
08:25:51 That has been started.
08:25:53 For many years, because it also has multi-phase outflow.
08:25:58 What I want to say again in this case I don't have time to go through the data, but again, even in this case and with very expensive.
08:26:15 Observations combining online the ACA the total power antennas CEO is observed up to the edge of the field of view of the region probed by the data. Okay.
08:26:22 So, what I want to say in this last couple of minutes that I have is that interferometry is evil. Okay.
08:26:30 We don't need to remember that if we use an interpreter we detect emission only, as far as we plan to detect. Okay. This is because every different logical observations is associated with the limited spatial extent of the nation that is able to probe
08:26:51 and this is quantify that by the so called the maximum recoverable scale.
08:26:58 That depends on the observed the wavelength, and the meaning distance between the antennas, which is a little bit larger than the diameter of the antenna.
08:27:09 Okay. So for example, Alma is a very powerful machine. But still, it's an indifferent meter. Okay, with,
08:27:26 which means that for every observation at every frequency you are limited in terms of the maximum scale that you can probe. And if you look at these numbers in boundaries still okay but basically it's very hard to prove anything that is more extended
08:27:32 at 25 sec. Okay.
08:27:43 So the question is, why the answer to the question why don't we see much molecular gas beyond the 22nd is just because we can't. Okay, we can't do the deck the structures that are more extended than this and this is an intrinsic limitations of millimeter
08:28:01 interference meters. And this gives me the opportunity to show you this little experiment that we did, it's included in this paper that we wrote for the Astro 2020 decorous RB where we were advocating for our cluster for a new 50 meters single dish.
08:28:20 Here we took as an input simulated stuff forming galaxy redshift zero this is the CEO emission from this galaxy. This is a massive stuff forming galaxy with a massive the molecular destruction war.
08:28:35 And in this galaxy the molecular gas is extended up to 80 kilo bar sick.
08:28:39 And we asked how long.
08:28:57 What do we get after 10 hours of observations with different telescopes. So, 10 hours we dogma, give us this. Okay, we don't know after 10 hours, actually to probe with this region, you need 576 pointing.
08:28:58 Okay, so you need a very, very large Mosaic, meaning that for every point in you have a very short exposure. And on top of that you have the limitation that I said that I was talking before the limited spatial maximum scale that you're able to prove.
08:29:16 So we don't know you may see a little bit of details but you miss completely the flux with ACA, even worse you don't detect anything.
08:29:24 Only we do and this was an experiment made with a 50 meter single dish antenna it keep the with a single armor detector, and you can see that a single dish, the tax records entire image.
08:29:36 Okay, no way to recover the submission with an interferometer.
08:29:39 And this actually is the last slide that I wanted to show you today is the first day actually of our three years longer you funded design study for the karma, larger purchase a meter telescope, which is the concept of for a new 50 meter, single dish telescope
08:29:58 operating in the submillimeter.
08:30:01 So, if you want to know more about this, please ask me. And maybe we can also talk about it in the dedicated China, and I leave you with the some questions and teams, which are actually overlapping with the theme so that we have, you know, talked about
08:30:19 so far during the workshop and this is what we plan to focus the discussion in the channel.
08:30:25 So, that's it.
08:30:28 Thank you so much for that cloud yeah that was a that was an exciting presentation for me I learned a lot and I think actually.
08:30:37 So next up and I'm going to ask. GWEN to share her screen.
08:30:44 I think, Glenn might even have a slide on At last, so that's that like segues perfectly into the halo 21 new instruments featured conversation and. And so, Glenn is going to share her screen and Glenn wanna if you want me to like chime in on any of the
08:31:02 slides, let me know. Otherwise I'll let you leave this.
08:31:08 Sure. Can you guys hear me.
08:31:11 Perfect. Alright, so thank you guys. Um, yes so that's a hard act to follow so we have something this week that we're focusing on a variety of new instruments that, and as well as instrument concepts that might be coming up over sort of the next decade
08:31:25 or perhaps even longer that we think could really change the game in terms of understanding the certain black medium.
08:31:32 So being largely an observer myself I picture this as sort of the new toys that we might get to play with.
08:31:53 There's a whole bunch of different review panels going on of various kinds for NASA missions and Carlos along with many of our new instrument builders are sort of focused on that for the first part of the week.
08:31:59 Alright, so jumping right in.
08:32:02 See if I can get these bands.
08:32:06 Okay, so a teaser just a handful of the instruments that will be talking about this week but there are many more and I'm hoping to get volunteers from other instruments and instrument content concepts to join in the discussion.
08:32:17 Alright so Carlos will join us as I mentioned he is the poi of a newly funded small space telescope, part of the NASA front, excuse me, NASA astrophysics pioneers category that is designed to map the warm hot gas content of nearby galaxies.
08:32:35 This is a mission called aspirant.
08:32:38 So very exciting. This is as far as I understand it is funded so it's
08:32:45 have in the coming year. So I would definitely invite you to come here a little bit more about it later this week.
08:32:53 This is a project that's very dear to my heart. This is mere moss, it's the Magellan infrared multi object spectrograph. This is a con instrument concept for Magellan, that is led by Nick Cannon Harris, I'm one of the project scientists for this.
08:33:07 So this is a large multi object near infrared spectrum applicant simultaneous YJHNK spectroscopy, all in one single shot.
08:33:16 It has a front end that's either a mass that can be configured to observe 100 different sources at a time, or very interesting procedure on science, a very large, at least for the infrared 26 by 20 arcseconds in a real field unit that will allow us to
08:33:35 do more for kinematic mapping the redshift one certain lighting medium using optical emission lines for basically the first time in the distant universe so I think this is super exciting for for new CGM studies that could happen in the.
08:33:49 Maybe just should talk about this one since she's the project scientist. Yeah, so, I'm Sarah total is the PI of this concept that we've just proposed to the NASA opera call, and it's called miraculous, and it's it's a duly pronged survey.
08:34:11 The idea is to do oh six and a mission right but to have a very very wide field to do cross correlations with galaxies to do ionizing escape fractions, and to then target a subset of galaxies that have oh six measured in a mission in there he loves to
08:34:27 that with oh six and mission mapping around a sample so you know we're in the, in the early days of this but the concept is Sarah titles, it would fly on a six year CubeSat and, and I'm super excited about it the team right now is Sarah total me.
08:34:43 Matt McQuaid and Tom Quinn and Lauren Carly's, and we're, we're lean and mean and we're looking for money. All right.
08:34:52 All right, thanks Jess.
08:34:54 Okay, so we just heard from Claudia about this, this concept that Atacama Large aperture submillimeter telescope which can detect it map the circle attic medium and molecular mission.
08:35:06 And there's a lot of other amazing things that are coming online soon so Yama is a is a blue sensitive, but wide wavelength optical integral field unit that's going to be coming on Magellan Rob Simcoe who's the P I will be here on Wednesday to tell us
08:35:22 about it, and the after party that I'm about to mention, but there's a lot of other amazing instruments coming that I'm hoping to have people join us on Wednesday to discuss, including the blue half of news.
08:35:35 The Roman Space Telescope which would could be very useful for CGM science. So hi rose which just has added very helpfully, not to be confused with tech Kairos.
08:35:44 The cosmic web Explorer, perhaps someone could join us to tell us about war.
08:35:49 There's so many new ideas coming online. That should be very very exciting for CGM science. So the plan for the week since this is one of the future conversations on on Wednesday from roughly 10am to sometime when it ends before noon.
08:36:05 Pacific time.
08:36:06 We're going to have an instrument Roundtable. And so the idea here is that everyone is invited to come learn about new instruments that are being proposed or have already been funded.
08:36:15 And we're hoping to have instrument scientists p eyes, etc. Or just people who are heavily involved with, with one of these projects come and tell us about it.
08:36:27 To the degree that they are interested, sort of, quick five to 10 minutes, informal discussions of these various instruments. If you are involved in one of these instruments and wants to want to tell us about it please please please make sure that me
08:36:38 Jess or Carlos know about it sent us emails or you can ping us on slack.
08:36:45 And we'll, we'll put this together for Wednesday I will post a zoom link and so forth in the new instrument channel so please come join us and hear about these new instrument concepts.
08:36:55 In addition to that, we'll have a few different asynchronous activities. So, Jasmine Do you want to tell us about the YouTube videos. Yeah, so one of the ideas that we're hoping to get off the ground is, and it looks like Actually, I just saw Randall
08:37:10 Smith, made a video on artists, actually a soft X ray grading Explorer. But these are you know the new instrument builders that we have on the channel are really strongly encouraged to create short videos like five ish to 10 to 10 minutes on their instrument
08:37:28 with the kind of, you know, design, capabilities and and and and the goals. The objective of the particular mission, the kind of focused science of the mission.
08:37:43 So, we would love to have those on a specific playlist for our KITP YouTube channel, just to record this for Christina of, you know, posterity and to have people, you know, be able to really understand what these new instruments are asynchronously especially
08:37:59 if you can't join this week, or be part of the instrument round table. So that's kind of the vision for it, this is these are all user, you know submitted videos so we'll, we'll take whatever we can get.
08:38:12 I know it's a large ask of you to create a five to 10 minute video is a lot of work but we hope we can collect them from you this week so, yeah.
08:38:24 Okay, thank you. And, and in addition to this, we're also obviously going to have a sock discussion. And so here are some ideas that we have for proposed topics.
08:38:34 Although, as always, new ideas and new discussion topics are absolutely welcome.
08:38:40 So the first question that we posed is what the ability is missing and needed for understanding of the CGM.
08:38:48 I also thought it would be useful to have another conversation that's a little bit higher level which is how do we organize as a community to find funding or support for new instruments or missions that we feel our field particularly needs.
08:39:02 You know the funding climate for instrumentation is not trivial right now. And so I think that this could be a useful discussion to have with so many people participating in this case at the workshop.
08:39:14 And then just you want to introduce the last one.
08:39:16 Sure. And this actually is a nice segue into the next feature conversation to where we've got mark and Ben introducing this idea of a Santa Barbara CGM parametric model, where they've tried to define all of the relevant physical parameters that kind of
08:39:32 govern the physics of the circle galactic medium. And so in the interest of the new instruments group getting involved with the parametric model group of the parameters that they'll talk about which of those parameters have the best chance at which of
08:39:48 those parameters, do we have the best chances of actually pinning down in the next decade. And I'm really curious to hear what what people think about that.
08:39:59 Perfect. Alright, so just a reminder again join us at 10am. Right after the tutorials on Wednesday to hear more from all these amazing instrument builders and instrument scientists, about the new frontier for observations of the CGM.
08:40:15 Thank you.
08:40:18 Very nice. Thank you, Gwen. All right, and so that was a nice segue into parametric model and I think Mark voice. I think you had some slides prepared right, I do.
08:42:58 So, sorry. So, but before sharing my screen I will show you that I put on my, my shirt have many wavelengths for this presentation, look at my claws I thought this would be appropriate for the day where the X ray.
08:43:15 So I'll show my slides.
08:43:20 All right, so
08:43:23 here we go. Okay, so, uh, yeah the channel we've had the channel Halo 21 parametric model open for a little over a week, and our objective is something inherent quote a Santa Barbara CGM model.
08:43:39 And there's actually a manifesto up there on the site, you can read because every movement should have a manifesto, and we're not trying to take over the world, what we're trying to do is get broad based community input on a pretty vanilla generic parametric
08:43:54 model, describing the CGM, so we can use multiple kinds of observations and multiple kinds of models to leverage a better joint understanding of what's going on with CGM.
08:44:10 So, Here's some of the inspiration for that.
08:44:15 Up on the upper left is a figure that Joel Bregman showed in the ZCGM discussion a few weeks ago, and what it shows is a joint resolved. YSZ profile for local galaxies, where they're huge on the sky.
08:44:33 And so you can use plot to get a resolved pressure profile essentially for 11 local galaxies.
08:44:44 Below it is a collection of constraints on the Milky Way's hot atmosphere, from extra absorption and admission and RAM pressure stripping, and also dispersion measure to the MC.
08:44:59 And so, there's a bunch of constraints there that are in the neighborhood of one another. And if we want to kind of get get get their combined power to constrain the Milky Way CGM.
08:45:12 We need a parametric modeling to do that on the upper right is a collection of constraints on the pressure profile around galaxies that have been observed with costs, so the UV absorption lines, give you an opportunity to estimate pressures using fluoride
08:45:29 ization modeling.
08:45:32 And one of the things you can see in the top panel of that, if you, if you have really great icing and makeup all the fine print is the pressures at any given radius, or dependent on Halo mass, not really surprising that you would have higher pressures
08:45:46 and inhale is that are more massive.
08:45:49 And when you try to take out that Halo mouse dependence, those points converge on to a more universal pressure profile.
08:45:58 What was interesting is taking that universal pressure profile and trying to overlay it on job Reitmans results from his group.
08:46:07 And it looks like there's pretty good agreement at least you know it as far as agreement, you can get by drawing lines with keynote on other people's plots.
08:46:17 Yeah, we want to do a little better than that.
08:46:32 Also, if you look in the lower right. That's a plot main by taking the Milky Way constraints and trying to overlay them on the pressure profile constraints. So, so, there seems to be some convergence possible by taking a lot of different observations from different
08:46:39 wavelengths, and combining them to get joint constraining power.
08:46:45 You can also we also would like to compare analytic models with simulations we've heard a lot about you know which, what's the best analytic description of what we're seeing in simulations.
08:46:54 This is just a bunch of lines and applied showing some analytic models and some simulations that show.
08:47:03 You know they're close to describing similar things. But what's the basis for inter comparing them.
08:47:09 So, this okay and I need to make a disclaimer.
08:47:14 This is completely a drawing. There's no science whatsoever, no data whatsoever, no models whatsoever in the diagram, it's just a bunch of wishful thinking.
08:47:26 Okay. But the point is to show that a lot of these observable bowls constrain the CGM in different ways. So if we can have a description that applies to all of them.
08:47:37 That's parametric, then we can get better leverage on the description of the CGM, then we can get from any single approach. And so, this is like a parallel to the conversations are we having this week about observational approaches, is how do we now combine
08:47:55 them.
08:47:57 And if we have a joint community description that's, you know, kind of theory neutral.
08:48:03 It will also help show how the different missions we want to propose are complimentary.
08:48:09 Now I kind of frame this discussion in terms of a pressure model.
08:48:15 But we've also heard a lot about how the season is multi phase.
08:48:20 And if we're going to understand how the phases relate to each other, rising. Can I interrupt you for one second, your color palette is showing, and it's blocking some of your slides, weird and it's not it's not shown on my own slides.
08:48:36 So maybe if I horrible I just noticed it was blocking some of that figure.
08:48:42 Think.
08:48:46 How about now.
08:48:49 Okay perfect good job with it.
08:48:58 Okay, so, uh, so we've heard that may be at the high temperature end, maybe things are log normal at the low temperature end, they are determined phone ization and there's this intermediate temperature stuff that we love to get better handle on.
08:49:13 Okay.
08:49:13 How can we combine different kinds of constraints to understand it.
08:49:19 Also we've heard a lot about non thermal pressure support, and I've crypt a figure from Ben Oppenheimer a really influential my thinking paper about how all the different kinds of non thermal pressure support showing up in simulations and how they depend
08:49:36 on radius. This kind of thing has been a has some heritage also in galaxy cluster observations and modeling and here's a paper from around collaborators.
08:49:48 So we want to also be able to describe that.
08:49:51 And here's the key. We want to be able to do it in a way that's generic enough that a broad swath of the community would like to participate, not not favoring any particular point of view, but one that is fairly generic so we can, you know, jointly cooperate.
08:50:08 So, the conversations already started. But this week, it will be featured I'm putting together right now and after party that's going to be tomorrow at 12pm Pacific.
08:50:19 And I think it's obvious that the more people who are involved and offering opinions and critiques, the more useful this efforts going to be, because you know its usefulness is is directly proportional to, or maybe even a nonlinear function of the number
08:50:37 of people who see that their, their ideas have been incorporated.
08:50:43 So, we invite as many people who want to participate into that conversation, and look forward to a future in which we can really combine the strengths of all the things that we're going to be talking about this week.
08:50:58 I will now see the floor back to just.
08:51:03 Okay. Great. Well, thank you, Mark. So it sounds like we all have a lot to think about. There are 80 of us here. Okay, there are 10 breakout rooms, each associated with one particular observational domain.
08:51:18 If you need to see that list again because my abbreviations aren't awesome, head over to Halo 21 ops domains and the pinned post there has details on what's going to happen but remember, in these rooms, we're going to be clarifying the measurable quantities
08:51:34 relevant to the CGM that we will be able to constrain in each of the domains over the next decade now we're going to take a break until 9am so a nine minute break where you can decide what room you want to participate and I've had some very brave volunteers
08:51:51 who said that they can record some of these channels, maybe not all of them. Some of these breakout rooms maybe not all of them but this is a time to learn about the possibilities and you're welcome to choose your own breakout room So, think carefully.
08:52:05 It would be really nice if we had some semblance of balance between the rooms. I'm not going to mandate that each room have the same number of people.
08:52:15 But, um, you know, if you go into a room where there's like 12 people and you see that there's a room with one person you want to be the brave soul who who goes to, you know that Less Traveled path and and joins the exciting room where few people have
08:52:29 dared to go.
08:52:33 You know, please do so so okay so let's take a break and eight minute break. When we come back, we will self organize into our rooms on the 10 observational domains and happy to answer any questions before we do that, and yeah, see you in a minute, or
08:52:47 eight minutes.