09:20:24 So far, I've been asked to talk about.
09:20:27 I feel data in general terms.
09:20:30 So this is going to be, or this story is going to be composed by two parts. The first part is maybe an overview of a few data. And the second part is going to be an example of software that I find particularly helpful for exploring.
09:20:47 If you date.
09:20:48 So.
09:20:50 So what is a few data, well I feel a stands for integrity unit.
09:20:57 And sometimes you can also find the references to a Fs, which stands for integrity respectable retail field spectroscopy.
09:21:08 The idea here is that with this instrumentation you have.
09:21:14 It's a combination of imaging and spectroscopy.
09:21:19 Here is an illustration of a few data cube, in which you have a galaxy.
09:21:26 In the field of view.
09:21:28 And then the other cube is composed by three dimension three axes to a special access, and one spectral access so for every single position in the sky within the field of view.
09:21:41 You also have a spectrum associated to it.
09:21:44 And this is very helpful because you can also show you how our galaxy like this you can ask. Okay, what does the spectrum of the galaxy look in this part, compared to this part, or compared to the center or compared to that object here, etc.
09:22:01 And also you can think about when you can extract information in another way, so you can also go to a fixed wavelength and ask okay how does the feel of you look like at that particular wavelength, and you have an image.
09:22:16 So it's very powerful for us through physical purposes.
09:22:23 And sometimes the repetitiveness is about pixel pixel unboxing.
09:22:29 This is terminologies convention.
09:22:33 When we usually refer to pixels. It's about an image. So, only an image with two dimensions. So, element of that image is a pixel.
09:22:44 And as Paxil is an. It's an element of the cube. So, in the, in the, in the two special access. So, the difference between a speaks in a respectful will be that the pixel is just about you, in the in the image as Paxil has on a spectrum, associated to
09:23:05 it so has several values. a put each wavelength.
09:23:10 And finally I wanted to comment on the box self concept, the box it will be the volume element of this data.
09:23:17 So it will be only one value but it has to be a specified position in the sky, and a wavelength.
09:23:27 How to say a few words work in, basically, you need to always go through an aspect of graph to be able to produce a spectrum.
09:23:36 And the way to do that in the RFU concept is to do it in independent videos of the sky so you can know that on a spectrum is associated to a given a distinct William in the sky.
09:23:51 And there are several ways to do that.
09:23:54 Here are three examples with a let's let's fibers and imagine slices.
09:24:04 That can be used to finally produce a data cube, want to emphasize in this first part of the podium that when you get from the telescope, it's not about accountability.
09:24:20 And then you need to do post processing to go from, from this situation here which is suspect trying a CCD a two dimensional spectrum sec, to allow the queue.
09:24:36 As the one that we were looking at before. Some examples of instruments that have a fuse.
09:24:49 I wanted to emphasize that several respect overlaps have a fuse, even though they might not be so commonly used by our community, in particular, So do most of my life.
09:25:00 I appeal or five seconds, times in seven or 3.5 seconds.
09:25:08 In, the, the other stuff my, we decided on a few.
09:25:15 From the beginning, like manga.
09:25:18 It's composed by a fierce of 32 seconds in diameter.
09:25:27 Given.
09:25:27 We've got the fibers of to Article speech.
09:25:30 So, the idea of manga looks like something like that.
09:25:34 Next round with a little fibers inside. And for every single position within that AXR one, you have a spectrum associated to the fiber, that is closer to that.
09:25:48 The limitation here is that the insights of the fiber is to accept and so you cannot resolve.
09:26:07 in this particular turtle I want to now focus in the second part of the show they got this particular a few, which is muse, which is the larger the in the available.
09:26:21 With this a large telescope operators.
09:26:24 In contrast to manga. This one has more than 100,000 boxes on part 230.
09:26:31 And it just has a pixel size of point two x a console thing time smaller than the fibers of manga and feel of your that is much larger year four times.
09:26:46 Oh, sorry, much larger than the than the manga.
09:26:54 In, quickly, what does it mean look like this is missing the telescope. She was a person do some fixing indigenous and the instrument, news, is an instrument composed by 24.
09:27:08 So that's why so lot. We are 24, independent, if you are used to combine and analyze the, the field of view of the instrument.
09:27:23 Briefly, but the instrument does it say it will shake the, the field of view interact Angola video like this, then the back to the field of view in 24 channels, and each of those channels are going to go through a different if you take an opinion.
09:27:42 In order to slice the field, there is a popular speaker, which is several mirrors like that.
09:27:48 And then once, once you are in a given tenant.
09:27:51 There is a imagine slicer, like that on the top.
09:27:56 that slice the talent into 48, different slices, different videos. Each of those are going to go through on a spectrograph produce spectrum.
09:28:08 So 48 spectrum, times 24 channels. So you have a lot
09:28:16 to the spectrum, out of the full instrument.
09:28:21 This is how one of those single images in this is me look like with 24 to the spectra.
09:28:28 And you have on a spectrum of course in the vertical direction. and in the recent election, depending on the sleek, you will have different position in the sky, depending on how is your character slice located within the within the tunnel.
09:28:47 Of course, once you get to this point of having the to the specter of all of the talents, and all of the slices.
09:28:56 It is convenient to reformat the information as a single data cube.
09:29:09 It's much more convenient to work with the cube, rather than to work with this to the spectrum in a society that's don't typically as part of their reduction for process.
09:29:15 If you data us it's going to be another cube can be a site that has tons of kids fight with three axes.
09:29:23 In contrast to an image we have only two axes. So here I showed you your part of the healing of new stuff.
09:29:30 So it has a 315 pixels in one reduction in the sky 319 pixels in the other direction or responses.
09:29:42 and almost set the 700, a excels in the, in the web language.
09:29:51 And that's going to be our topic.
09:29:57 In the next 10 minutes, I'm gonna give an example of the software used to analyze data cubes in for a quick inspection.
09:30:07 A must do.
09:30:08 And this is a software I recommend. It's called coffee view.
09:30:16 It's, developed by Thomas work, and you can find the documentation here in his webpage.
09:30:22 You can download directly the binary file for Linux Microsoft Windows and Mac OS X.
09:30:31 And it seems to be well supported.
09:30:35 As far as I know with other users.
09:30:39 So now let me show you one example, but I want to stop here to, to answer possible questions regarding the, the concept of the IP before going to the.
09:30:56 In the second part. That's, I cannot see a taxi sorry yes.
09:31:00 Yeah, I think.
09:31:14 Go ahead and raise your hand now.
09:31:18 And I'll wait about 10 seconds will people contemplate maybe they have questions now but I think that was, and we can wait to see if anybody raises their hand.
09:31:33 I also wanted to say that you can also use our software like this night as well that's good as well formatted enough it's a fairly standard is nine to be able to to know that.
09:31:40 I know what I, I remember when I was a graduate student. So, a long time ago.
09:31:47 We used a cadence, I think, which is like a radio astronomer package that was developed by Australians, and I remember really liking that one too. Yeah.
09:32:00 Cuz I think right
09:32:05 me karma was it called car like the full package vitamin called karma.
09:32:09 Okay, Yeah, there may be others, of course, I am familiar with that particular one. Yeah. Yeah. All right, I'm not seeing any hands don't want to keep it, keep it to you.
09:32:19 Okay.
09:32:22 Here.
09:32:23 So let's have another QA of data.
09:32:28 So I'm going to open it with a new one.
09:32:40 Just executing the binary. In order to use downloaded from the webpage. It asks you to select the primary sorry the extension.
09:32:44 And when I select the data extension. This is the balance extension for the new data clips.
09:32:51 So you select data it loads. Here's the data.
09:32:55 So, you can, similar to the US nine another somewhere you can select the, the cut levels.
09:33:03 And you can see, I feel of view, this is one minute by minute.
09:33:23 There is a keystroke that you can use to go and get distances from the given the WCS. So, 60, seconds.
09:33:20 By 60 seconds. You can also use it to measure distance from one source to another, etc.
09:33:26 And this is just an emerging a single wavelength which is given here. So in the in this panel, you find the position the sky.
09:33:35 And in the, in the bottom panel you find a spectrum associated to the pixel or respective. I've been a. I am located in this case, it's disrespectful here.
09:33:46 Let me just go to this source. So here's a star, and you see the spectrum of that the star.
09:33:52 I can move the mouse and tries to find a galaxy here. So I found a galaxy.
09:34:01 And that particular aspects of this particular aspect.
09:34:06 You can also do some larger apertures so you can, let's say a circular aperture of three pixels revenues will look something like this. And you have a better signal to aspect of that particular source, because you're summing up anymore.
09:34:25 You can some, you can take out of that, in this case, our concern is the same as just the normalization factor, but you can take medium and the, the shape of the spectrum that you get in that particular opportunity changes a bit.
09:34:41 Now, this is a. Here's a spoiler spectrum, but here I see only the wavelength associated to this right here so so that particular way around 7000 actors in another thing that you can do is a tick.
09:35:03 Sorry.
09:35:03 So I want to show the field of view, if I move in different variants. This is how the data look like.
09:35:23 When, when you're renting a property the specter you get cleaner, quality of the image.
09:35:29 You can use this to look for sources that show up in one single wavelength or, or if you want to integrate in more wavelengths, you can do that on the fly here as well.
09:35:42 By taking an average for instance, this takes a little bit because he's doing the summation on the fly.
09:35:48 But now it's going to show an image of the food, a cube collapsed, along the rebel and direction,
09:35:57 and which is very useful because you will see things
09:36:03 like this. So now we see what I get that we're not so obvious before in a single wavelength, and you see the act and look much brighter.
09:36:13 And you can even see fainter segments that otherwise are not so obvious to see within the context of view you can also select different regions, because boxes to produce the spectrum.
09:36:29 That is shown on the bottom.
09:36:31 So for instance, I can select a career like that. And that's shown in the, in the green part here.
09:36:41 I come up this to the green part and it's going to sum up this picture of a class that I can keep doing this for reference purposes for instance.
09:36:54 And I can also do readings, known as say squared I can I can
09:37:00 I can add a single success like that or I can remove pixels with keystroke that it was like, you know later to the documentation in the web page.
09:37:12 And you can do that for for reference purposes.
09:37:18 Whatever pursue you you like.
09:37:33 In the final three minutes I have, I want to show you one characteristic I like a lot about perfect view, which is the fact that you can produce a map, or you can produce a, kind of, let's say, novel, send another bomb, Peter maps.
09:37:43 We know this field, we have been using this data to to study one particular galaxy this field with a delegation of art.
09:37:51 So we know that that is a galaxy here right on top of the art, but it's not so obvious when we look at this particular integration, if I place the cursor here.
09:38:02 I see the galaxy because this is a proxy into a mission from the galaxy.
09:38:08 Now I can do a pseudo narrowband filter Peter center in this to a feature with a keystroke to seek a stroke to the documentation, I can point to that later.
09:38:22 And this is an imaginary line map center on that particular woman range that I selected in the bottom, many sources have continued, or, or lines, many sources can flex on this webinar.
09:38:37 But now I can take continuum reference living right on on the side of that to subscribe to this and just yet, like a mission around that particular webinar.
09:38:56 So I'm going to take this as a reference and, and this is what you get is a narrow band continuous obstructed, the image online map. So, it's a bit complex because it has this a minus, this part here, integrate.
09:39:06 And this is the galaxy that we studied in one of our last papers on traditional art demography.
09:39:17 So, this is oxygen six galaxy you can resolve, more or less the kinematics of the galaxy you see how the mission line shifts, especially the centers of the lines, and it will come back to A.
09:39:31 The, The original format.
09:39:40 There is the UK here, and you can go for a mason to associated to that particular redshift, which is this one here.
09:39:51 This is the minus on to doublet associated to the galaxy just show here.
09:39:57 And you see that the minister to system when we're close to the galaxy.
09:40:01 And we move along the art, and it's gets weaker and weaker until a point, you can no longer see the medicine, too.
09:40:13 But that's how we can be particular way we solve the was not resolved, we have a coherent mechanism to map in the CGM of a single galaxy with several contiguous positions.
09:40:27 If we go to the next segment.
09:40:29 That is not only some to show up somewhere here.
09:40:34 And it doesn't show up in this particular industry up here.
09:40:40 And there are other features. Besides, the ones I just showed that are worth exploring for the Cooper's view, many options.
09:40:50 I haven't even tried myself, but there are some spectral analysis options that you can you can use and I'm not going to do now because I'm out of time but can I can show you some other capabilities of this particular software.
09:41:06 I wanted to finish saying that this is a very nice offer for exploring data, but not necessarily for complex analysis, I mean there are some analysis that you can do but if you want to have a more complex analysis.
09:41:21 I recommend to do that with a with a script and reading the data cube with a Python package or whatever other software packet and accessing the data key was not the array, or, or, or equivalent to do more complex analysis, but this is a very good software
09:41:41 for exploring the data.
09:41:43 So, that's it.
09:41:48 Thank you, Nicholas, I absolutely love if you data is just so rich and this is such an amazing tool for at least like getting that kind of first idea of like what is here in this field and I love the example that you chose in particular.
09:42:06 And so yeah that that's just really, really remarkable.
09:42:12 What a beautiful image to with that lovely arc there. So I am going to suggest that you moderate the discussion and that we just kind of that we can hang out here and and and discuss and ask, ask you questions.
09:42:31 And so, yeah, let's let's open up the floor to questions about if you data or just in general about this field.
09:42:40 And while people are thinking of them, you can just raise your hands or unmute since, you know, there's not a huge number of us but what was the, so the galaxy redshift I didn't like a quick by I think was like point seven three, and that that you were
09:42:55 showing that was on top of the ark, what's the redshift of the ark, it's like, what is it like it must be like point eight or something like that because I saw the magnesium to up a little further.
09:43:07 Below the. Let me. The arc, it's a much larger a higher activism to point something I forgot to point something. Oh yeah, we architect the mission of the ark.
09:43:35 So, yeah, she was lucky.
09:43:25 Well, let me just so this is a feature a big second feature of the ark.
09:43:30 I forget what, what was the Coventry.
09:43:35 I don't remember that.
09:43:53 The Galaxy, I showed this point seven three. And there might be some to that I was showing you some point seven three as well, right yeah I just wasn't sure what the ark was, I knew it must be higher mention if I thought those absorption lines that I
09:43:50 was seeing I'm just the ark itself word something else but anyway cool, very cool. All right, more questions for, for any violence in this discussion especially, I'm interested.
09:44:02 Maybe in hearing from simulators that might want to try to make their own data cues.
09:44:10 I have a question.
09:44:14 This is for Nicholas and also other people. What software do you use to, well if you observe the fields and measure and you really have to remove the diffuse background or scatter light or any calibration imperfections perfectly do us any post processing
09:44:34 software for this and sometimes I worry about comparing faint emission data from different.
09:44:47 I have a difference and warfare structural grace I worry about the absolute surface brightness calibration comparisons.
09:44:52 Yeah, that's very important concern. And actually, a. I think it's, it's very difficult to remove all of that defects, want to emphasize here, that even in this reduction that we believe is good for our purposes.
09:45:10 You can still see some of the different elimination patterns of the, of the image slices in this particular instrument.
09:45:19 And that might also be true for other ideas him.
09:45:24 So, the right it is.
09:45:34 It's tough to calibrate the low surface brightness in the intellectual of view.
09:45:37 It's not trivial.
09:45:39 There are some work to do that. The, the, to, a good job.
09:45:43 But your soul, you always have to be careful.
09:45:59 The particular prospect.
09:45:52 In, yeah this cube that you gave an example of is that something that's that's delivered to you like from, you know, Muse after your data is taken without any kind of additional post processing on your part or what we're, what's the source of this one
09:46:14 been reduced by A. I forgot I need to take the heroin. But I believe this one has been reduced by a member of our team has been post-process to remote song.
09:46:35 Sky sky received once using a very nice software that works very well for a newsletter called SAP.
09:46:53 But, but it hasn't been particularly, look at this.
09:46:53 Low Level flux variation that you can emphasize here.
09:46:48 When we do this, the summation in.
09:46:57 So, the news that you that Esau is going to give you from that can be similar to this, but probably lower slightly lower quality than this one. but you can also do better quality reduction.
09:47:11 The analysis needs needs that particular paint yourself into a project.
09:47:23 So Cameron What do you think, can you turn Trident into an if you.
09:47:45 Yeah, I think so, I think, I think there's definitely room to expand tridents functionality to be able to like produce data cubes like this. Yeah, the noise here as you can see it's, it's not trivial.
09:47:50 You see all of these patterns.
09:47:52 What we have done.
09:47:54 As a first attempt to reproduce simulations, like, we're going to start with a idolizes spectra like normal I suspected when we multiply by the continue that say appraiser whatever additional arc.
09:48:10 And then we basically just one way to do that empirical is just to, to have an estimation of the noise in political noise. Now that acute and other spectrum.
09:48:22 On top of that, rather than that them similar dinners because this stuff adoption notes anymore.
09:48:27 And it's going to be different reports here or, or, or different source points here.
09:48:37 And it will be nice to, to think about that for future.
09:48:42 Yeah, and another point from Target.
09:48:46 Thank you for commenting on that the Trident, the sidelines, as far as I understand, these are like a passive beam sightlines right in.
09:48:58 It will be good to think about how to extend that to extend a toast with different mission.
09:49:08 There's been, there's been discussion with Evan Schneider and Kate Rubin to try and do extended sources with Trident with existing functionality and I'm working on.
09:49:19 We're all putting together some modifications to the code so that should be for like down the barrel observations, we should have that kind of functionality parameters in the next like month or so.
09:49:31 But yeah, definitely that's a stepping stone towards something like, like, like what you're proposing here with the RFU datasets.
09:49:40 Excellent.
09:49:43 Future.
09:49:45 Both observations and simulations, I noticed there are some Casey wi users here to I don't know if any of them want to comment on similar tools to look at like Casey wi data or how it looks different, or anything like that I've never looked at a case
09:50:04 of wi data or news data myself, I, I have kind of data MD, somebody who just does the pencil beam stuff.
09:50:15 I think we all use Cupid sale.
09:50:19 Yes, we all do.
09:50:21 Okay so cute Cupid's view is kind of state of the art, I mean it's really amazing.
09:50:30 Um, I was wondering if anyone is involved in some either data reduction or post processing or analysis tools that will be useful for all if the data taken for all instruments like some standardized reduction parties like iPads, because like I mentioned,
09:50:50 and I guess everyone is worried about it's absolutely comparison Salter suffers brightness values.
09:50:58 guess f1 is worried about its absolute or comparison salt or surface brightness values. Yeah, I wonder is anybody. I don't think Chaska is here.
09:51:04 But, you know, he's, he does this pipe pipe in thing it does that have is that if you compatible type it yet.
09:51:13 Does that have is that if you compatible pipe that yet. Do you know
09:51:16 i mean that's that's kind of the idea behind that software as far as I know.
09:51:23 Okay, it's here.
09:51:23 I think it can can pretty much reducing Casey wi cube.
09:51:31 Depending on the data of it, and the setup, not all of the setups are in the pipeline yet, but it's pretty much there.
09:51:44 And then, I mean, you would need to like import some instruments specific parameters, but in theory, then if it can be a case to give you I can do any of you, right, like, as long as the instrument properties are put into them.
09:51:59 I will say that not all have the same design so I don't think it's so straightforward to just change parameters in a, in a code. If you have to change the workflow.
09:52:12 Sharma order.
09:52:15 Yeah, in the sense, manga I feel is different than a demo site if you amuse concept is different cases the VI concept.
09:52:27 I'm not sure if you can have a.
09:52:31 I think it will need a new recipe completely different recipe preaches from.
09:52:53 Perhaps another expert in instrumentation, what an expert in it instrumentation can implement what would be amazing too is if you could use. Okay, so you have like your simulation.
09:52:47 Okay, so you run Trident on your tng, you know, 300 simulation you use all of these publicly available tools, and you got your data cube, and then you can put that data cube, right into Cupid's view and look at it side by side with actual Newsfield.
09:53:10 I think that that's a cool thing to look forward to.
09:53:20 All right, one more questions. I can add that, I'm just for longer data, there's a website where you can explore among the data and access it. Marvin.
09:53:35 If anyone is interested I sorry I'm not.
09:53:41 I'll just I'll just put it, I'll put it in slack later. I appreciate that.
09:53:47 That I mean it doesn't allow you to do as much as to fix view in terms of interacting with the, with the reduced data, but it does show you, you know, the velocity profiles across galaxies, and many many derived quantities.
09:54:08 So that might be useful and fun to me you know it's very easy to interact with the galaxies and pick out your favorite galaxies so I'll put that in. In the slack.
09:54:19 Awesome. Thank you.
09:54:23 All right.
09:54:25 Alright, well if there are no more questions or comments, this is a good time to wrap up for the day, with the six minutes to spare. Um, I don't know if if they're here but thank you so much to all of the tutorial leaders today, today was I think just
09:54:44 an absolutely exceptional tutorial day with three true tutorials.
09:54:50 And so that was, that was really fun, and.
09:54:54 Thank you. Thank you all and thank you for this amazing workshop super awesome