CG4 Fall Work
This page is to capture the plans and results of our work in Fall.
Backing up one step to review:
a) Goal & Proposal: the goal here is to look for old and new YSOs using all the archival data we can find. Our original proposal is here: http://coolcosmos.ipac.caltech.edu/cosmic_classroom/teacher_research/r4-cg4/cg4Proposal.pdf but also linked from our research activities page http://coolwiki.ipac.caltech.edu/index.php/CG4_Current_Research_Activities there is a page on the proposal which links to the final proposal as well.
[NB: In practice, by the AAS, i don't think we will get to the X-rays we advertised, nor the spectroscopy, but we will include the optical through 24 um photometry; see below.]
b) Deadlines: the deadlines we are working towards are:
- Oct 1 for AAS abstracts to be turned in
- early Jan for poster printing in time for me to carry them to the AAS.
c) What we've done so far: the stuff we did last June is summarized here: http://coolwiki.ipac.caltech.edu/index.php/Working_with_CG4%2BSA101 and for each of the big steps, there is an indication of what we did together and what i originally expected for you to continue to do on your own.
IMPORTANT: At this point, I'm assuming that you remember and fully understand everything that we did together through the "making color-color and color-magnitude plots" step. The stuff below that we still need to complete includes the last two steps from the "working with cg4 and sa101" page: "making seds" and "analyzing seds". If you do NOT understand what we did before, now is the time to go back and review in detail what we did before. If you have specific questions that you can't solve by talking to others and puzzling it out within your sub-group, please let me know and I'll do my best to answer them.
DVD file listing for CG4 team - by popular request
AAS abstracts and global poster plans
The deadline for the abstracts is Oct 1. As you hopefully recall from the talk and discussion in June, the abstracts do not have to be long and detailed. They are often short and vague. We do need to have a complete list of our expected posters, though. Here is what I think is the plan; please let me know if you have ideas for more posters. (Don't forget to review the authorship policy, specifically as it applies to the whole original team being included as authors on each of these):
2) Outreach poster I. Version Dec. 29th Education Poster Version 13 Media:Educational_Poster_13.pptx Go to Discussion tab to see a screen shot of this poster.
Connie (?) is leading a poster whose working title I failed to write down but will be something about integrating stuff learned from this project into the WSD and WSVI environments. There will be specific roles for Chelen's students in this. (PLEASE let me know if i have this wrong.) Connie to circulate abstract as soon as possible. Link to Education Poster ver. 12 Media:Educational_Poster_12.ppt
3) Outreach poster II. Carolyn to lead a poster on the incorporation of the NITARP experience into the Pierce College environment. Carolyn to circulate abstract as soon as possible.
After we turn in the abstracts, or even prior to it, we should get into the nitty gritty of doing what still needs to be done on the science analysis. This is the next section.
Tasks that still need to be done prior to the posters being complete
Just as we all together did photometry on certain objects and compared the results to check and see that we're all doing the right thing (myself included), I expect that these tasks will be similar, e.g., everyone, or at least every sub-team, does everything and we all compare results. I've set up pages for each task so that you can post your results.
This is stuff I have NOT done, and frankly don't have time for right now! So I really don't know what you will find or what the 'right answer' is. So you better understand what you're doing and believe you're doing it right!
When we get to the process of writing the science poster (at least, maybe outreach too), THEN there will be ample opportunity for individual assignments, e.g., person1 writes the intro, person2 does some 3-color images, person3 writes something on the image reduction, person4 makes/collects the SEDs and writes some text, person5 writes conclusions. Just as for the proposal, I am your safety net (and editor), not the primary author of any of it! This is YOUR poster!
*****For specific how-to instructions on most of these, see the Working with CG4+SA101 page.*** New 20 Oct - I've added links here to specific locations in the CG4+SA101 page with the additional information, and note that sometimes you will have to follow the links there back to the L1688 page, sorry.
0) Recall that I've already done the photometry and have a bandmerged catalog from J through M24. Recall that my M24 as it existed when you were here in June was wrong; I have updated photometry, catalogs, and mosaics, some of which I sent in email, some of which you may have to download from me separately; let me know what you need. Recall I already applied the Gutermuth color cuts to obtain a short list of YSO candidates. META-TASK, already discussed above: make sure you understand what that is and why it's important. (reading material: Doing photometry, Bandmerging the photometry, Making color-color and color-mag plots (NB: latter has link to Gutermuth paper).)
1) I did photometry, but there's no guarantee I did it right. TASK: spot-check some of my photometry from the YSO candidate short list. are we in agreement? post your results here then see luisa's notes. (reading material: Doing photometry, Bandmerging the photometry)
2) Recall that the two pieces we worked with (CG4 and SA101) actually overlapped on the sky. As such, the two short lists of YSO candidates actually 'rediscover' the same objects between the two tiles. (If it doesn't rediscover all of them, that's a problem too.) TASK: look at the short lists of YSO candidates. which are duplicates? are there any that should have been rediscovered but were not? post your results here then see luisa's notes. (reading material: Working with the data tables.)
3) Recall we assembled a list of previously known objects in CG4 and SA101. TASK: did we rediscover any of these? are there any in the maps that we did not rediscover? why did we not rediscover them? (e.g., do they not have any IR excess? if not, why were they identified as young before? can you think of a reason for this discrepancy, if it exists?) This needs to go in the poster. post your results here then see luisa's notes. (reading material: Previously identified sources, Investigating the moasics, Working with the data tables.)
4) Recall that the color cuts are fallible and may accidently drop YSOs or retain galaxies. TASK: for each of the YSO candidates, use the IRSA finder chart service or another similar service of your choice to investigate these objects in POSS and 2MASS images. do they look like galaxies or point sources? if they're galaxies, obviously they're not young stars. post your results here then see luisa's notes. (reading material: Getting data from other wavelengths, Making color-color and color-mag plots (NB: this has link to Gutermuth paper).)
5) WAS/IS HARD I have the optical catalogs from Serena, in two pieces. TASK: for the new YSO candidates that survive the merging and the imaging check above, go find the optical measurements in her catalog. (email me to get the catalogs.) i DID do this by writing code; there are few enough YSO candidates that I THOUGHT YOU COULD probably do this manually. post your results here then see luisa's notes. (reading material: Working with the data tables.Bandmerging)
6) For the poster, we need color-mag and color-color diagrams. TASK: for the entire data set and/or for just the YSO candidates (including any previously identified that we did not rediscover), make some of these diagrams. do they look like you think they should? (what should they look like?) where are the YSOs? the galaxies? don't forget that you also have 2MASS and optical data, so you have something like 10 bands to choose from for comparisons. post your results here then see luisa's notes. (reading material: color-color and color-mag plots)
7) COULD BE HARD For the poster, we need SEDs. TASK, and this one's a biggie: for the YSO candidates that survived the tests above plus any literature-identified ones that we did not rediscover, convert the mags from the catalog into flux densities and then energy and make spectral energy distributions. WARNING: this is likely to take a lot of time and involve a LOT of unit conversion. you WILL do this wrong the first time. and probably the second and third times as well. recommend you use excel because you can explicitly debug each step. detailed instructions in the wiki for what needs to be done; though it doesn't mention optical bands, it's the same approach as for the other bands. you will need to find zeropoints for the optical bands; try it yourself but i can help on this. post your results here then see luisa's notes. (reading material: Making SEDs)
8) COULD BE HARD For the analysis in the poster, we need to know what the slopes of those SEDs are. TASK: get these values. see "analysing SEDs" in wiki page. i expect the pierce college sub-team and probably mark legassie to be able to get this far and get these slopes. it is NOT the end of the world if the other sub-teams do not get here. post your results here then see luisa's notes. (reading material: Making SEDs, analyzing SEDs)
9) For the analysis in the poster, it would be nice to know where these various class objects are on the image. TASK: make a 3-color image (at the very least, THAT should go in the poster). Bonus: make an overlay on top of it showing where these objects are. HINT: region files in ds9. post your results here then see luisa's notes. (reading material: Doing photometry (specifically some of the tools used within that task).)
When we get to this point, or Thanksgiving, whichever comes first, we will stop analysis and start writing the poster. put your poster components and drafts here
NOTE THAT I will be out of town celebrating my in-laws' 50th wedding anniversary Dec 1-8. Please plan your crises accordingly. entire file of task answer notes from luisa -- don't peek until you're sure of your own answers, and please note, not all answers are in here!