Task answer notes from luisa

Task 0

I really hoped that I had successfully reached everyone with some content in June, or at least that people would have time to go back and go through it all again. Remember, my last words to you all were to go home, find a quiet few hours, and go through the wiki again with your notes? Because I knew we'd gone through a lot, very fast, but I also knew that you all had been doing things right (=correctly, confidently, independently) while you were here, and that it was going to take some review with the materials on the wiki to get it all straight. But it seems that I didn't successfully reach everyone, and apparently no one had time to go through it again. I will try to make sure next year's teams come later than June so that the visit is closer to getting tasks done and farther from vacations...

If you are really feeling terribly underwater here, really, please, sit down with the Working with CG4+SA101 page. I promise, there are TONS more words and instructions and step-through-it exercises there. When I say I am proceeding as if you are familiar with the stuff from before, I really do mean it... If absolutely the only thing you get out of this is successfully actually learning just one or two of the tasks from the summer and never getting into this, then that's fine, it's still more than you knew a year ago.

Task 1

TASK: spot-check some of my photometry

Still needs some spot checks. Have only heard from Russ that maybe one is wrong. Have not put in the time to resolve this one.

NB: SPOT CHECKS does not mean DO EVERY SINGLE ONE. It means do enough to assure yourself that (a) you know how to do it, and (b) that I did it right in at least a few cases. HOWEVER, having said that, in another few steps, you'll need to investigate each one separately in as many images as possible, so it is probably worth LOCATING the objects in a few different Spitzer frames, even if you don't do the PHOTOMETRY. Are they all point sources?

Task 2

TASK: look at the short lists of YSO candidates.

FAQ: wondering which files to use? *ysocand.tbl.

which are duplicates? there are several that are rediscovered between the tiles. i'll leave it to you to identify the specific ones. from the entire catalogs, there are more than 1000 objects in common between the frames.

are there any that should have been rediscovered but were not? no, that is -- if it was in both tiles, then it was identified as a YSO in both independent detections.

Task 3

TASK: did we rediscover any of the [previously-identified YSOs]?

yes, yes we did. i get 5, or possibly 6; see next item.

are there any in the maps that we did not rediscover? yes, possibly 1.

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?) I HAVE NOT COMPLETED THIS TASK but i can tell you that some strongly contributing reasons we did not recover one of them is because (a) it requires a larger than "usual" coordinate shift to match it to one of the catalog items (is that a true match? are there other sources in that region it could match to?); (b) for the closest match, we only have 2 irac bands in the catalog, which means that the gutermuth method could never have recovered it. (why do we have only 2 bands? is it on the edge? it it saturated? i don't know; i am leaving this to you.)

Task 4

TASK: for each of the YSO candidates, [investigate them at other bands]

i guarantee you that at least 3 of the YSOs should be dropped because they are not really stars. not telling you which ones! you go figure this out ...

Task 5

TASK: for the new YSO candidates[...]go get the optical

OK, so this was WAY WAY WAY harder than I thought it would have been. there were TONS of duplicates within the optical catalog, as well as objects with no photometry at all. I did this merging and will email around a merged catalog.

Task 6

TASK: [...] make some color-mag and color-color diagrams

I still think you can do this one. look at the IC2118 paper for specific examples and ideas.

Task 7

TASK: [...] make SEDs

I still think you can do this one. I sent around examples before, and will send around new examples with the optical included. you need the wavelengths and zeropoints of the optical bands, which I will provide.

Task 8

TASK: [...] SED slopes

Let's wait and see if you get to task 7 before I just go ahead and do this one.

Task 9

TASK: [...] 3-color images with sources indicated

hint: use region files and ds9.