Disk Detective Talk
more information on why it's not moons: http://blog.diskdetective.org/2014/02/20/thats-no-moon/
Well, in order to actually see moons in images, it'd have to be REALLY REALLY REALLY close. We wouldn't see moons even around Alpha Cen.
just another object in the field of view..! 😃
OTOH it does seem to persist at the shortest wavelengths?
that's probably noise - see how the brightness of the 'tail' is similar to the mottles?
I see a bright star in the bottom right, not left...? That star is bright at the shorter wavelengths, but vanishes in the longer wavelengths
Yup, nice one!
(2/2) The jump happens between DSS and 2MASS, so it's ok.
Each of the surveys calibrates a little differently, so as long as it is ~same within a survey, it's ok. (1/2)
that's ok - W4 is the worst spatial resolution ("blurriest") of all the bands, so for bright sources it will appear to go beyond the edge.
if you want something to google, try "airy ring" and "diffraction spike". 😃
the circle and the spike are also part of the way the telescope responds to a very bright source.
it's a very bright star. The central blotch that is halfway off the thumbnail here is the main part of the PSF (=way the telescope responds)
you mean, in the DSS? i think that's dust from when they scanned the photographic plates.
Very good advice to be skeptical of SIMBAD, but this one is, I think, only 0.42 arcsec away from the target position. That's a match.
I think it's just noise in the PSF. Because of the stretch that was chosen, sometimes you get this mottling in the PSF.
very true, but the photometry of the target should be ok.
It's a bright source at the shorter bands, so it appears as a big blotch.
ah, sorry, missed that!
We don't know the nature of the object without additional data (spectra), so we don't know if it's a Seyfert.
We don't know the nature of the object without more data, so we don't know if it is a Seyfert or not. It does seem to be a point source.
Also, the SIMBAD source is >100 arcsec away from this object, so probably not even the same thing.
Oh, in SIMBAD, you mean? SIMBAD often has very .. odd classifications. Often inconsistent too.
Although, 2MASS says it's extended (2MASX J23025871-3848358). So maybe #galaxy.
Hm, I think it might be ok.
it even has a name: 6dFGS gJ130050.9-321238
We don;t know the nature of the object until we go and get a spectrum. But this thing looks like a point source at all bands, so could be ok
i don't think it's a cluster, but yes, #galaxy.
I don't think so; just a bright star that has somewhat of a funny stretch at the DSS bands.
We can't tell what kind of object it is without additional data. It does seem to be a bright point source, though, so a good candidate.
That's pretty hideous, I agree. The photometry may be ok, but may very well be compromised.
I think that's just the stretch. It's pretty bright at the short bands.
Yup. By a lot.
The bright + shape is diffraction spikes (how the telescope repsonds to bright stars).
This is ok - it's just really bright at the shorter wavelengths.
You're right. That's really odd - the other DSS are ok. I think there might be something wrong with the coordinates on that first image.
There are two objects, yes, but they are far enough apart that the photometry should be ok.
upper left, you mean? probably a galaxy.
You're right, there are definitely two sources in WISE, but they are far enough apart that the photometry should be ok.
This is actually ok. It appears to merge with source that's there at nearly all bands to the lower object, but the photometry should be ok.
oh, yeah, #galaxy.
It's less prominent but there in 2MASS JHK. It's the companion bright at WISE.
(2/2) You can best see this at the DSS2 IR band; there seems to be two sources straddling the "+"
This is odd, I agree. I think it's an apparent #binary. (1/2)
Ugh, this is a mess. Someone earlier tonight what nebulosity looks like. Well, like this.
@sash716 - I think this is indeed a good candidate.
I think this one is ok, actually! The interloper gets very faint very quickly, whereas the target object is getting brighter.
yes, i think that is a good one! it has a nice SED too.
Ah, no, sadly not. The thing that looks like it might be a bar is, I think, just noise.
yup, two galaxies.
so this is not a good candidate.
But look at SDSS-r band -- there are two sources there, pretty close together.. the WISE photometry is going to be affected by that.
No; nearly everything in here is too far away for us to resolve it.
this one's a good one!
Yeah, you're right, the WISE images seem to be pulled off and to the left. I can't tell from the DSS+2MASS what that might be, though.
Hm.. part of that distortion comes because it's faint, and it nearly blends in with the background noise
A planetary nebula looks like a ring. Other nebulae just look fuzzy. This thing, though..? Weird. The SED is wacky too. May be galaxy.
that looks like a nice one!
Whether or not we can resolve binaries here depends on how far away from each other they are, and how far from us the pair is.
Is it truly associated, e.g., is it really a binary? We would need spectra to be sure.
In this case, there is another source below and slightly to the left of the main source. It is probably contaminating the WISE measurements.
(by which I mean up-down)
oh, I think that's a galaxy. In the shorter band images, it's distorted N-S.
yup, or a plane.
WOW, you're right, SDSS i is really messed up. z is odd too. this one is .. strange. the SED looks like it might be a plain star.
Oh, I think that's a diffraction spike artifact from a very bright star somewhere off the field of view here.
or a plane!
Well, it's a pretty symmetric thing (aside from the artifact in DSS) so it's probably still a good candidate.
This one is ok. The spatial resolution gets worse ("blurrier") at longer bands, so big and fuzzy is ok, if it's symmetric.
Yeah, I think you're right.
You're right, it's very faint (the background is quite noisy) at JHK. It's a point source as far as we can tell, though.
Yeah, extended at the short bands. Probably a #galaxy.
But the thing we're interested in is the thing in the center. That thing looks pretty elliptical in the shorter bands. Galaxy?
Oh, yeah, there is something getting brighter fast on the right in the IR.
That is .. odd. Other than that, it's a nice, symmetric source.
yup, I agree!
Could be. But the thing we're interested is the thing in the middle of the red circle. That thing is pretty extended at H, so I'm worried.
You're right, the JHK images are very noisy - this source is very faint at JHK!
In other words, it's not an astrophysically significant shift - I agree. This is probably still a good target.
but there does seem to be an apparent companion here that is likely affecting the WISE photometry.
Nope - these objects are all way too far away for us to see any planets.
Hm, I think it might be a galaxy. SIMBAD has this galaxy at ~4 arcsec from the target position: 6dFGS gJ233214.4-363532
yup, but the target itself is ok.
definitely a #galaxy!
Its shape in DSS is also.. worrisome.
You're right, this is a weird one. The center of the object moves around even within WISE.
Artifact definitely affects J. The other bands seem like they might be ok, though.
yes, many #artifacts.
The target object here, however, seems ok.
No, the upper object could still be a galaxy, just a blue one (elliptical).
when it starts out (in DSS), it's distinctly oblong. #galaxy !
Yes, it's a bright star. The diffraction spikes (the + shape) come from the way the telescope responds to the light.
I agree, probably ok.
yes, it is very bright, and that's why it looks big.
the object is very faint in the DSS images..
That is weird, I agree- it must be an artifact. There are mottled backgrounds in the other frames, you can see, so my guess is #artifact.
certainly the bright star makes it hard to assess this one, for sure, but the photometry should be ok. the SED is awfully weird, though.
you're right... and it has an ..interesting texture as well. weird!
Ah, it is in fact a known disk! http://adsabs.harvard.edu/abs/2007ApJ...660.1556R
(2/2) This one gets bright again at the long bands, suggesting dust around the star!
This is actually a perfect YSO candidate! A disk-free nearby star would be bright at the shorter bands and progressively fainter. (1/2)
(just star formation there, not here in our galaxy)
Could very well be two galaxies..if they are really interacting, they're making lots of stars, so has the right colors to be star formation.
That's.. ugly. Weird! I'm not really sure what that is. I agree the first few frames make me skeptical.
hard to tell, but i think you are right
i think you may be right.
i think you're right.
gosh, that's really hard to tell! i think it's ok.
ah, i didn't even see the artifact there on the left. yup.
yep, i think you're right.
excellent, that is the point after all! 😃
Maybe. SIMBAD thinks it might be a #galaxy. (named 2dFGRS TGS221Z032)
I'm not sure I would say that galaxies always look smaller.
Hm. Well, 2MASS does often have better spatial resolution ("sees things more sharply") than DSS.
Well, probbly just noise.
It's a very bright source in the optical. The large cross is the diffraction spikes - how the telescope responds to light makes it do that.
From the SIMBAD link, yes, you are right, it is a galaxy. Its name is 2MASX J01424039-2920587.
You're right that the bright source on the lower right is causing the stretch to make it look like the source isn't there in W1W2.
It does look like a jet, yes! Though we would need spectroscopy to know for sure if they are related.
no, this one's ok! 😃
yup. Helpful to have as many eyes on the images as possible.
Wobble may indicate that there is really more than 1 source pulling the center off. It's hard to tell here.
Sadly, this particular varietal of 'weird' are the ones that are likely garbage. Other 'weird' may be interesting, but this one not so much.
Hm, this is a tough one. It may be extended at the shortest bands, and it wobbles around a lot across the bands.
Very true that there is a faint blue source, but since it goes away at the longer bands, the faint source is probably not contaminating WISE
Well, yes, but these images could be affected by the bright source above the target. There may be a real source there, just too faint.
I would be worried about this one as a good YSO candidate - it's just not a clean circular blob in each band.
In the longer bands, it's extended to the lower left.
In the shorter bands, it's got a second source to the left.
Wow, this one is REALLY tough. What you should be looking for is something that is near-circular in all bands. What you have here is not..
Could be an edge-on disk.. or an edge-on galaxy. Probably more likely an edge-on galaxy!