Eyeball quality checks

We have checked a number of images and spectra by eye, usually in pursuit of specific science goals (like low luminosity or high luminosity galaxies). We store the results in

$VAGC_REDUX/eyeball/quality.fits

which has the following columns:

OBJECT_POSITION: position of the object in the object_sdss_imaging file
QUALITY: a bitmask (described more fully below); do not use the object if any bit other than DONE is set, and in addition USE_ANYWAY or USE_PARENT are NOT set.

The bitmask values have the following meanings:

0 (DONE): we have checked this object
1 (OTHER): there is something wrong which doesn't fit any of the classes below
2 (UNCLASSIFIABLE): we can't determine whether or not something is wrong
3 (NEED_BIGGER_IMAGE): we looked at too small an image to figure out what is going on
4 (BAD_DEBLEND): ignore anything with this flagged unless USE_ANYWAY} or USE_PARENT} is set
5 (FLECK): this object has only a tiny bit of the total flux of the full object
6 (DOUBLE_STAR): a double star
7 (HII): an HII region plucked out of a larger galaxy
8 (USE_ANYWAY): there is a bad deblend, but we recommend you include the object in your sample anyway
9 (EDGE): something is wrong due to the object encountering an edge of a field
10 (SATELLITE): this object is actually a satellite flying overhead
11 (PLANE): this object is actuall a plane flying overhead
12 (BAD_Z): the listed redshift is wrong and the spectro outputs think it is right
13 (INTERNAL_REFLECTION): strongly affected by reflection inside the instrument
14 (BAD_SPEC_CLASS): the spectroscopic classification is wrong
15 (USE_PARENT): we recommend the parent object of this bad deblend, in the parents directory (but see BAD_PARENT_CENTER} below)
16 (IN_HUGE_OBJECT): even the parent of this object is part of something even bigger.
17 (STAR_ON_GALAXY): star sitting in the foreground of a distant galaxy (resulting in ``galaxy'' with very small redshift)
18 (QSO_ON_GALAXY): QSO in the background of a galaxy (resulting very high luminosity ``galaxy'')
19 (NEGATIVE_QSO_FIT): usually indicative of a redshift error.
20 (BAD_SPECTRUM): the spectrum itself is bad (for example, contaminated by scattered light from a nearby bright star)
21 (POSSIBLE_LENS): this object is possibly a multiply-imaged lens object
22 (IS_STAR): although classified as a resolved object, this is definitely a star
23 (DOUBLE_Z): the spectrum has two potential redshifts
24 (PLANETARY_NEBULA): the spectrum is actually that of a planetary nebula in the foreground
25 (BAD_PARENT_CENTER): the parent is centered in an odd place, which will probably confused structural measurements
26 (GOOD_Z): although the spectrum is flagged with a non-zero ZWARNING, the derived redshift is good

NYU Value-Added Galaxy Catalog