Description for file sdss-ukidss-sample.fits  (binary-format table)

Data selection and derived parameters are described in detail by
Baldry, Sullivan, Rani & Turner (2021) ui.adsabs.harvard.edu/abs/2021MNRAS.500.1557B/abstract
Title: Compact galaxies and the size-mass galaxy distribution from a colour-selected sample
at 0.04 < z < 0.15 supplemented by ugrizYJHK photometric redshifts.

These data, in the fits file, are restricted to 0.002 < z < 0.35 to give 231044 galaxies 
i.e. larger than the range used for the main results of the paper. 
In this range, the simple stellar mass estimates are approximately valid. 
Some visual cleaning has taken place but only for compact galaxies in the range 0.04 < z < 0.15.

To select sample of 164 compact galaxies highlighted in paper.
0.04 < z_cmb < 0.015 & logSig1pt5 > 10.5 & smass > 10.0

Columns:

OBJID        SDSS objid from DR14 query
RA           J2000 coordinate
DEC          J2000 coordinate
Z_CMB        CMB-frame redshift
ZETAERR      nominal error in ln(1+z), similar to Delta z/(1+z), see paper for photo-z method
TYPE         type=1 spec-z SDSS, type=2 spec-z 2MRS, type=3 photo-z (this paper)
R_PETRO      MW extinction-corrected Petro mag
R_CMODEL     MW extinction-corrected cmodelmag
I_CMODEL     MW extinction-corrected cmodelmag
SIZE_R       r-band half-light semi-major axis in arcsec (geometric mean of deV and exp profiles)
SIZE_I       i-band half-light semi-major axis in arcsec (geometric mean of deV and exp profiles)
SIZE_KPC     half-light semi-major in kpc, mean of r- and i- bands
MEAN_AB      axis ratio, mean of r- and i- bands
SMASS        log stellar mass, using simple observed g-i + i_cmodel formula, see paper
LOGSIG1PT5   log Sigma_{1.5} as per Barro et al. but using r_maj, see paper

MAG_{U,G,R,I,Z}  SDSS model magnitudes, scaled to a 1.4-arsec radius aperture using the i-band profile fits, 
                 MW extinction corrected, a value of 3 is used to indicate bad data.

MAG_{Y,J,H,K}    UKIDSS apermag4, 1.4-arsec radius aperture,
                 MW extinction corrected, converted to AB magnitudes, a value of 3 is used to indicate bad or missing data.