A Catalog of Bulge+Disk Decompositions and Updated Photometry for 1.12
  Million Galaxies in the Sloan Digital Sky Survey
  We perform two-dimensional, Point-Spread-Function-convolved, bulge+disk
decompositions in the $g$ and $r$ bandpasses on a sample of 1,123,718 galaxies
from the Legacy area of the Sloan Digital Sky Survey Data Release Seven. Four
different decomposition procedures are investigated which make improvements to
sky background determinations and object deblending over the standard SDSS
procedures that lead to more robust structural parameters and integrated galaxy
magnitudes and colors, especially in crowded environments. We use a set of
science-based quality assurance metrics namely the disk luminosity-size
relation, the galaxy color-magnitude diagram and the galaxy central (fiber)
colors to show the robustness of our structural parameters. The best procedure
utilizes simultaneous, two-bandpass decompositions. Bulge and disk photometric
errors remain below 0.1 mag down to bulge and disk magnitudes of $g \simeq 19$
and $r \simeq 18.5$. We also use and compare three different galaxy fitting
models: a pure Sersic model, a $n_b=4$ bulge + disk model and a Sersic (free
$n_b$) bulge + disk model. The most appropriate model for a given galaxy is
determined by the $F$-test probability. All three catalogs of measured
structural parameters, rest-frame magnitudes and colors are publicly released
here. These catalogs should provide an extensive comparison set for a wide
range of observational and theoretical studies of galaxies.
