The
2MASS Extended Source Catalog (XSC)
is catalog of resolved sources from the
2MASS project,
comprised of mostly galaxies located in the nearby Universe (z < 0.2).
Radial velocity redshifts exist for a significant fraction (~30%; see
statistic summary, link below)
of the XSC, most notably for the bright end of catalog (K < 11.5 mag).
Photometric redshifts are derived from the NIR colors and K-band integrated flux
using the prescription described in
Jarrett 2004, with results given in
Photometric Redshifts.
A small subset (~1000 galaxies) have well determined distances based on cepheid
variables, surface brightness fluctuations, tip of the red-giant sequence and
Tully-Fisher, as compiled by Barry Madore and
NED.
These distance estimates are incorporated into the XSC to form
a "redshift" catalog that covers the entire sky down to complete redshifts of
z~0.09 (for L* and K=14 mag) and to depths exceeding z~0.2 for luminous galaxies.
The XSCz is described in this document, including results of the photometric redshift
calibration; see the links below.
