COSMOS Morphology Catalog Definitions

COSMOS Overview

The COSMOS Archive serves data taken for the Cosmic Evolution Survey (COSMOS) project. COSMOS is an astronomical survey designed to probe the formation and evolution of galaxies as a function of cosmic time (redshift) and large scale structural environment. The survey covers a 2 square degree equatorial field with imaging by most of the major space-based telescopes (Hubble, Spitzer, GALEX, XMM, Chandra) and a number of large ground based telescopes (Subaru, VLA, ESO-VLT, UKIRT, NOAO, CFHT, and others).

IRSA serves the COSMOS archive using the following search methods:

COSMOS Morphology Catalog Column Definitions

Gator serves the COSMOS 2005 Morphology Catalog (72 columns [67 delivered + 5 IRSA-created], 157,610 data rows). The column descriptions can be found below.

Column Name Data Type Units Description
ID int   ID number for the Morphology Catalog
oID int   ID number from the Capak et al. 2007 Optical Catalog
tile int   Image tile number
NUMBER int   ID Number within each image tile
X_IMAGE float pixel X pixel coordinate within each image tile
Y_IMAGE float pixel Y pixel coordinate within each image tile
XPEAK_IMAGE int pixel X pixel coordinate of the peak within each image tile
YPEAK_IMAGE int pixel Y pixel coordinate of the peak within each image tile
ra float deg Right Ascension (J2000)
dec float deg Declination (J2000)
A_IMAGE float pixel SExtractor semi-major axis measurement
B_IMAGE float pixel SExtractor semi-minor axis measurement
THETA_IMAGE float deg SExtractor Position Angle measurement
MAG_AUTO float mag SExtractor auto (total) manitude
MAGERR_AUTO float mag SExtractor auto (total) manitude error
ISO_MAG float mag SExtractor isophotal manitude
APER_MAGN float mag SExtractor aperture magnitude
FLUXCOUNTS float nJy SExtractor total flux counts
BACKGROUND float nJy SExtractor background counts
THRESHOLD float mag arcsec^-2 SExtractor isophotal threshold
SNR float   Total Signal-to-Noise ratio
MU_THRESHOLD float mag arcsec^-2 Isophotal surface brightness threshold
FLUX_MAX float nJy Peak flux
MU_MAX float mag Peak surface brightness
ISOAREA_IMG float pixel Isophotal area
AREA float pixel MORPHIOUS object area for morphological measurements
FLAGS float   SExtractor flags
CLASS_STAR float   SExtractor Star/Galaxy separator
SKY float nJy MORPHIOUS sky level
SKYRMS float nJy MORPHIOUS sky noise
MAJORAXIS float pixel MORPHIOUS semi-major axis measurement
MINORAXIS float pixel MORPHIOUS semi-minor axis measurement
AXISRATIO float   MORPHIOUS axis ratio determination
PHI float   MORPHIOUS position angle measurement
ASYMMETRY float   MORPHIOUS asymetry measurement
RAW_ASYMMETRY float   MORPHIOUS raw asymetry measurement
ASYM_SKY_COR float   MORPHIOUS sky asymetry correction
MU float mag MORPHIOUS surface brightness measurement
MU_CENTRAL float mag MORPHIOUS central surface brightness measurement
CON float   MORPHIOUS isophotal concentration
GINI float   MORPHIOUS isophotal Gini
HALFLIGHTRAD float pixel MORPHIOUS half light radius
QP_AF_1 float   MORPHIOUS Quasi-Petrosian Area Fraction eta=0.0001
QP_AF_2 float   MORPHIOUS Quasi-Petrosian Area Fraction eta=0.0002
QP_AF_3 float   MORPHIOUS Quasi-Petrosian Area Fraction eta=0.0003
QP_AF_4 float   MORPHIOUS Quasi-Petrosian Area Fraction eta=0.0004
QP_AF_5 float   MORPHIOUS Quasi-Petrosian Area Fraction eta=0.0005
QP_RADIUS_1 float pixel MORPHIOUS Quasi-Petrosian Radius eta=0.0001
QP_RADIUS_2 float pixel MORPHIOUS Quasi-Petrosian Radius eta=0.0002
QP_RADIUS_3 float pixel MORPHIOUS Quasi-Petrosian Radius eta=0.0003
QP_RADIUS_4 float pixel MORPHIOUS Quasi-Petrosian Radius eta=0.0004
QP_RADIUS_5 float pixel MORPHIOUS Quasi-Petrosian Radius eta=0.0005
QP_RF_1 float   MORPHIOUS Quasi-Petrosian Radius Fraction eta=0.0001
QP_RF_2 float   MORPHIOUS Quasi-Petrosian Radius Fraction eta=0.0002
QP_RF_3 float   MORPHIOUS Quasi-Petrosian Radius Fraction eta=0.0003
QP_RF_4 float   MORPHIOUS Quasi-Petrosian Radius Fraction eta=0.0004
QP_RF_5 float   MORPHIOUS Quasi-Petrosian Radius Fraction eta=0.0005
QP_GINI_1 float   MORPHIOUS Quasi-Petrosian Gini eta=0.0001
QP_GINI_2 float   MORPHIOUS Quasi-Petrosian Gini eta=0.0002
QP_GINI_3 float   MORPHIOUS Quasi-Petrosian Gini eta=0.0003
QP_GINI_4 float   MORPHIOUS Quasi-Petrosian Gini eta=0.0004
QP_GINI_5 float   MORPHIOUS Quasi-Petrosian Gini eta=0.0005
QP_CON_1 float   MORPHIOUS Quasi-Petrosian Concentration eta=0.0001
QP_CON_2 float   MORPHIOUS Quasi-Petrosian Concentration eta=0.0002
QP_CON_3 float   MORPHIOUS Quasi-Petrosian Concentration eta=0.0003
QP_CON_4 float   MORPHIOUS Quasi-Petrosian Concentration eta=0.0004
QP_CON_5 float   MORPHIOUS Quasi-Petrosian Concentration eta=0.0005