COSMOS Zamojski Morphology Catalog v1.0
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:
- Spatial search on all images and small catalogs, using Atlas
- Advanced search on only the larger catalogs, using Gator
COSMOS Zamojski Morphology Catalog v1.0 Column Definitions
Gator serves the COSMOS Zamojski Morphology Catalog v1.0 (34 columns [29 delivered + 5 IRSA-created], 40,666 data rows). The column descriptions can be found below.
| Column Name | Data Type | Units | Description |
| ID | int | ID of the object in the 2005 release of the photometric catalog | |
| ra | float | degrees | Right Ascension (J2000), from the 2005 photometric catalog |
| dec | float | degrees | Declination (J2000), from the 2005 photometric catalog |
| x_image | float | pixels | position of the center of the object in image pixels |
| y_image | float | pixels | position of the center of the object in image pixels |
| i_mag_cat | float | Subaru I-band magnitude of the object from the 2005 photometric catalog | |
| bkg_avg | float | count/s | Value of the local background around the object |
| bkg_siv | float | counts/s | Dispersion in the local background |
| petro_r | float | pixels | Petrosian radius |
| petro_mu | float | counts/s/pix | Azimuthally averaged surface brightness at the petrosian radius |
| nker | int | Number of pixels in the smoothing kernel (circular tophat) | |
| npix | int | Number of pixels inside the segmentation map of the object | |
| flux | float | counts/s | Total flux inside the segmentation map |
| mag | float | Magnitude of the object converted from the above flux | |
| r20 | float | pixels | Radius containing 20% of the total flux |
| r50 | float | pixels | Radius containing 50% of the total flux |
| r80 | float | pixels | Radius containing 80% of the total flux |
| C | float | Concentration | |
| A | float | Asymmetry | |
| S | float | Clumpiness | |
| G | float | Gini coefficient | |
| M20 | float | M20 | |
| A_old | float | Asymmetry without sub-pixel recentering | |
| A_bkg | float | Asymmetry due to background (already subtracted in A and A_old) | |
| S_raw | float | Sum of all positive residuals of original-blurred image within the segmentation map | |
| S_bkg_1 | float | Clumpiness due to background as measured from one of four regions around the object | |
| S_bkg_2 | float | Second lowest value of the clumpiness of the background as measured from four regions around the object | |
| S_bkg_3 | float | Second highest value of the clumpiness of the background as measured from four regions around the object | |
| S_bkg_4 | float | Highest value of the clumpiness of the background as measured from four regions around the object |