SHELA IRAC Catalog Definitions
Overview
The Spitzer/HETDEX Exploratory Large-Area (SHELA) survey covers ~24 deg^2 of the Sloan Digital Sky Survey "Stripe 82" region, and falls within the footprints of the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) and the Dark Energy Survey. The images and catalogs are 80% (50%) complete to limiting magnitudes of 22.0 (22.6) AB mag in the detection image, which is constructed from the weighted sum of the IRAC 3.6 and 4.5 micron images. The catalogs reach limiting sensitivities of 1.1 microJy at both 3.6 and 4.5 microns (1sigma, for R = 2" circular apertures).
| Name |
Intype |
Units |
Description |
| ID |
int |
|
Object ID number |
| PIX_X |
double |
pixel |
X pixel coordinate |
| PIX_Y |
double |
pixel |
Y pixel coordinate |
| ra |
double |
deg |
Right Ascension (J2000) |
| dec |
double |
deg |
Declination (J2000) |
| ISOAREA |
double |
arcsec^2 |
Isophotal area in detection image |
| A |
double |
arcsec |
Semimajor axis in detection image |
| E |
double |
|
Ellipticity in detection image |
| THETA |
double |
deg |
Position angle in detection image |
| FLAGS3P6 |
int |
|
SExtractor flags in the 3.6 micron image |
| FLAGS4P5 |
int |
|
SExtractor flags in the 4.5 micron image |
| W3P6 |
double |
|
Value of the 3.6 micron weight map at the location of the object
The weight map values are proportional to the effective exposure time, with a constant of proportionality t_eff = 23.6*Weight. |
| W4P5 |
double |
|
Value of the 4.5 micron weight map at the location of the object
The weight map values are proportional to the effective exposure time, with a constant of proportionality t_eff = 23.6*Weight. |
| F3P6_ISO |
double |
microJy |
Isophotal flux in 3.6 micron image |
| F3P6ERR_ISO |
double |
microJy |
Uncertainty of F3P6_ISO |
| F3P6_AUTO |
double |
microJy |
Total (Kron) flux in 3.6 micron image |
| F3P6ERR_AUTO |
double |
microJy |
Uncertainty of F3P6_AUTO |
| F3P6_4ARCS |
double |
microJy |
3.6 micron flux measured in 4" diameter aperture, corrected to total |
| F3P6ERR_4ARCS |
double |
microJy |
Uncertainty of F3P6_4ARCS |
| F3P6_6ARCS |
double |
microJy |
3.6 micron flux measured in 6" diameter aperture, corrected to total |
| F3P6ERR_6ARCS |
double |
microJy |
Uncertainty of F3P6_6ARCS |
| F4P5_ISO |
double |
microJy |
Isophotal flux in 4.5 micron image |
| F4P5ERR_ISO |
double |
microJy |
Uncertainty of F4P5_ISO |
| F4P5_AUTO |
double |
microJy |
Total (Kron) flux in 4.5 micron image |
| F4P5ERR_AUTO |
double |
microJy |
Uncertainty of F4P5_AUTO |
| F4P5_4ARCS |
double |
microJy |
4.5 micron flux measured in 4" diameter aperture, corrected to total |
| F4P5ERR_4ARCS |
double |
microJy |
Uncertainty of F4P5_4ARCS |
| F4P5_6ARCS |
double |
microJy |
4.5 micron flux measured in 6" diameter aperture, corrected to total |
| F4P5ERR_6ARCS |
double |
microJy |
Uncertainty of F4P5_6ARCS |