SERVS 2-band Catalog Definitions

Overview

The "Spitzer Extragalactic Representative Volume Survey" (SERVS) Exploration Science program conducted deep IRAC 3.6 and 4.5 micron observations of five extragalactic fields (ELAIS-N1, Lockman Hole, XMM, ELAIS-S1, and CDFS).

The 2-band high reliability catalogs are matched [3.6] and [4.5] catalogs, with the low coverage areas near the edges of the survey omitted (POLY_12=1). These catalogs should be used if you are using SERVS to select your sample, as objects in this catalog should be highly reliable (>99.9%). To appear in the catalog objects must appear in both bands, and the detection in one band must be > 10-sigma in CSNR, where CSNR is the coverage-weighted signal-to-noise ratio, described in Section 2.3.

Name Intype Units Description
NAME char Source name
ID long ID number
ra double degrees Right ascension (J2000)
dec double degrees Declination (J2000)
POLY int Combined high coverage polygon flag: 1 if POLY_1=1 or POLY_2=1, 0 otherwise
REL int Combined reliability flag: 1 if REL_1=1 or REL_2=1, 0 otherwise
ID_1 int ID number, 3.6 microns
RA_1 double degrees Right Ascension (J2000), 3.6 microns
DEC_1 double degrees Declination (J2000), 3.6 microns
FLUX_APER_1_1 double microJy Flux in 1.4" radius aperture, 3.6 microns
FLUX_APER_2_1 double microJy Flux in 1.9" radius aperture, 3.6 microns
FLUX_APER_3_1 double microJy Flux in 2.9" radius aperture, 3.6 microns
FLUX_APER_4_1 double microJy Flux in 4.9" radius aperture, 3.6 microns
FLUX_APER_5_1 double microJy Flux in 5.8" radius aperture, 3.6 microns
FLUXERR_APER_1_1 double microJy Flux error in 1.4" radius aperture, 3.6 microns
FLUXERR_APER_2_1 double microJy Flux error in 1.9" radius aperture, 3.6 microns
FLUXERR_APER_3_1 double microJy Flux error in 2.9" radius aperture, 3.6 microns
FLUXERR_APER_4_1 double microJy Flux error in 4.9" radius aperture, 3.6 microns
FLUXERR_APER_5_1 double microJy Flux error in 5.8" radius aperture, 3.6 microns
SNR_1_1 double Signal to noise ratio in 1.4" aperture, 3.6 microns
SNR_2_1 double Signal to noise ratio in 1.9" aperture, 3.6 microns
SNR_3_1 double Signal to noise ratio in 2.9" aperture, 3.6 microns
SNR_4_1 double Signal to noise ratio in 4.9" aperture, 3.6 microns
SNR_5_1 double Signal to noise ratio in 5.8" aperture, 3.6 microns
FLUX_ISO_1 double microJy Isophotal flux, 3.6 microns
FLUX_AUTO_1 double microJy Kron flux, 3.6 microns
FLUXERR_ISO_1 double microJy Uncertainty in FLUX_ISO_1
FLUXERR_AUTO_1 double microJy Uncertainty in FLUX_AUTO_1
SNR_ISO_1 double Signal to noise ratio for FLUX_ISO_1
SNR_AUTO_1 double Signal to noise ratio for FLUX_AUTO_1
KRON_RADIUS_1 float pixels Kron radius, 3.6 microns
CLASS_STAR_1 float Stellaricity, 3.6 microns
FLAGS_1 int Flags, 3.6 microns:
1 (Bit 0): The object has neighbors, bright and close enough to significantly bias the photometry, or bad pixels (more than 10% of the inte- grated area affected).
2 (Bit 1): The object was originally blended with another one.
4 (Bit 2): At least one pixel of the object is saturated (or very close to). Set using Table 3.
8 (Bit 3): The object is truncates (to close to an image boundary).
16 (Bit 4): Object's aperture data are incomplete or corrupted.
32 (Bit 5): Object's isophotal data are incomplete or corrupted.
MASK_1 int Mask, 3.6 microns:
1 (Bit 0): Overall data quality (set if poor)
2 (Bit 1): Set if pixel contains radhit
4 (Bit 2): Set if optical ghost present
8 (Bit 3): Set if stray light present
16 (Bit 4): Set if saturation donut
32 (Bit 5): Set if pixel contains latent image
64 (Bit 6): Set if pixel is saturated
128 (Bit 7): Set if column pulldown present
256 (Bit 8): Set if mosaic coverage <4 (added to the catalogs post-extraction)
512 (Bit 9): Set if bright star is present
COV_1 double Coverage of 100s frames, 3.6 microns
CSNR_1 double Coverage weighted SNR in aperture 2, 3.6 microns
POLY_1 int High coverage polygon flag, 3.6 microns: 1 if within high coverage polygon, 0 otherwise
REL_1 int Reliability flag, 3.6 microns: 1 if both CSNR>1 and POLY=1, otherwise 0
ID_2 int ID number, 4.5 microns
RA_2 double degrees Right Ascension (J2000), 4.5 microns
DEC_2 double degrees Declination (J2000), 4.5 microns
FLUX_APER_1_2 double microJy Flux in 1.4" radius aperture, 4.5 microns
FLUX_APER_2_2 double microJy Flux in 1.9" radius aperture, 4.5 microns
FLUX_APER_3_2 double microJy Flux in 2.9" radius aperture, 4.5 microns
FLUX_APER_4_2 double microJy Flux in 4.9" radius aperture, 4.5 microns
FLUX_APER_5_2 double microJy Flux in 5.8" radius aperture, 4.5 microns
FLUXERR_APER_1_2 double microJy Flux error in 1.4" radius aperture, 4.5 microns
FLUXERR_APER_2_2 double microJy Flux error in 1.9" radius aperture, 4.5 microns
FLUXERR_APER_3_2 double microJy Flux error in 2.9" radius aperture, 4.5 microns
FLUXERR_APER_4_2 double microJy Flux error in 4.9" radius aperture, 4.5 microns
FLUXERR_APER_5_2 double microJy Flux error in 5.8" radius aperture, 4.5 microns
SNR_1_2 double Signal to noise ratio in 1.4" aperture, 4.5 microns
SNR_2_2 double Signal to noise ratio in 1.9" aperture, 4.5 microns
SNR_3_2 double Signal to noise ratio in 2.9" aperture, 4.5 microns
SNR_4_2 double Signal to noise ratio in 4.9" aperture, 4.5 microns
SNR_5_2 double Signal to noise ratio in 5.8" aperture, 4.5 microns
FLUX_ISO_2 double microJy Isophotal flux, 4.5 microns
FLUX_AUTO_2 double microJy Kron flux, 4.5 microns
FLUXERR_ISO_2 double microJy Uncertainty in FLUX_ISO_2
FLUXERR_AUTO_2 double microJy Uncertainty in FLUX_AUTO_2
SNR_ISO_2 double Signal to noise ratio for FLUX_ISO_2
SNR_AUTO_2 double Signal to noise ratio for FLUX_AUTO_2
KRON_RADIUS_2 float pixels Kron radius, 4.5 microns
CLASS_STAR_2 float Stellaricity, 4.5 microns
FLAGS_2 int Flags, 4.5 microns:
1 (Bit 0): The object has neighbors, bright and close enough to significantly bias the photometry, or bad pixels (more than 10% of the inte- grated area affected).
2 (Bit 1): The object was originally blended with another one.
4 (Bit 2): At least one pixel of the object is saturated (or very close to). Set using Table 3.
8 (Bit 3): The object is truncates (to close to an image boundary).
16 (Bit 4): Object's aperture data are incomplete or corrupted.
32 (Bit 5): Object's isophotal data are incomplete or corrupted.
MASK_2 int Mask, 4.5 microns:
1 (Bit 0): Overall data quality (set if poor)
2 (Bit 1): Set if pixel contains radhit
4 (Bit 2): Set if optical ghost present
8 (Bit 3): Set if stray light present
16 (Bit 4): Set if saturation donut
32 (Bit 5): Set if pixel contains latent image
64 (Bit 6): Set if pixel is saturated
128 (Bit 7): Set if column pulldown present
256 (Bit 8): Set if mosaic coverage <4 (added to the catalogs post-extraction)
512 (Bit 9): Set if bright star is present
COV_2 double Coverage of 100s frames, 4.5 microns
CSNR_2 double Coverage weighted SNR in aperture 2, 4.5 microns
POLY_2 int High coverage polygon flag, 4.5 microns: 1 if within high coverage polygon, 0 otherwise
REL_2 int Reliability flag, 4.5 microns: 1 if both CSNR>1 and POLY=1, otherwise 0
Separation double arcsec Position difference between 3.6 and 4.5 microns