M31 IRAC Catalog Definitions

Overview

IRAC Observations of the Extended Disk and Halo of M31 (M31 IRAC) covers the major and minor axes of M31 with total lengths of 6.6 and 4.4 degrees, respectively. The M31 IRAC Catalog includes 426,529 sources.

If you use M31IRAC data, please cite Rafiei Ravandi et al. (2016).

Name Intype Units Description
ID char Object name
Object_ID int Running object number
KRON_RADIUS double Kron apertures in units of A or B
A_IMAGE double pixel Profile RMS along major axis
X_IMAGE double pixel Object position along x
Y_IMAGE double pixel Object position along y
X_WORLD double deg Barycenter position along world x axis
Y_WORLD double deg Barycenter position along world y axis
ra double deg Right ascension of barycenter (J2000)
dec double deg Declination of barycenter (J2000)
ELLIPTICITY double Ellipticity (1-B_IMAGE/A_Image)
FWHM_WORLD double deg FWHM assuming a gaussian core
CLASS_STAR double Star/galaxy classification: Values close to 0 are likely to be galaxies and values close to 1 are likely to be stars.
FLAGS float Extraction flags
MAG_AUTO_I1 double mag 3.6 micron Kron-like elliptical aperture magnitude
MAGGERR_AUTO_I1 double mag RMS error for MAG_AUTO_I1
MAG_APER1_I1 double mag 3.6 micron 3 arcsec aperture magnitude
MAGGERR_APER1_I1 double mag RMS error for MAG_APER1_I1
MAG_APER2_I1 double mag 3.6 micron 4 arcsec aperture magnitude
MAGGERR_APER2_I1 double mag RMS error for MAG_APER2_I1
MAG_APER3_I1 double mag 3.6 micron 5 arcsec aperture magnitude
MAGGERR_APER3_I1 double mag RMS error for MAG_APER3_I1
MAG_APER4_I1 double mag 3.6 micron 6 arcsec aperture magnitude
MAGGERR_APER4_I1 double mag RMS error for MAG_APER4_I1
MAG_APER5_I1 double mag 3.6 micron 12 arcsec aperture magnitude
MAGGERR_APER5_I1 double mag RMS error for MAG_APER5_I1
MAG_ISO_I1 double mag 3.6 micron isophotal magnitude
MAGERR_ISO_I1 double mag RMS error for MAG_ISO_I1
MAG_ISOCOR_I1 double mag 3.6 micron corrected isophotal magnitude
MAGERR_ISOCOR_I1 double mag RMS error for MAG_ISOCOR_I1
FLUX_AUTO_I1 double uJy 3.6 micron Kron-like elliptical aperture flux
FLUXERR_AUTO_I1 double uJy RMS error for FLUX_AUTO_I1
FLUX_APER1_I1 double uJy 3.6 micron 3 arcsec aperture flux
FLUXERR_APER1_I1 double uJy RMS error for FLUX_APER1_I1
FLUX_APER2_I1 double uJy 3.6 micron 4 arcsec aperture flux
FLUXERR_AUTO2_I1 double uJy RMS error for FLUX_APER2_I1
FLUX_APER3_I1 double uJy 3.6 micron 5 arcsec aperture flux
FLUXERR_APER3_I1 double uJy RMS error for FLUX_APER3_I1
FLUX_APER4_I1 double uJy 3.6 micron 6 arcsec aperture flux
FLUXERR_APER4_I1 double uJy RMS error for FLUX_APER4_I1
FLUX_APER5_I1 double uJy 3.6 micron 12 arcsec aperture flux
FLUXERR_APER5_I1 double uJy RMS error for FLUX_APER5_I1
FLUX_ISO_I1 double uJy 3.6 micron isophotal flux
FLUXERR_ISO_I1 double uJy RMS error for FLUX_ISO_I1
FLUX_ISOCOR_I1 double uJy 3.6 micron corrected isophotal flux
FLUXERR_ISOCOR_I1 double uJy RMS error for FLUX_ISOCOR_I1
MAG_AUTO_I2 double mag 4.5 micron Kron-like elliptical aperture magnitude
MAGGERR_AUTO_I2 double mag RMS error for MAG_AUTO_I2
MAG_APER1_I2 double mag 4.5 micron 3 arcsec aperture magnitude
MAGGERR_APER1_I2 double mag RMS error for MAG_APER1_I2
MAG_APER2_I2 double mag 4.5 micron 4 arcsec aperture magnitude
MAGGERR_APER2_I2 double mag RMS error for MAG_APER2_I2
MAG_APER3_I2 double mag 4.5 micron 5 arcsec aperture magnitude
MAGGERR_APER3_I2 double mag RMS error for MAG_APER3_I2
MAG_APER4_I2 double mag 4.5 micron 6 arcsec aperture magnitude
MAGGERR_APER4_I2 double mag RMS error for MAG_APER4_I2
MAG_APER5_I2 double mag 4.5 micron 12 arcsec aperture magnitude
MAGGERR_APER5_I2 double mag RMS error for MAG_APER5_I2
MAG_ISO_I2 double mag 4.5 micron isophotal aperture magnitude
MAGERR_ISO_I2 double mag RMS error for MAG_ISO_I2
MAG_ISOCOR_I2 double mag 4.5 micron corrected isophotal aperture magnitude
MAGERR_ISOCOR_I2 double mag RMS error for MAG_ISOCOR_I2
FLUX_AUTO_I2 double uJy 4.5 micron Kron-like elliptical aperture flux
FLUXERR_AUTO_I2 double uJy RMS error for FLUX_AUTO_I2
FLUX_APER1_I2 double uJy 4.5 micron 3 arcsec aperture flux
FLUXERR_APER1_I2 double uJy RMS error for FLUX_APER1_I2
FLUX_APER2_I2 double uJy 4.5 micron 4 arcsec aperture flux
FLUXERR_APER2_I2 double uJy RMS error for FLUX_APER2_I2
FLUX_APER3_I2 double uJy 4.5 micron 5 arcsec aperture flux
FLUXERR_APER3_I2 double uJy RMS error for FLUX_APER3_I2
FLUX_APER4_I2 double uJy 4.5 micron 6 arcsec aperture flux
FLUXERR_APER4_I2 double uJy RMS error for FLUX_APER4_I2
FLUX_APER5_I2 double uJy 4.5 micron 12 arcsec aperture flux
FLUXERR_APER5_I2 double uJy RMS error for FLUX_APER5_I2
FLUX_ISO_I2 double uJy 4.5 micron isophotal flux
FLUXERR_ISO_I2 double uJy RMS error for FLUX_ISO_I2
FLUX_ISOCOR_I2 double uJy 4.5 micron corrected isophotal flux
FLUXERR_ISOCOR_I2 double uJy RMS error for FLUX_ISOCOR_I2
P_M31 double Probability for being M31 object
N_ROBUST double Robust count = P_M31/Completeness
R_PROJ double arcmin Projected galactocentric distance
R_DEPROJ double arcmin Deprojected galactocentric distance