ISOGAL PSC Catalog Definitions

Overview

The ISOGAL survey is one of the largest imaging programme performed by the ISO satellite. About 16 sq. deg. mainly distributed in the inner Galactic disk were mapped at 7 and/or 15 micron. Because of highly structured background and high source density, a special point source extraction algorithm was used and resulted in a 100000 point source catalogue. The mid-infrared data have been associated with near-infrared DENIS sources, providing an up to five wavelength photometric catalogue with a typical astrometric accuracy better than 1 arcsecond. The point source catalogue contains the positional and photometric parameters of all ISOGAL sources, together with various quality flags aimed at giving an estimate of the reliability of the detections and of the associations between the different bands.

For more information, see the ReadMe.

If you use ISOGAL data, please cite both the journal article Schuller et al. (2003) and the dataset Digital Object Identifier (DOI): 10.26131/IRSA618.

Name Intype Units Description
Seq char Source identification number in the field
Name char Source identifier
ra double deg Right Ascension (J2000)
dec double deg Declination (J2000)
ra_iso double deg ISOGAL Right Ascension (J2000)
dec_iso double deg ISOGAL Declination (J2000)
glon double deg Galactic longitude
glat double deg Galactic latitude
Ifield char ISOGAL field name
Dfield long DENIS field name
Imag double mag DENIS I-band magnitude
Icor double DENIS I-band correlation factor
Ixpos double pixel X-position in DENIS I-band
Iypos double pixel Y-position in DENIS I-band
Jmag double mag DENIS J-band magnitude
Jcor double DENIS J-band correlation factor
Jxpos double pixel X-position in DENIS J-band
Jypos double pixel Y-position in DENIS J-band
Kmag double mag DENIS Ks-band magnitude
Kcor double DENIS Ks-band correlation factor
Kxpos double pixel X-position in DENIS Ks-band
Kypos double pixel Y-position in DENIS Ks-band
mag7 double mag ISO/LW2 ISOGAL 7um magnitude
e_mag7 double mag Uncertainty in 7um magnitude
filt7 int LW number of filter used at 7 micron
pfov7 int arcsec Pixel field of view at 7 micron
xpos7 double pixel X-position on ISOGAL final 7 micron image
ypos7 double pixel Y-position on ISOGAL final 7 micron image
npix7 int Npix flag at 7 micron: good values in the range 2-4.
mesh7 int Mesh flag at 7 micron: 1 for sources detected only with mesh = 1; 2 for sources detected only with mesh = 2; 3 for sources associated between the two extractions.
edge7 int Edge flag at 7 micron: 1 when the center of the source is 2-5 pixels from the edge of the observed raster; 0 when the distances is greater than 5 pixels.
qual7 int Global quality flag at 7 micron: 4 = very good photometric quality; 3 = reasonably good quality; 2 = moderate quality.
mag15 double mag ISO/LW3 ISOGAL 15um magnitude
e_mag15 double mag Uncertainty in 15um magnitude
filt15 int LW number of filter used at 15 micron
pfov15 int arcsec Pixel field of view at 15 micron
xpos15 double pixel X-position on ISOGAL final 15 micron image
ypos15 double pixel Y-position on ISOGAL final 15 micron image
npix15 int Npix flag at 15 micron: good values in the range 2-4.
mesh15 int Mesh flag at 15 micron: 1 for sources detected only with mesh = 1; 2 for sources detected only with mesh = 2; 3 for sources associated between the two extractions.
edge15 int Edge flag at 15 micron: 1 when the center of the source is 2-5 pixels from the edge of the observed raster; 0 when the distances is greater than 5 pixels.
qual15 int Global quality flag at 15 micron: 4 = very good photometric quality; 3 = reasonably good quality; 2 = moderate quality.
disII double arcsec Distance 7 to 15 micron associated sources
assII int 7-15 micron association quality flag: 4 = separation < 1 pixel and there is only one possible association within 2 pixels; 3 = separation < 1 pixel with another possible association within 2 pixels; 2 = separation 1-2 pixels, no other source within 2 pixels; 1 = separation 1-2 pixels, at least two sources within 2 pixels.
disID double arcsec Distance ISOGAL to DENIS associated sources
assID int ISOGAL-DENIS association quality flag: 5 = highest quality; 0 = no association.