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.