CGRABS - Candidate Gamma-Ray Blazar Survey Source Catalog
CGRaBS: An All-Sky Survey of Gamma-Ray Blazar Candidates Healey, Stephen E.; Romani, Roger W.; Cotter, Garret; Michelson, Peter F.; Schlafly, Edward F.; Readhead, Anthony C. S.; Giommi, Paolo; Chaty, Sylvain; Grenier, Isabelle A.; Weintraub, Lawrence C. =Astrophysical Journal Supplement Series, Volume 175, Issue 1, pp. 97-104. <2008ApJS..175...97H>
This parameter is a unique name identifying CGRaBS sources using the J2000.0 positional-based convention for names and the CGRaBS prefix, as registered with the CDS Dictionary of Nomenclature of Celestial Objects.
The Right Ascension of the radio source in the selected equinox. This was given in J2000 decimal degree coordinates and to a precision of 0.01 seconds of time in the original table.
The Declination of the radio source in the selected equinox. This was given in J2000 decimal degree coordinates and to a precision of 0.1 arcseconds in the original table.
The Galactic Longitude of the radio source.
The Galactic Latitude of the radio source.
The flux density of the radio source at 8.4 GHz, in mJy.
The figure of merit (FoM) of the radio source, being a measure of the combined probability that the radio source will be similar to those blazar sources detected as EGRET gamma-ray sources. This table contains only the best such sources having FoM > 0.04. This parameter is discussed in some detail in Section 2 of the reference paper.
This flag parameter is set to "X" to indicate that the source would not satisfy the FoM cutoff if its X-ray flux were ignored (see Section 2 of the reference paper).
This parameter is a limit flag for the R magnitude of the optical counterpart to the radio source.
The R-band magnitude of the optical counterpart to the radio source.
The nominal Galactic extinction in the R band in the direction of the radio source, derived from the Schlegel et al. (1998, ApJ, 500, 525) maps.
The source classification, derived as discussed in Section 3.2 of the reference paper, using the following abbreviations:
AGN - Active Galactic Nucleus (low-luminosity, broad-line blazar) BLL - BL Lac (continuum-dominated blazar) FSRQ - Flat spectrum radio quasar (luminous, broad-line blazar) GALAXY- Source with small line equivalent widths but large H/K break contrast NLRG - Narrow-line (< 1000 km/s) radio galaxy PN - Planetary nebula
The redshift of the optical counterpart to the radio source.
This flag parameter is set to ':' to indicate that there is some uncertainty in the quoted redshift value.
This parameter indicates the reference for the quoted redshift, as follows:
V - Veron Quasar Catalog (12th Edition) S - SDSS DR5 Quasar Catalog N - NED I - Simbad C - CGRaBS spectroscopy
The HEASARC Browse object classification, based on the value of the source_type parameter.