FERMILAC - Fermi LAT Second AGN Catalog
It was updated in May 2012 to contain the Second LAT AGN Catalog, representing a combination of Tables 3, 4, 7, and 8 of the Ackermann et al. 2011 paper. Data were obtained from the 2LAC database hosted by the Agenzia Spazial Italiano Science Data Center (ASDC) at http://www.asdc.asi.it/fermi2lac/.
The source designation, 2FGL JHHMM.m+DDMM, constructed according to the IAU Specifications for Nomenclature, in which the Right Ascension and Declination have been truncated to 0.1 decimal minutes and 1', respectively. The '2' refers to the second catalog and 'FGL' represents Fermi Gamma-ray LAT.
The designation of the associated AGN, as taken from one of the following astronomical catalogs:
CRATES Combined Radio All-sky Targeted Eight GHz Survey (Healey et al. 2007) CGRaBS Candidate Gamma-Ray Blazar Survey (Healey et al. 2008) BZn Roma-BZCAT (Massaro et al. 2009) NGC New General Catalog (Dreyer 1887) PKS Parkes Radio Sources Catalogue (Wright A.E. and Otrupcek R. 1990) RX ROSAT (Bade et al. 1992) CLASS Cosmic Lens All-Sky Survey (Myers et al. 2003; Browne et al. 2003) FRBA Sources observed at 8.4 GHz as part of VLA program AH996 1WGA Catalog of ROSAT PSPC Sources (White, Giommi and Angelini 1995) 4C 4th Cambridge Survey (Pilkington and Scott P F 1965; Gower, Scott and Wills 1967) CXOMP ChandraX-ray Observatory Multiwavelength Project (Kim et al. 2004) M Messier (1782) B2,3 Second, Third Bologna Survey (Colla et al. 1970; Ficarra et al. 1985) Oa Ohio Survey (Scheer & Kraus 1967; Rinsland et al. 1975) Ton Tonanzintla Observatory Survey (Chavira 1958) 1ES Einstein Slew Survey (Elvis et al. 1992) TX Texas Survey (Douglas et al. 1996) Mkn Markarian (1967) SDSS Sloan Digital Sky Survey CXOCY Chandra X-ray Observatory, Calan Yale (Castander et al., 2003) ESO European Southern Observatory (Lauberts and Valentijn 1989) 2E Second Einstein IPC Survey PG Palomar Observatory Green Survey (Green et al., 1986)
The Right Ascension of the associated AGN.
The Declination of the associated AGN.
The Galactic Longitude of the associated AGN.
the Galactic Latitude of the associated AGN.
The angular separation, in degrees, between the 2FGL source position and the position of the associated AGN.
The error in the source position, in degrees, calculated from the geometric mean of the semi-major and semi-minor axes of the gamma-ray 95%-confidence region.
The optical classification of the AGN, as follows:
AGN = Active galactic nucleus AGU = Active galaxy of uncertain type BL Lac = BL Lacertae object FSRQ = Flat-spectrum radio quasar Radio Galaxy = Active galaxy that is very luminous at radio wavelengths SSRQ = Steep-spectrum radio quasar Starbust Galaxy = Galaxy with an exceptionally high rate of star formation Unindentified = No classification determined
The classification of the AGN spectral energy distribution, based on the synchrotron peak frequency, as follows:
LSP = low-synchrotron-peaked (sources with peak frequency < 1014 Hz) ISP = intermediate-synchrotron-peaked (1014 Hz < peak frequency < 1015 Hz) HSP = high-synchrotron-peaked (sources with peak frequency > 1015 Hz)
The redshift of the AGN.
The Bayesian probability of the source association.
The reliability of the likelihood ratio for radio/gamma association.
The reliability of the likelihood ratio for X-ray/gamma association.
The log(N)-log(S) probability of the source association.
The likelihood ratio for radio/gamma association.
The likelihood ratio for X-ray/gamma association.
The photon flux, in units of photons/cm2/s in the 1-100 GeV band.
The 1-sigma uncertainty for the photon flux, in units of photons/cm2/s, in the 1-100 GeV band.
The photon number spectral index.
The 1-sigma uncertainty for the photon spectral index.
The test statistic for detection. This is approximately equal to sigma2.
The radio flux desnsity, in mJy. These are obtained mainly from the GB6 (Gregory et al. 1996) and PMN catalogs and are at 4.85 GHz (6 cm).
This is the X-ray flux, in erg s-1 cm-2. The X-ray fluxes are derived from the ROSAT All Sky Survey (RASS) (Voges et al. 1999), Swift X-Ray Telescope, White-Giommi-Angelini (White et al. 2000), XMM (XMM-Newton Survey Science Centre 2010), and Brera Multi-scale Wavelet (Lazzati et al. 2001) catalogs. RAS, White-Giommi-Angelini & the Brera Multi-Scale wavelet catalogs are in the 0.2-2.4 keV band; XMM & Swift are in the 0.5-12 keV band (approximately).
The V magnitude from the USNO-B1 catalog.
The V magnitude from the SDSS.
The multi-frequency spectral index between the radio and optical bands.
The multi-frequency spectral index between the optical and X-ray bands.
The flag 'Y' indicates that the source is in the clean sample; 'N' otherwise.
The flag 'Y' indicates that the source is in the 2FGL catalog; 'N' otherwise.