The Second LAT AGN Catalogue from the Fermi observatory
Author(s)
Date Issued
2011-01-01
Mission(s)
Abstract
The second catalog of active galactic nuclei (AGNs) detected by the Fermi Large Area Telescope
(LAT) in two years of scientific operation is presented. The Second LAT AGN Catalog (2LAC)
includes 1017 g -ray sources located at high Galactic latitudes (abs(b) > 10deg) that are detected
with a test statistic (TS) greater than 25 and associated statistically with AGNs. Consequently
we define a Clean sample which includes 886 AGNs, comprising 395 BL Lacertae objects (BL
Lacs), 310 flat-spectrumradio quasars (FSRQs), 157 candidate blazars of unknown type (i.e., with
broad-band blazar characteristics but with no optical spectral measurement yet), eight misaligned
AGNs, four narrow-line Seyfert 1 (NLS1s), 10 AGNs of other types and two starburst galaxies.
The full characterization of the newly detected sources will require more broad-band data.
Various properties, such as g -ray fluxes and photon power law spectral indices, redshifts, g -ray
luminosities, variability, and archival radio luminosities and their correlations are presented and
discussed for the different blazar classes. The general trends observed in 1LAC are confirmed.
(LAT) in two years of scientific operation is presented. The Second LAT AGN Catalog (2LAC)
includes 1017 g -ray sources located at high Galactic latitudes (abs(b) > 10deg) that are detected
with a test statistic (TS) greater than 25 and associated statistically with AGNs. Consequently
we define a Clean sample which includes 886 AGNs, comprising 395 BL Lacertae objects (BL
Lacs), 310 flat-spectrumradio quasars (FSRQs), 157 candidate blazars of unknown type (i.e., with
broad-band blazar characteristics but with no optical spectral measurement yet), eight misaligned
AGNs, four narrow-line Seyfert 1 (NLS1s), 10 AGNs of other types and two starburst galaxies.
The full characterization of the newly detected sources will require more broad-band data.
Various properties, such as g -ray fluxes and photon power law spectral indices, redshifts, g -ray
luminosities, variability, and archival radio luminosities and their correlations are presented and
discussed for the different blazar classes. The general trends observed in 1LAC are confirmed.