The Fermi Second Large Area Telescope AGN Catalog (2LAC)

The second LAT AGN catalog (2LAC; arXiv 1108.1420) is based on the first two years of scientific data from the Fermi Gamma ray Space Telescope. It consists of 1016 high Galactic latitude (|b|>10 degrees) sources with Test Statistic > 25 that are associated at high confidence with AGNs. The 2LAC clean sample comprises 885 sources which have unique associations and were not flagged as suspicious during the analysis, and includes 395 BL Lac objects, 310 flat spectrum radio quasars, 156 blazars of unknown type, 8 misaligned AGNs, 4 RL-NLSy1 galaxies, 10 AGNs of other types, and 2 starburst galaxies. More than 55% of the BL Lac objects do not have measured redshifts. The importance of this catalog to various topics in blazar research is summarized, including the blazar sequence, unification between beamed and misaligned AGN populations, variability and population studies, and the radio/gamma-ray and GeV/TeV connections.