Speaker
Description
Preliminary results of the fourth catalog of active galactic nuclei (AGNs, 4LAC) detected in gamma rays by the Fermi Large Area Telescope (LAT) in seven years of scientific operation are presented. This catalog will be similar to the previously released third LAT AGN catalog (3LAC). The 4LAC includes approximately 2500 gamma-ray sources located at high Galactic latitudes (|b| > 10°) that are detected with a test statistic (TS) greater than 25 and are statistically associated with AGNs. The 4LAC contains many new objects, and most of them are of unknown type and lack spectroscopic information of sufficient quality to determine the strength of their emission lines. Various gamma-ray properties and their correlations are presented and discussed for the different blazar classes. The trends observed in previous catalogs are confirmed. We will present some of the novelties arising in the 4LAC.
