The Second Catalog Of Active Galactic Nuclei Detected By The Fermi Large Area Telescope

Ackermann, M.

doi:10.1088/0004-637X/743/2/171

Title: The Second Catalog Of Active Galactic Nuclei Detected By The Fermi Large Area Telescope

Journal Article · Fri Dec 02 00:00:00 EST 2011 · The Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/743/2/171· OSTI ID:1356777

Ackermann, M. ^[1]

SLAC National Accelerator Lab., Menlo Park, CA (United States); et al.

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 γ-ray sources located at high Galactic latitudes (|b| > 10°) that are detected with a test statistic (TS) greater than 25 and associated statistically with AGNs. However some of these are affected by analysis issues and some are associated with multiple AGNs. Consequently we define a clean sample which includes 886 AGNs, comprising 395 BL Lacertae objects (BL Lacs), 310 flat-spectrum radio 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. Where possible, the blazars have been further classified based on their spectral energy distributions (SEDs) as archival radio, optical, and X-ray data permit. While almost all FSRQs have a synchrotron-peak frequency < 10¹⁴ Hz, about half of the BL Lacs have a synchrotron-peak frequency > 10¹⁵ Hz. The 2LAC represents a significant improvement relative to the First LAT AGN Catalog (1LAC), with 52% more associated sources. The full characterization of the newly detected sources will require more broad-band data. Various properties, such as γ-ray fluxes and photon power law spectral indices, redshifts, γ-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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: Fermi LAT Collaboration

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1356777

Journal Information:: The Astrophysical Journal, Vol. 743, Issue 2; ISSN 0004-637X

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 496 works

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The F-GAMMA program: Multi-frequency study of Active Galactic Nuclei in the Fermi era. Program description and the first 2.5 years of monitoring Fuhrmann, L.; Angelakis, E.; Zensus, J. A. arXiv https://doi.org/10.48550/arxiv.1608.02580	text	January 2016
Radio Follow-up on all Unassociated Gamma-ray Sources from the Third Fermi Large Area Telescope Source Catalog Schinzel, F. K.; Petrov, L.; Taylor, G. B. arXiv https://doi.org/10.48550/arxiv.1702.07036	text	January 2017
FSRQ/BL Lac dichotomy as the magnetized advective accretion process around black holes: a unified classification of blazars Mondal, Tushar; Mukhopadhyay, Banibrata arXiv https://doi.org/10.48550/arxiv.1904.05898	text	January 2019
A Broadband Spectro-polarimetric View of the NVSS Rotation Measure Catalogue II: Effects of Off-axis Instrumental Polarisation Ma, Yik Ki; Mao, S. A.; Stil, Jeroen arXiv https://doi.org/10.48550/arxiv.1905.04318	text	January 2019

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