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

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 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 < 10 14 Hz, about half of the BL Lacs have a synchrotron-peak frequency > 10 15 Hz. The 2LAC represents a significant improvement relative to the First LAT AGN Catalog (1LAC), with 52% more associated sources. Themore » 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.« less

Authors:
 [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); et al.
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
Fermi LAT Collaboration
OSTI Identifier:
1356777
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 743; Journal Issue: 2; Journal ID: ISSN 0004-637X
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Ackermann, M. The Second Catalog Of Active Galactic Nuclei Detected By The Fermi Large Area Telescope. United States: N. p., 2011. Web. doi:10.1088/0004-637X/743/2/171.
Ackermann, M. The Second Catalog Of Active Galactic Nuclei Detected By The Fermi Large Area Telescope. United States. doi:10.1088/0004-637X/743/2/171.
Ackermann, M. Fri . "The Second Catalog Of Active Galactic Nuclei Detected By The Fermi Large Area Telescope". United States. doi:10.1088/0004-637X/743/2/171. https://www.osti.gov/servlets/purl/1356777.
@article{osti_1356777,
title = {The Second Catalog Of Active Galactic Nuclei Detected By The Fermi Large Area Telescope},
author = {Ackermann, M.},
abstractNote = {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.},
doi = {10.1088/0004-637X/743/2/171},
journal = {Astrophysical Journal},
number = 2,
volume = 743,
place = {United States},
year = {2011},
month = {12}
}

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  • Wright, Alan E.; Griffith, Mark R.; Burke, B. F.
  • The Astrophysical Journal Supplement Series, Vol. 91
  • DOI: 10.1086/191939

The Parkes-MIT-NRAO (PMN) Surveys. VIII. Source Catalog for the Zenith Survey (-37.0 degrees < delta < -29.0 degrees )
journal, March 1996

  • Wright, Alan E.; Griffith, Mark R.; Hunt, Andrew J.
  • The Astrophysical Journal Supplement Series, Vol. 103
  • DOI: 10.1086/192272

Redshifts of Distant Blazars Limited by Fermi and VHE γ-Ray Observations
journal, August 2010

  • Yang, Jianping; Wang, Jiancheng
  • Publications of the Astronomical Society of Japan, Vol. 62, Issue 4
  • DOI: 10.1093/pasj/62.4.L23

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