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Gamma-ray blazars and active galactic nuclei seen by the Fermi-LAT

Published online by Cambridge University Press:  24 March 2015

B. Lott ,
E. Cavazzuti ,
S. Ciprini ,
S. Cutini  and
D. Gasparrini
B. Lott
Affiliation:
Centre d Etudes Nucléaires de Bordeaux Gradignan, CNRS/IN2P3, Université de Bordeaux, UMR 5797, Gradignan, 33175, France email: [email protected]
E. Cavazzuti
Affiliation:
Agenzia Spaziale Italiana (ASI) Science Data Center, I-00044 Frascati (Roma), Italy
S. Ciprini
Affiliation:
Agenzia Spaziale Italiana (ASI) Science Data Center, I-00044 Frascati (Roma), Italy
S. Cutini
Affiliation:
Agenzia Spaziale Italiana (ASI) Science Data Center, I-00044 Frascati (Roma), Italy
D. Gasparrini
Affiliation:
Agenzia Spaziale Italiana (ASI) Science Data Center, I-00044 Frascati (Roma), Italy
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Abstract

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The third catalog of active galactic nuclei (AGNs) detected by the Fermi-LAT (3LAC) is presented. It is based on the third Fermi-LAT catalog (3FGL) of sources detected with a test statistic (TS) greater than 25 using the first 4 years of data. The 3LAC includes 1591 AGNs located at high Galactic latitudes, |b| > 10 (with 28 duplicate associations, thus corresponding to 1563 gamma-ray sources among 2192 sources in the 3FGL catalog), a 71% increase over the second catalog based on 2 years of data. A very large majority of these AGNs (98%) are blazars. About half of the newly detected blazars are of unknown type, i.e., they lack spectroscopic information of sufficient quality to determine the strength of their emission lines. The general properties of the 3LAC sample confirm previous findings from earlier catalogs, but some new subclasses (e.g., intermediate- and high-synchrotron-peaked FSRQs) have now been significantly detected.

Keywords

gamma rays: observationsgalaxies: activegalaxies: jetsBL Lacertae objects: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S313: Extragalactic jets from every angle , September 2014 , pp. 12 - 16
Copyright
Copyright © International Astronomical Union 2015 

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