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Title: FERMI LARGE AREA TELESCOPE SECOND SOURCE CATALOG

Abstract

We present the second catalog of high-energy {gamma}-ray sources detected by the Large Area Telescope (LAT), the primary science instrument on the Fermi Gamma-ray Space Telescope (Fermi), derived from data taken during the first 24 months of the science phase of the mission, which began on 2008 August 4. Source detection is based on the average flux over the 24 month period. The second Fermi-LAT catalog (2FGL) includes source location regions, defined in terms of elliptical fits to the 95% confidence regions and spectral fits in terms of power-law, exponentially cutoff power-law, or log-normal forms. Also included are flux measurements in five energy bands and light curves on monthly intervals for each source. Twelve sources in the catalog are modeled as spatially extended. We provide a detailed comparison of the results from this catalog with those from the first Fermi-LAT catalog (1FGL). Although the diffuse Galactic and isotropic models used in the 2FGL analysis are improved compared to the 1FGL catalog, we attach caution flags to 162 of the sources to indicate possible confusion with residual imperfections in the diffuse model. The 2FGL catalog contains 1873 sources detected and characterized in the 100 MeV to 100 GeV range of whichmore » we consider 127 as being firmly identified and 1171 as being reliably associated with counterparts of known or likely {gamma}-ray-producing source classes.« less

Authors:
; ; ; ; ; ;  [1];  [2];  [3]; ;  [4]; ;  [5];  [6]; ;  [7];  [8];  [9];  [10];  [11] more »; « less
  1. W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States)
  2. Center for Earth Observing and Space Research, College of Science, George Mason University, Fairfax, VA 22030 (United States)
  3. Deutsches Elektronen Synchrotron DESY, D-15738 Zeuthen (Germany)
  4. Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia (Italy)
  5. Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064 (United States)
  6. Department of Astronomy, Stockholm University, SE-106 91 Stockholm (Sweden)
  7. Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa (Italy)
  8. Laboratoire AIM, CEA-IRFU/CNRS/Universite Paris Diderot, Service d'Astrophysique, CEA Saclay, 91191 Gif sur Yvette (France)
  9. Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste (Italy)
  10. Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova (Italy)
  11. Istituto Universitario di Studi Superiori (IUSS), I-27100 Pavia (Italy)
Publication Date:
OSTI Identifier:
22047910
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal, Supplement Series; Journal Volume: 199; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; CATALOGS; COMPARATIVE EVALUATIONS; COSMIC GAMMA SOURCES; GAMMA ASTRONOMY; GAMMA DETECTION; GEV RANGE; MEV RANGE; SPACE

Citation Formats

Nolan, P. L., Ajello, M., Allafort, A., Bechtol, K., Berenji, B., Blandford, R. D., Bloom, E. D., Abdo, A. A., Ackermann, M., Antolini, E., Bonamente, E., Atwood, W. B., Belfiore, A., Axelsson, M., Baldini, L., Bellazzini, R., Ballet, J., Barbiellini, G., Bastieri, D., Bignami, G. F., E-mail: digel@stanford.edu, E-mail: Gino.Tosti@pg.infn.it, E-mail: jean.ballet@cea.fr, E-mail: tburnett@u.washington.edu, and and others. FERMI LARGE AREA TELESCOPE SECOND SOURCE CATALOG. United States: N. p., 2012. Web. doi:10.1088/0067-0049/199/2/31.
Nolan, P. L., Ajello, M., Allafort, A., Bechtol, K., Berenji, B., Blandford, R. D., Bloom, E. D., Abdo, A. A., Ackermann, M., Antolini, E., Bonamente, E., Atwood, W. B., Belfiore, A., Axelsson, M., Baldini, L., Bellazzini, R., Ballet, J., Barbiellini, G., Bastieri, D., Bignami, G. F., E-mail: digel@stanford.edu, E-mail: Gino.Tosti@pg.infn.it, E-mail: jean.ballet@cea.fr, E-mail: tburnett@u.washington.edu, & and others. FERMI LARGE AREA TELESCOPE SECOND SOURCE CATALOG. United States. doi:10.1088/0067-0049/199/2/31.
Nolan, P. L., Ajello, M., Allafort, A., Bechtol, K., Berenji, B., Blandford, R. D., Bloom, E. D., Abdo, A. A., Ackermann, M., Antolini, E., Bonamente, E., Atwood, W. B., Belfiore, A., Axelsson, M., Baldini, L., Bellazzini, R., Ballet, J., Barbiellini, G., Bastieri, D., Bignami, G. F., E-mail: digel@stanford.edu, E-mail: Gino.Tosti@pg.infn.it, E-mail: jean.ballet@cea.fr, E-mail: tburnett@u.washington.edu, and and others. Sun . "FERMI LARGE AREA TELESCOPE SECOND SOURCE CATALOG". United States. doi:10.1088/0067-0049/199/2/31.
@article{osti_22047910,
title = {FERMI LARGE AREA TELESCOPE SECOND SOURCE CATALOG},
author = {Nolan, P. L. and Ajello, M. and Allafort, A. and Bechtol, K. and Berenji, B. and Blandford, R. D. and Bloom, E. D. and Abdo, A. A. and Ackermann, M. and Antolini, E. and Bonamente, E. and Atwood, W. B. and Belfiore, A. and Axelsson, M. and Baldini, L. and Bellazzini, R. and Ballet, J. and Barbiellini, G. and Bastieri, D. and Bignami, G. F., E-mail: digel@stanford.edu, E-mail: Gino.Tosti@pg.infn.it, E-mail: jean.ballet@cea.fr, E-mail: tburnett@u.washington.edu and and others},
abstractNote = {We present the second catalog of high-energy {gamma}-ray sources detected by the Large Area Telescope (LAT), the primary science instrument on the Fermi Gamma-ray Space Telescope (Fermi), derived from data taken during the first 24 months of the science phase of the mission, which began on 2008 August 4. Source detection is based on the average flux over the 24 month period. The second Fermi-LAT catalog (2FGL) includes source location regions, defined in terms of elliptical fits to the 95% confidence regions and spectral fits in terms of power-law, exponentially cutoff power-law, or log-normal forms. Also included are flux measurements in five energy bands and light curves on monthly intervals for each source. Twelve sources in the catalog are modeled as spatially extended. We provide a detailed comparison of the results from this catalog with those from the first Fermi-LAT catalog (1FGL). Although the diffuse Galactic and isotropic models used in the 2FGL analysis are improved compared to the 1FGL catalog, we attach caution flags to 162 of the sources to indicate possible confusion with residual imperfections in the diffuse model. The 2FGL catalog contains 1873 sources detected and characterized in the 100 MeV to 100 GeV range of which we consider 127 as being firmly identified and 1171 as being reliably associated with counterparts of known or likely {gamma}-ray-producing source classes.},
doi = {10.1088/0067-0049/199/2/31},
journal = {Astrophysical Journal, Supplement Series},
number = 2,
volume = 199,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2012},
month = {Sun Apr 01 00:00:00 EDT 2012}
}