skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: 3FHL: The Third Catalog of Hard Fermi -LAT Sources

Abstract

We present a catalog of sources detected above 10 GeV by the Fermi Large Area Telescope (LAT) in the first 7 years of data using the Pass 8 event-level analysis. This is the Third Catalog of Hard Fermi -LAT Sources (3FHL), containing 1556 objects characterized in the 10 GeV–2 TeV energy range. The sensitivity and angular resolution are improved by factors of 3 and 2 relative to the previous LAT catalog at the same energies (1FHL). The vast majority of detected sources (79%) are associated with extragalactic counterparts at other wavelengths, including 16 sources located at very high redshift ( z > 2). Of the sources, 8% have Galactic counterparts and 13% are unassociated (or associated with a source of unknown nature). The high-latitude sky and the Galactic plane are observed with a flux sensitivity of 4.4 to 9.5 × 10{sup −11} ph cm{sup −2} s{sup −1}, respectively (this is approximately 0.5% and 1% of the Crab Nebula flux above 10 GeV). The catalog includes 214 new γ -ray sources. The substantial increase in the number of photons (more than 4 times relative to 1FHL and 10 times to 2FHL) also allows us to measure significant spectral curvature for 32 sources and find flux variabilitymore » for 163 of them. Furthermore, we estimate that for the same flux limit of 10{sup −12} erg cm{sup −2} s{sup −1}, the energy range above 10 GeV has twice as many sources as the range above 50 GeV, highlighting the importance, for future Cherenkov telescopes, of lowering the energy threshold as much as possible.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8]; ;  [9];  [10];  [11];  [12];
  1. Department of Physics and Astronomy, Clemson University, Kinard Lab of Physics, Clemson, SC 29634-0978 (United States)
  2. 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)
  3. Università di Pisa and Istituto Nazionale di Fisica Nucleare, Sezione di Pisa I-56127 Pisa (Italy)
  4. Laboratoire AIM, CEA-IRFU/CNRS/Université Paris Diderot, Service d’Astrophysique, CEA Saclay, F-91191 Gif sur Yvette (France)
  5. Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste (Italy)
  6. Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova (Italy)
  7. Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa (Italy)
  8. Dipartimento di Fisica “M. Merlin” dell’Università e del Politecnico di Bari, I-70126 Bari (Italy)
  9. 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)
  10. Istituto Nazionale di Fisica Nucleare, Sezione di Torino, I-10125 Torino (Italy)
  11. Laboratoire Univers et Particules de Montpellier, Université Montpellier, CNRS/IN2P3, F-34095 Montpellier (France)
  12. Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein 9300 (South Africa)
Publication Date:
OSTI Identifier:
22661088
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal, Supplement Series
Additional Journal Information:
Journal Volume: 232; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0067-0049
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CATALOGS; COSMIC GAMMA SOURCES; CRAB NEBULA; GAMMA RADIATION; GEV RANGE; MILKY WAY; RED SHIFT; RESOLUTION; SENSITIVITY; TELESCOPES; TEV RANGE; WAVELENGTHS

Citation Formats

Ajello, M., Atwood, W. B., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bellazzini, R., Bissaldi, E., Blandford, R. D., Bloom, E. D., Bonino, R., Bregeon, J., Britto, R. J., Bruel, P., E-mail: majello@slac.stanford.edu, and others, and. 3FHL: The Third Catalog of Hard Fermi -LAT Sources. United States: N. p., 2017. Web. doi:10.3847/1538-4365/AA8221.
Ajello, M., Atwood, W. B., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bellazzini, R., Bissaldi, E., Blandford, R. D., Bloom, E. D., Bonino, R., Bregeon, J., Britto, R. J., Bruel, P., E-mail: majello@slac.stanford.edu, & others, and. 3FHL: The Third Catalog of Hard Fermi -LAT Sources. United States. doi:10.3847/1538-4365/AA8221.
Ajello, M., Atwood, W. B., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bellazzini, R., Bissaldi, E., Blandford, R. D., Bloom, E. D., Bonino, R., Bregeon, J., Britto, R. J., Bruel, P., E-mail: majello@slac.stanford.edu, and others, and. Sun . "3FHL: The Third Catalog of Hard Fermi -LAT Sources". United States. doi:10.3847/1538-4365/AA8221.
@article{osti_22661088,
title = {3FHL: The Third Catalog of Hard Fermi -LAT Sources},
author = {Ajello, M. and Atwood, W. B. and Baldini, L. and Ballet, J. and Barbiellini, G. and Bastieri, D. and Bellazzini, R. and Bissaldi, E. and Blandford, R. D. and Bloom, E. D. and Bonino, R. and Bregeon, J. and Britto, R. J. and Bruel, P., E-mail: majello@slac.stanford.edu and others, and},
abstractNote = {We present a catalog of sources detected above 10 GeV by the Fermi Large Area Telescope (LAT) in the first 7 years of data using the Pass 8 event-level analysis. This is the Third Catalog of Hard Fermi -LAT Sources (3FHL), containing 1556 objects characterized in the 10 GeV–2 TeV energy range. The sensitivity and angular resolution are improved by factors of 3 and 2 relative to the previous LAT catalog at the same energies (1FHL). The vast majority of detected sources (79%) are associated with extragalactic counterparts at other wavelengths, including 16 sources located at very high redshift ( z > 2). Of the sources, 8% have Galactic counterparts and 13% are unassociated (or associated with a source of unknown nature). The high-latitude sky and the Galactic plane are observed with a flux sensitivity of 4.4 to 9.5 × 10{sup −11} ph cm{sup −2} s{sup −1}, respectively (this is approximately 0.5% and 1% of the Crab Nebula flux above 10 GeV). The catalog includes 214 new γ -ray sources. The substantial increase in the number of photons (more than 4 times relative to 1FHL and 10 times to 2FHL) also allows us to measure significant spectral curvature for 32 sources and find flux variability for 163 of them. Furthermore, we estimate that for the same flux limit of 10{sup −12} erg cm{sup −2} s{sup −1}, the energy range above 10 GeV has twice as many sources as the range above 50 GeV, highlighting the importance, for future Cherenkov telescopes, of lowering the energy threshold as much as possible.},
doi = {10.3847/1538-4365/AA8221},
journal = {Astrophysical Journal, Supplement Series},
issn = {0067-0049},
number = 2,
volume = 232,
place = {United States},
year = {2017},
month = {10}
}

Works referencing / citing this record:

3FHL: The Third Catalog of Hard Fermi -LAT Sources
text, January 2017


The first catalog of Fermi -LAT sources below 100 MeV
journal, October 2018


A MST catalogue of γ -ray source candidates above 10 GeV and at Galactic latitudes higher than 20°
journal, October 2018


A fast, very-high-energy γ -ray flare from BL Lacertae during a period of multi-wavelength activity in June 2015
journal, March 2019


Particle transport within the pulsar wind nebula HESS J1825–137
journal, January 2019


Monitoring and Multi-Messenger Astronomy with IceCube
journal, March 2019


Unbiased Long-Term Monitoring at TeV Energies
journal, April 2019


New blazar candidates from the 9Y-MST catalogue detected at energies higher than 10 GeV
journal, July 2019


Second AGILE catalogue of gamma-ray sources
journal, June 2019


The large gamma-ray flare of the flat-spectrum radio quasar PKS 0346−27
journal, July 2019


Extreme- and high-synchrotron-peaked blazars at the limit of Fermi-LAT detectability: the γ-ray spectrum of 1BIGB sources
journal, July 2018

  • Arsioli, B.; Barres de Almeida, U.; Prandini, E.
  • Monthly Notices of the Royal Astronomical Society, Vol. 480, Issue 2
  • DOI: 10.1093/mnras/sty1975

H.E.S.S. observations of the flaring gravitationally lensed galaxy PKS 1830–211
journal, April 2019

  • Abdalla, H.; Aharonian, F.; Ait Benkhali, F.
  • Monthly Notices of the Royal Astronomical Society, Vol. 486, Issue 3
  • DOI: 10.1093/mnras/stz1031

Investigation of Two Fermi -LAT Gamma-Ray Blazars Coincident with High-energy Neutrinos Detected by IceCube
journal, July 2019


Constraints on Gamma-Ray and Neutrino Emission from NGC 1068 with the MAGIC Telescopes
journal, September 2019

  • Acciari, V. A.; Ansoldi, S.; Antonelli, L. A.
  • The Astrophysical Journal, Vol. 883, Issue 2
  • DOI: 10.3847/1538-4357/ab3a51