2FHL: THE SECOND CATALOG OF HARD FERMI-LAT SOURCES

By M. Ackermann, M. Ajello, W. Atwood, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, J. Gonzalez, R. Bellazzini, E. Bissaldi and 144 more. 2015

258 citations recorded by the source corpus.

We present a catalog of sources detected above 50 GeV by the Fermi-Large Area Telescope (LAT) in 80 months of data. The newly delivered Pass 8 event-level analysis allows the detection and characterization of sources in the 50 GeV–2 TeV energy range. In this energy band, Fermi-LAT has detected 360 sources, which constitute the second catalog of hard Fermi-LAT sources (2FHL). The improved angular resolution enables the precise localization of point sources (∼1.′7 radius at 68% C. L.) and the detection and characterization of spatially extended sources. We find that 86% of the sources can be associated with counterparts at other wavelengths, of which the majority (75%) are active galactic nuclei and the rest (11%) are Galactic sources. Only 25% of the 2FHL sources have been previously detected by Cherenkov telescopes, implying that the 2FHL provides a reservoir of candidates to be followed up at very high energies. This work closes the energy gap between the observations performed at GeV energies by Fermi-LAT on orbit and the observations performed at higher energies by Cherenkov telescopes from the ground.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/3dbce0bc42f497b4e4c3c2b4999299a6db21b2db

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In Nuclear and High Energy Physics

Citations in the corpus

Fermi Large Area Telescope Fourth Source Catalog (2019, methodology): “We used the improved model of the lunar emission (Ackermann et al. 2016a) and a data-based model of the solar disk and inverse-Compton scattering on the solar light (S. Raino 2019, private communication).”
The Search for Spatial Extension in High-latitude Sources Detected by the Fermi Large Area Telescope (2018, background): “3+04.5 (Ackermann et al. 2016a), and M31(Ackermann et al. 2017a).”
3FHL: The Third Catalog of Hard Fermi-LAT Sources (2017, background): “This is better than the 3.8 arcmin median location uncertainty (95% C.L.) of 2FHL (Ackermann et al. 2016b) thanks to the generally larger statistics existing at>10 GeV for 3FHL sources.”
An Indication of Anisotropy in Arrival Directions of Ultra-high-energy Cosmic Rays through Comparison to the Flux Pattern of Extragalactic Gamma-Ray Sources (2018, methodology): “We extract our list of gamma-ray AGNs (γAGNs hereafter) from the 2FHL catalog (Ackermann et al. 2016), which includes 360 sources detected by Fermi-LAT above 50 GeV.”
The 2HWC HAWC Observatory Gamma-Ray Catalog (2017, methodology): “…are also searched in the FermiLAT catalogs: the standard 2FGL and 3FGL catalogs (Abdo et al. 2010a; Nolan et al. 2012; Acero et al. 2015), the high energy 1FHL and 2FHL catalogs (Ackermann et al. 2013, 2016), the second pulsar catalogs (Abdo et al. 2013), and the SNR catalog (Acero et al. 2016).”
Multimessenger observations of a flaring blazar coincident with high-energy neutrino IceCube-170922A (2018, background): “TXS 0506+056 is a known Fermi-LAT g-ray source, appearing in three catalogs of Fermi sources (23, 24, 29) at energies above 0.”