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2FHL: THE SECOND CATALOG OF HARD FERMI-LAT SOURCES
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2016 (English)In: Astrophysical Journal Supplement Series, ISSN 0067-0049, E-ISSN 1538-4365, Vol. 222, no 1, 5Article in journal (Refereed) PublishedText
Abstract [en]

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 (similar to 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.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2016. Vol. 222, no 1, 5
Keyword [en]
catalogs, gamma-rays: general
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-182790DOI: 10.3847/0067-0049/222/1/5ISI: 000368982300005ScopusID: 2-s2.0-84955482407OAI: oai:DiVA.org:kth-182790DiVA: diva2:906145
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QC 20160223

Available from: 2016-02-23 Created: 2016-02-23 Last updated: 2016-02-23Bibliographically approved

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