2FHL: THE SECOND CATALOG OF HARD FERMI-LAT SOURCES
Links to Fileshttps://iopscience.iop.org/article/10.3847/0067-0049/222/1/5
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Type of Work19 pages
Citation of Original PublicationM. Ackermann et al., 2FHL: THE SECOND CATALOG OF HARD FERMI-LAT SOURCES, The Astrophysical Journal Supplement Series, Volume 222, Number 1 (2016), doi:10.3847/0067-0049/222/1/5
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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 (~1farcm7 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.
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