paper

2FHL: The Second Catalog of Hard Fermi-LAT Sources

arXiv:1508.04449 · doi:10.3847/0067-0049/222/1/5

Abstract

We present a catalog of sources detected above 50 GeV by the {\it 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, {\it Fermi}-LAT has detected 360 sources, which constitute the second catalog of hard {\it 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 {\it Fermi}-LAT on orbit and the observations performed at higher energies by Cherenkov telescopes from the ground.

Submitted to ApJ. Contact authors: Marco Ajello, Alberto Domínguez, Jamie Cohen, Sara Cutini, Dario Gasparrini. The full catalog will be made available at the FSSC: http://fermi.gsfc.nasa.gov/ssc

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