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.
2FHL: THE SECOND CATALOG OF HARD FERMI-LAT SOURCES / Ackermann M; Ajello M; Atwood WB; Baldini L; Ballet J; Barbiellini G; Bastieri D; Gonzalez JB; Bellazzini R; Bissaldi E; Blandford RD; Bloom ED; Bonino R; Bottacini E; Brandt TJ; Bregeon J; Bruel P; Buehler R; Buson S; Caliandro GA; Cameron RA; Caputo R; Caragiulo M; Caraveo PA; Cavazzuti E; Cecchi C; Charles E; Chekhtman A; Cheung CC; Chiang J; Chiaro G; Ciprini S; Cohen JM; Cohen-Tanugi J; Cominsky LR; Conrad J; Cuoco A; Cutini S; DAmmando F; de Angelis A; de Palma F; Desiante R; Di Mauro M; Di Venere L; Dominguez A; Drell PS; Favuzzi C; Fegan SJ; Ferrara EC; Focke WB; Fortin P; Franckowiak A; Fukazawa Y; Funk S; Furniss AK; Fusco P; Gargano F; Gasparrini D; Giglietto N; Giommi P; Giordano F; Giroletti M; Glanzman T; Godfrey G; Grenier IA; Grondin MH; Guillemot L; Guiriec S; Harding AK; Hays E; Hewitt JW; Hill AB; Horan D; Iafrate G; Hartmann D; Jogler T; Johannesson G; Johnson AS; Kamae T; Kataoka J; Knodlseder J; Kuss M; La Mura G; Larsson S; Latronico L; Lemoine-Goumard M; Li J; Li L; Longo F; Loparco F; Lott B; Lovellette MN; Lubrano P; Madejski GM; Maldera S; Manfreda A; Mayer M; Mazziotta MN; Michelson PF; Mirabal N; Mitthumsiri W; Mizuno T; Moiseev AA; Monzani ME; Morselli A; Moskalenko IV; Murgia S; Nuss E; Ohsugi T; Omodei N; Orienti M; Orlando E; Ormes JF; Paneque D; Perkins JS; Pesce-Rollins M; Petrosian V; Piron F; Pivato G; Porter TA; Raino S; Rando R; Razzano M; Razzaque S; Reimer A; Reimer O; Reposeur T; Romani RW; Sanchez-Conde M; Parkinson PMS; Schmid J; Schulz A; Sgro C; Siskind EJ; Spada F; Spandre G; Spinelli P; Suson DJ; Tajima H; Takahashi H; Takahashi M; Takahashi T; Thayer JB; Thompson DJ; Tibaldo L; Torres DF; Tosti G; Troja E; Vianello G; Wood KS; Wood M; Yassine M; Zaharijas G; Zimmer S. - In: ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES. - ISSN 0067-0049. - STAMPA. - 222:1(2016), pp. 5.5-5.23. [10.3847/0067-0049/222/1/5]
2FHL: THE SECOND CATALOG OF HARD FERMI-LAT SOURCES
D'AMMANDO, FILIPPO;
2016
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
