2FHL: The SECOND CATALOG of HARD FERMI-LAT SOURCES

M. Ackermann; M. Ajello; W. B. Atwood; L. Baldini; J. Ballet; G. Barbiellini; D. Bastieri; J. Becerra Gonzalez; R. Bellazzini; E. Bissaldi; R. D. Blandford; E. D. Bloom; R. Bonino; E. Bottacini; T. J. Brandt; J. Bregeon; P. Bruel; R. Buehler; S. Buson; G. A. Caliandro; R. A. Cameron; R. Caputo; M. Caragiulo; P. A. Caraveo; E. Cavazzuti; C. Cecchi; E. Charles; A. Chekhtman; C. C. Cheung; J. Chiang; G. Chiaro; S. Ciprini; J. M. Cohen; J. Cohen-Tanugi; L. R. Cominsky; J. Conrad; A. Cuoco; S. Cutini; F. D'Ammando; A. De Angelis; F. De Palma; R. Desiante; M. Di Mauro; L. Di Venere; A. Domínguez; P. S. Drell; C. Favuzzi; S. J. Fegan; E. C. Ferrara; W. B. Focke; P. Fortin; A. Franckowiak; Y. Fukazawa; S. Funk; A. K. Furniss; P. Fusco; F. Gargano; D. Gasparrini; N. Giglietto; P. Giommi; F. Giordano; M. Giroletti; T. Glanzman; G. Godfrey; I. A. Grenier; M. H. Grondin; L. Guillemot; S. Guiriec; A. K. Harding; E. Hays; J. W. Hewitt; A. B. Hill; D. Horan; G. Iafrate; Dieter Hartmann; T. Jogler; G. Jóhannesson; A. S. Johnson; T. Kamae; J. Kataoka; J. Knödlseder; M. Kuss; G. La Mura; S. Larsson; L. Latronico; M. Lemoine-Goumard; J. Li; L. Li; F. Longo; F. Loparco; B. Lott; M. N. Lovellette; P. Lubrano; G. M. Madejski; S. Maldera; A. Manfreda; M. Mayer; M. N. Mazziotta; P. F. Michelson; N. Mirabal; W. Mitthumsiri; T. Mizuno; A. A. Moiseev; M. E. Monzani; A. Morselli; I. V. Moskalenko; S. Murgia; E. Nuss; T. Ohsugi; N. Omodei; M. Orienti; E. Orlando; J. F. Ormes; D. Paneque; J. S. Perkins; M. Pesce-Rollins; V. Petrosian; F. Piron; G. Pivato; T. A. Porter; S. Rainò; R. Rando; M. Razzano; S. Razzaque; A. Reimer; O. Reimer; T. Reposeur; R. W. Romani; M. Sánchez-Conde; P. M.Saz Parkinson; J. Schmid; A. Schulz; C. Sgrò; E. J. Siskind; F. Spada; G. Spandre; P. Spinelli; D. J. Suson; H. Tajima; H. Takahashi; M. Takahashi; T. Takahashi; J. B. Thayer; D. J. Thompson; L. Tibaldo; D. F. Torres; G. Tosti; E. Troja; G. Vianello; K. S. Wood; M. Wood; M. Yassine; G. Zaharijas; S. Zimmer

doi:10.3847/0067-0049/222/1/5

2FHL: The SECOND CATALOG of HARD FERMI-LAT SOURCES

M. Ackermann, M. Ajello, W. B. Atwood, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, J. Becerra Gonzalez, R. Bellazzini, E. Bissaldi, R. D. Blandford, E. D. Bloom, R. Bonino, E. Bottacini, T. J. Brandt, J. Bregeon, P. Bruel, R. Buehler, S. Buson, G. A. CaliandroR. A. Cameron, R. Caputo, M. Caragiulo, P. A. Caraveo, E. Cavazzuti, C. Cecchi, E. Charles, A. Chekhtman, C. C. Cheung, J. Chiang, G. Chiaro, S. Ciprini, J. M. Cohen, J. Cohen-Tanugi, L. R. Cominsky, J. Conrad, A. Cuoco, S. Cutini, F. D'Ammando, A. De Angelis, F. De Palma, R. Desiante, M. Di Mauro, L. Di Venere, A. Domínguez, P. S. Drell, C. Favuzzi, S. J. Fegan, E. C. Ferrara, W. B. Focke, P. Fortin, A. Franckowiak, Y. Fukazawa, S. Funk, A. K. Furniss, P. Fusco, F. Gargano, D. Gasparrini, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, M. H. Grondin, L. Guillemot, S. Guiriec, A. K. Harding, E. Hays, J. W. Hewitt, A. B. Hill, D. Horan, G. Iafrate, Dieter Hartmann, T. Jogler, G. Jóhannesson, A. S. Johnson, T. Kamae, J. Kataoka, J. Knödlseder, M. Kuss, G. La Mura, S. Larsson, L. Latronico, M. Lemoine-Goumard, J. Li, L. Li, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, G. M. Madejski, S. Maldera, A. Manfreda, M. Mayer, M. N. Mazziotta, P. F. Michelson, N. Mirabal, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, E. Nuss, T. Ohsugi, N. Omodei, M. Orienti, E. Orlando, J. F. Ormes, D. Paneque, J. S. Perkins, M. Pesce-Rollins, V. Petrosian, F. Piron, G. Pivato, T. A. Porter, S. Rainò, R. Rando, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, T. Reposeur, R. W. Romani, M. Sánchez-Conde, P. M.Saz Parkinson, J. Schmid, A. Schulz, C. Sgrò, E. J. Siskind, F. Spada, G. Spandre, P. Spinelli, D. J. Suson, H. Tajima, H. Takahashi, M. Takahashi, T. Takahashi, J. B. Thayer, D. J. Thompson, L. Tibaldo, D. F. Torres, G. Tosti, E. Troja, G. Vianello, K. S. Wood, M. Wood, M. Yassine, G. Zaharijas, S. Zimmer

Research output: Contribution to journal › Article › peer-review

219 Citations (Scopus)

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 (∼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.

Original language	English
Article number	5
Journal	Astrophysical Journal, Supplement Series
Volume	222
Issue number	1
DOIs	https://doi.org/10.3847/0067-0049/222/1/5
Publication status	Published - 2016 Jan

Keywords

catalogs
gamma-rays: general

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.3847/0067-0049/222/1/5

Cite this

Ackermann, M., Ajello, M., Atwood, W. B., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Gonzalez, J. B., Bellazzini, R., Bissaldi, E., Blandford, R. D., Bloom, E. D., Bonino, R., Bottacini, E., Brandt, T. J., Bregeon, J., Bruel, P., Buehler, R., Buson, S., ... Zimmer, S. (2016). 2FHL: The SECOND CATALOG of HARD FERMI-LAT SOURCES. Astrophysical Journal, Supplement Series, 222(1), [5]. https://doi.org/10.3847/0067-0049/222/1/5

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, D'Ammando, F, Angelis, AD, Palma, FD, Desiante, R, Mauro, MD, Venere, LD, Domínguez, 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, Jóhannesson, G, Johnson, AS, Kamae, T, Kataoka, J, Knödlseder, J, Kuss, M, Mura, GL, 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, Rainò, S, Rando, R, Razzano, M, Razzaque, S, Reimer, A, Reimer, O, Reposeur, T, Romani, RW, Sánchez-Conde, M, Parkinson, PMS, Schmid, J, Schulz, A, Sgrò, 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 2016, '2FHL: The SECOND CATALOG of HARD FERMI-LAT SOURCES', Astrophysical Journal, Supplement Series, vol. 222, no. 1, 5. https://doi.org/10.3847/0067-0049/222/1/5

@article{ff7dca6f5a9a4e128095c35ca1e39113,

title = "2FHL: The SECOND CATALOG of HARD FERMI-LAT SOURCES",

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 (∼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.",

keywords = "catalogs, gamma-rays: general",

author = "M. Ackermann and M. Ajello and Atwood, {W. B.} and L. Baldini and J. Ballet and G. Barbiellini and D. Bastieri and Gonzalez, {J. Becerra} and R. Bellazzini and E. Bissaldi and Blandford, {R. D.} and Bloom, {E. D.} and R. Bonino and E. Bottacini and Brandt, {T. J.} and J. Bregeon and P. Bruel and R. Buehler and S. Buson and Caliandro, {G. A.} and Cameron, {R. A.} and R. Caputo and M. Caragiulo and Caraveo, {P. A.} and E. Cavazzuti and C. Cecchi and E. Charles and A. Chekhtman and Cheung, {C. C.} and J. Chiang and G. Chiaro and S. Ciprini and Cohen, {J. M.} and J. Cohen-Tanugi and Cominsky, {L. R.} and J. Conrad and A. Cuoco and S. Cutini and F. D'Ammando and Angelis, {A. De} and Palma, {F. De} and R. Desiante and Mauro, {M. Di} and Venere, {L. Di} and A. Dom{\'i}nguez and Drell, {P. S.} and C. Favuzzi and Fegan, {S. J.} and Ferrara, {E. C.} and Focke, {W. B.} and P. Fortin and A. Franckowiak and Y. Fukazawa and S. Funk and Furniss, {A. K.} and P. Fusco and F. Gargano and D. Gasparrini and N. Giglietto and P. Giommi and F. Giordano and M. Giroletti and T. Glanzman and G. Godfrey and Grenier, {I. A.} and Grondin, {M. H.} and L. Guillemot and S. Guiriec and Harding, {A. K.} and E. Hays and Hewitt, {J. W.} and Hill, {A. B.} and D. Horan and G. Iafrate and Dieter Hartmann and T. Jogler and G. J{\'o}hannesson and Johnson, {A. S.} and T. Kamae and J. Kataoka and J. Kn{\"o}dlseder and M. Kuss and Mura, {G. La} and S. Larsson and L. Latronico and M. Lemoine-Goumard and J. Li and L. Li and F. Longo and F. Loparco and B. Lott and Lovellette, {M. N.} and P. Lubrano and Madejski, {G. M.} and S. Maldera and A. Manfreda and M. Mayer and Mazziotta, {M. N.} and Michelson, {P. F.} and N. Mirabal and W. Mitthumsiri and T. Mizuno and Moiseev, {A. A.} and Monzani, {M. E.} and A. Morselli and Moskalenko, {I. V.} and S. Murgia and E. Nuss and T. Ohsugi and N. Omodei and M. Orienti and E. Orlando and Ormes, {J. F.} and D. Paneque and Perkins, {J. S.} and M. Pesce-Rollins and V. Petrosian and F. Piron and G. Pivato and Porter, {T. A.} and S. Rain{\`o} and R. Rando and M. Razzano and S. Razzaque and A. Reimer and O. Reimer and T. Reposeur and Romani, {R. W.} and M. S{\'a}nchez-Conde and Parkinson, {P. M.Saz} and J. Schmid and A. Schulz and C. Sgr{\`o} and Siskind, {E. J.} and F. Spada and G. Spandre and P. Spinelli and Suson, {D. J.} and H. Tajima and H. Takahashi and M. Takahashi and T. Takahashi and Thayer, {J. B.} and Thompson, {D. J.} and L. Tibaldo and Torres, {D. F.} and G. Tosti and E. Troja and G. Vianello and Wood, {K. S.} and M. Wood and M. Yassine and G. Zaharijas and S. Zimmer",

note = "Funding Information: The Fermi LAT Collaboration acknowledges generous ongoing support from a number of agencies and institutes that have supported both the development and the operation of the LAT as well as scientific data analysis. These include the National Aeronautics and Space Administration and the Department of Energy in the United States, the Commissariat {\`a} l{\textquoteright}Energie Atomique and the Centre National de la Recherche Scientifique/Institut National de Physique Nucl{\'e}aire et de Physique des Particules in France, the Agenzia Spaziale Italiana and the Istituto Nazionale di Fisica Nucleare in Italy, the Ministry of Education, Culture, Sports, Science and Technology (MEXT), High Energy Accelerator Research Organization (KEK) and Japan Aerospace Exploration Agency (JAXA) in Japan, and the K.A.Wallenberg Foundation, the Swedish Research Council and the Swedish National Space Board in Sweden. Additional support for science analysis during the operations phase is gratefully acknowledged from the Istituto Nazionale di Astrofisica in Italy and the Centre National d{\textquoteright}{\'E}tudes Spatiales in France. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. Publisher Copyright: {\textcopyright} 2016. The American Astronomical Society. All rights reserved.",

year = "2016",

month = jan,

doi = "10.3847/0067-0049/222/1/5",

language = "English",

volume = "222",

journal = "Astrophysical Journal, Supplement Series",

issn = "0067-0049",

publisher = "IOP Publishing Ltd.",

number = "1",

}

TY - JOUR

T1 - 2FHL

T2 - The SECOND CATALOG of HARD FERMI-LAT SOURCES

AU - Ackermann, M.

AU - Ajello, M.

AU - Atwood, W. B.

AU - Baldini, L.

AU - Ballet, J.

AU - Barbiellini, G.

AU - Bastieri, D.

AU - Gonzalez, J. Becerra

AU - Bellazzini, R.

AU - Bissaldi, E.

AU - Blandford, R. D.

AU - Bloom, E. D.

AU - Bonino, R.

AU - Bottacini, E.

AU - Brandt, T. J.

AU - Bregeon, J.

AU - Bruel, P.

AU - Buehler, R.

AU - Buson, S.

AU - Caliandro, G. A.

AU - Cameron, R. A.

AU - Caputo, R.

AU - Caragiulo, M.

AU - Caraveo, P. A.

AU - Cavazzuti, E.

AU - Cecchi, C.

AU - Charles, E.

AU - Chekhtman, A.

AU - Cheung, C. C.

AU - Chiang, J.

AU - Chiaro, G.

AU - Ciprini, S.

AU - Cohen, J. M.

AU - Cohen-Tanugi, J.

AU - Cominsky, L. R.

AU - Conrad, J.

AU - Cuoco, A.

AU - Cutini, S.

AU - D'Ammando, F.

AU - Angelis, A. De

AU - Palma, F. De

AU - Desiante, R.

AU - Mauro, M. Di

AU - Venere, L. Di

AU - Domínguez, A.

AU - Drell, P. S.

AU - Favuzzi, C.

AU - Fegan, S. J.

AU - Ferrara, E. C.

AU - Focke, W. B.

AU - Fortin, P.

AU - Franckowiak, A.

AU - Fukazawa, Y.

AU - Funk, S.

AU - Furniss, A. K.

AU - Fusco, P.

AU - Gargano, F.

AU - Gasparrini, D.

AU - Giglietto, N.

AU - Giommi, P.

AU - Giordano, F.

AU - Giroletti, M.

AU - Glanzman, T.

AU - Godfrey, G.

AU - Grenier, I. A.

AU - Grondin, M. H.

AU - Guillemot, L.

AU - Guiriec, S.

AU - Harding, A. K.

AU - Hays, E.

AU - Hewitt, J. W.

AU - Hill, A. B.

AU - Horan, D.

AU - Iafrate, G.

AU - Hartmann, Dieter

AU - Jogler, T.

AU - Jóhannesson, G.

AU - Johnson, A. S.

AU - Kamae, T.

AU - Kataoka, J.

AU - Knödlseder, J.

AU - Kuss, M.

AU - Mura, G. La

AU - Larsson, S.

AU - Latronico, L.

AU - Lemoine-Goumard, M.

AU - Li, J.

AU - Li, L.

AU - Longo, F.

AU - Loparco, F.

AU - Lott, B.

AU - Lovellette, M. N.

AU - Lubrano, P.

AU - Madejski, G. M.

AU - Maldera, S.

AU - Manfreda, A.

AU - Mayer, M.

AU - Mazziotta, M. N.

AU - Michelson, P. F.

AU - Mirabal, N.

AU - Mitthumsiri, W.

AU - Mizuno, T.

AU - Moiseev, A. A.

AU - Monzani, M. E.

AU - Morselli, A.

AU - Moskalenko, I. V.

AU - Murgia, S.

AU - Nuss, E.

AU - Ohsugi, T.

AU - Omodei, N.

AU - Orienti, M.

AU - Orlando, E.

AU - Ormes, J. F.

AU - Paneque, D.

AU - Perkins, J. S.

AU - Pesce-Rollins, M.

AU - Petrosian, V.

AU - Piron, F.

AU - Pivato, G.

AU - Porter, T. A.

AU - Rainò, S.

AU - Rando, R.

AU - Razzano, M.

AU - Razzaque, S.

AU - Reimer, A.

AU - Reimer, O.

AU - Reposeur, T.

AU - Romani, R. W.

AU - Sánchez-Conde, M.

AU - Parkinson, P. M.Saz

AU - Schmid, J.

AU - Schulz, A.

AU - Sgrò, C.

AU - Siskind, E. J.

AU - Spada, F.

AU - Spandre, G.

AU - Spinelli, P.

AU - Suson, D. J.

AU - Tajima, H.

AU - Takahashi, H.

AU - Takahashi, M.

AU - Takahashi, T.

AU - Thayer, J. B.

AU - Thompson, D. J.

AU - Tibaldo, L.

AU - Torres, D. F.

AU - Tosti, G.

AU - Troja, E.

AU - Vianello, G.

AU - Wood, K. S.

AU - Wood, M.

AU - Yassine, M.

AU - Zaharijas, G.

AU - Zimmer, S.

N1 - Funding Information: The Fermi LAT Collaboration acknowledges generous ongoing support from a number of agencies and institutes that have supported both the development and the operation of the LAT as well as scientific data analysis. These include the National Aeronautics and Space Administration and the Department of Energy in the United States, the Commissariat à l’Energie Atomique and the Centre National de la Recherche Scientifique/Institut National de Physique Nucléaire et de Physique des Particules in France, the Agenzia Spaziale Italiana and the Istituto Nazionale di Fisica Nucleare in Italy, the Ministry of Education, Culture, Sports, Science and Technology (MEXT), High Energy Accelerator Research Organization (KEK) and Japan Aerospace Exploration Agency (JAXA) in Japan, and the K.A.Wallenberg Foundation, the Swedish Research Council and the Swedish National Space Board in Sweden. Additional support for science analysis during the operations phase is gratefully acknowledged from the Istituto Nazionale di Astrofisica in Italy and the Centre National d’Études Spatiales in France. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. Publisher Copyright: © 2016. The American Astronomical Society. All rights reserved.

PY - 2016/1

Y1 - 2016/1

N2 - 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.

AB - 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.

KW - catalogs

KW - gamma-rays: general

UR - http://www.scopus.com/inward/record.url?scp=84955482407&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84955482407&partnerID=8YFLogxK

U2 - 10.3847/0067-0049/222/1/5

DO - 10.3847/0067-0049/222/1/5

M3 - Article

AN - SCOPUS:84955482407

SN - 0067-0049

VL - 222

JO - Astrophysical Journal, Supplement Series

JF - Astrophysical Journal, Supplement Series

IS - 1

M1 - 5

ER -

2FHL: The SECOND CATALOG of HARD FERMI-LAT SOURCES

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