Title

Resolving the Extragalactic γ-Ray Background above 50 GeV with the Fermi Large Area Telescope

Authors

M. Ackermann, Deutsches Elektronen Synchrotron DESY
M. Ajello, Department of Physics and Astronomy, Clemson University, Kinard Lab of Physics
A. Albert, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
W. B. Atwood, Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz
L. Baldini, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Università di Pisa and Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
J. Ballet, Laboratoire AIM, CEA-IRFU/CNRS/Université Paris Diderot, Service d'Astrophysique
G. Barbiellini, Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Dipartimento di Fisica, Università di Trieste
D. Bastieri, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Dipartimento di Fisica e Astronomia "G. Galilei", Università di Padova
K. Bechtol, Dept. of Physics and Wisconsin IceCube Particle Astrophysics Center, University of Wisconsin
R. Bellazzini, Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E. Bissaldi, Istituto Nazionale di Fisica Nucleare, Sezione di Bari
R. D. Blandford, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
E. D. Bloom, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
R. Bonino, Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Dipartimento di Fisica Generale "Amadeo Avogadro", Università degli Studi di Torino
J. Bregeon, Laboratoire Univers et Particules de Montpellier, Université Montpellier
R. J. Britto, Department of Physics, University of Johannesburg
P. Bruel, Laboratoire Leprince-Ringuet, École polytechnique
R. Buehler, Deutsches Elektronen Synchrotron DESY
G. A. Caliandro, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Consorzio Interuniversitario per la Fisica Spaziale (CIFS)
R. A. Cameron, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
M. Caragiulo, Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari
P. A. Caraveo, INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica
E. Cavazzuti, Agenzia Spaziale Italiana (ASI) Science Data Center
C. Cecchi, Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, Dipartimento di Fisica, Università degli Studi di Perugia
E. Charles, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
A. Chekhtman, College of Science, George Mason University, Naval Research Laboratory
J. Chiang, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
G. Chiaro, Dipartimento di Fisica e Astronomia "G. Galilei", Università di Padova
S. Ciprini, Agenzia Spaziale Italiana (ASI) Science Data Center, Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
J. Cohen-Tanugi, Laboratoire Univers et Particules de Montpellier, Université Montpellier
L. R. Cominsky, Department of Physics and Astronomy, Sonoma State University
F. Costanza, Istituto Nazionale di Fisica Nucleare, Sezione di Bari
S. Cutini, Agenzia Spaziale Italiana (ASI) Science Data Center, Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, INAF Osservatorio Astronomico di Roma
F. D’Ammando, INAF Istituto di Radioastronomia, Dipartimento di Astronomia, Università di Bologna
A. de Angelis, Dipartimento di Fisica, Università di Udine and Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Gruppo Collegato di Udine
F. de Palma, Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Università Telematica Pegaso, Piazza Trieste e Trento
R. Desiante, Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Università di Udine
S. W. Digel, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
M. Di Mauro, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
L. Di Venere, Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari
A. Domínguez, Department of Physics and Astronomy, Clemson University, Kinard Lab of Physics
P. S. Drell, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
C. Favuzzi, Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari
S. J. Fegan, Laboratoire Leprince-Ringuet, École polytechnique
E. C. Ferrara, NASA Goddard Space Flight Center
A. Franckowiak, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
Y. Fukazawa, Department of Physical Sciences, Hiroshima University
S. Funk, Erlangen Centre for Astroparticle Physics
P. Fusco, Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari
F. Gargano, Istituto Nazionale di Fisica Nucleare, Sezione di Bari
D. Gasparrini, Agenzia Spaziale Italiana (ASI) Science Data Center, Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
N. Giglietto, Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari
P. Giommi, Agenzia Spaziale Italiana (ASI) Science Data Center
F. Giordano, Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari
M. Giroletti, INAF Istituto di Radioastronomia
G. Godfrey, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
D. Green, NASA Goddard Space Flight Center, Department of Physics and Department of Astronomy, University of Maryland
I. A. Grenier, Laboratoire AIM, CEA-IRFU/CNRS/Université Paris Diderot, Service d'Astrophysique
S. Guiriec, NASA Goddard Space Flight Center, NASA Postdoctoral Program Fellow
E. Hays, NASA Goddard Space Flight Center
D. Horan, Laboratoire Leprince-Ringuet, École polytechnique
G. Iafrate, Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Osservatorio Astronomico di Trieste, Istituto Nazionale di Astrofisica
T. Jogler, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
G. Jóhannesson, Science Institute, University of Iceland
M. Kuss, Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
G. La Mura, Dipartimento di Fisica e Astronomia "G. Galilei", Università di Padova, Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari
S. Larsson, Department of Physics, KTH Royal Institute of Technology, The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova
L. Latronico, Istituto Nazionale di Fisica Nucleare, Sezione di Torino
J. Li, Institute of Space Sciences (IEEC-CSIC)
L. Li, Department of Physics, KTH Royal Institute of Technology, The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova
F. Longo, Istituto Nazionale di Fisica Nucleare, Sezione di Trieste,Dipartimento di Fisica, Università di Trieste
F. Loparco, Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari
B. Lott, Centre d'Études Nucléaires de Bordeaux Gradignan, IN2P3/CNRS, Université Bordeaux
M. N. Lovellette, Space Science Division, Naval Research Laboratory
P. Lubrano, Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, Dipartimento di Fisica, Università degli Studi di Perugia
G. M. Madejski, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
J. Magill, Department of Physics and Department of Astronomy, University of Maryland
S. Maldera, Istituto Nazionale di Fisica Nucleare, Sezione di Torino
A. Manfreda, Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
M. Mayer, Deutsches Elektronen Synchrotron DESY
M. N. Mazziotta, Istituto Nazionale di Fisica Nucleare, Sezione di Bari
P. F. Michelson, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
W. Mitthumsiri, Department of Physics, Faculty of Science, Mahidol University
T. Mizuno, Hiroshima Astrophysical Science Center, Hiroshima University
A. A. Moiseev, Department of Physics and Department of Astronomy, University of Maryland, Center for Research and Exploration in Space Science and Technology (CRESST) and NASA Goddard Space Flight Center
M. E. Monzani, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
A. Morselli, Istituto Nazionale di Fisica Nucleare, Sezione di Roma "Tor Vergata"
I. V. Moskalenko, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
S. Murgia, Center for Cosmology, Physics and Astronomy Department, University of California
M. Negro, Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Dipartimento di Fisica Generale "Amadeo Avogadro", Università degli Studi di Torino
E. Nuss, Laboratoire Univers et Particules de Montpellier, Université Montpellier
T. Ohsugi, Hiroshima Astrophysical Science Center, Hiroshima University
C. Okada, Department of Physical Sciences, Hiroshima University
N. Omodei, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
E. Orlando, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
J. F. Ormes, University of DenverFollow
D. Paneque, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Max-Planck-Institut für Physik
J. S. Perkins, NASA Goddard Space Flight Center
M. Pesce-Rollins, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
V. Petrosian, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
F. Piron, Laboratoire Univers et Particules de Montpellier, Université Montpellier
G. Pivato, Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
T. A. Porter, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
S. Rainò, Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari
R. Rando, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Dipartimento di Fisica e Astronomia "G. Galilei", Università di Padova
M. Razzano, Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, Funded by contract FIRB-2012-RBFR12PM1F from the Italian Ministry of Education, University and Research (MIUR)
S. Razzaque, Department of Physics, University of Johannesburg
A. Reimer, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, nstitut für Astro- und Teilchenphysik and Institut für Theoretische Physik, Leopold-Franzens-Universität Innsbruck
O. Reimer, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, nstitut für Astro- und Teilchenphysik and Institut für Theoretische Physik, Leopold-Franzens-Universität Innsbruck
T. Reposeur, Centre d'Études Nucléaires de Bordeaux Gradignan, IN2P3/CNRS, Université Bordeaux
R. W. Romani, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
M. Sánchez-Conde, The Oskar Klein Centre for Cosmoparticle Physics, Department of Physics, Stockholm University, AlbaNova
J. Schmid, Laboratoire AIM, CEA-IRFU/CNRS/Université Paris Diderot, Service d'Astrophysique
A. Schulz, Deutsches Elektronen Synchrotron DESY
C. Sgrò, Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
D. Simone, Istituto Nazionale di Fisica Nucleare, Sezione di Bari
E. J. Siskind, NYCB Real-Time Computing Inc.
F. Spada, Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
G. Spandre, Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
P. Spinelli, Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari
D. J. Suson, Department of Chemistry and Physics, Purdue University Calumet
H. Takahashi, Department of Physical Sciences, Hiroshima University
J. B. Thayer, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
L. Tibaldo, Max-Planck-Institut für Kernphysik
D. F. Torres, Institute of Space Sciences (IEEC-CSIC), Institució Catalana de Recerca i Estudis Avançats (ICREA)
E. Troja, NASA Goddard Space Flight Center, Department of Physics and Department of Astronomy, University of Maryland
G. Vianello, W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University
M. Yassine, Laboratoire Univers et Particules de Montpellier, Université Montpellier
S. Zimmer, The Oskar Klein Centre for Cosmoparticle Physics, Department of Physics, Stockholm University, AlbaNova

Document Type

Article

Publication Date

4-14-2016

Compass Link

https://du-primo.hosted.exlibrisgroup.com/permalink/f/1jii0mc/TN_cdi_osti_scitechconnect_1355687

Organizational Units

College of Natual Science and Mathematics, Physics and Astronomy

Abstract

The Fermi Large Area Telescope (LAT) Collaboration has recently released a catalog of 360 sources detected above 50 GeV (2FHL). This catalog was obtained using 80 months of data re-processed with Pass 8, the newest event-level analysis, which significantly improves the acceptance and angular resolution of the instrument. Most of the 2FHL sources at high Galactic latitude are blazars. Using detailed Monte Carlo simulations, we measure, for the first time, the source count distribution, dN/dS, of extragalactic γ-ray sources at E>50  GeV and find that it is compatible with a Euclidean distribution down to the lowest measured source flux in the 2FHL (∼8×10-12  ph cm-2 s-1). We employ a one-point photon fluctuation analysis to constrain the behavior of dN/dS below the source detection threshold. Overall, the source count distribution is constrained over three decades in flux and found compatible with a broken power law with a break flux, Sb, in the range [8×10-12,1.5×10-11]  ph cm-2 s-1 and power-law indices below and above the break of α2∈[1.60,1.75] and α1=2.49±0.12, respectively. Integration of dN/dS shows that point sources account for at least 86-14+16% of the total extragalactic γ-ray background. The simple form of the derived source count distribution is consistent with a single population (i.e., blazars) dominating the source counts to the minimum flux explored by this analysis. We estimate the density of sources detectable in blind surveys that will be performed in the coming years by the Cherenkov Telescope Array.

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