THE ORIGIN OF THE EXTRAGALACTIC GAMMA-RAY BACKGROUND AND IMPLICATIONS FOR DARK MATTER ANNIHILATION

被引：190

作者：

Ajello, M. ^{[1
]}

Gasparrini, D. ^{[2
,3
]}

Sanchez-Conde, M. ^{[4
,5
,6
,7
]}

Zaharijas, G. ^{[8
,9
,10
,11
]}

Gustafsson, M. ^{[12
,13
]}

Cohen-Tanugi, J. ^{[14
]}

Dermer, C. D. ^{[15
]}

Inoue, Y. ^{[16
]}

Hartmann, D. ^{[1
]}

Ackermann, M. ^{[17
]}

Bechtol, K. ^{[18
]}

Franckowiak, A. ^{[4
,5
]}

Reimer, A. ^{[19
,20
]}

Romani, R. W. ^{[4
,5
]}

Strong, A. W. ^{[21
]}

机构：

[1] Clemson Univ, Dept Phys & Astron, Kinard Lab Phys, Clemson, SC 29634 USA

[2] Agenzia Spaziale Italiana ASI, Sci Data Ctr, I-00133 Rome, Italy

[3] Osserv Astron Roma, INAF, I-00040 Rome, Italy

[4] Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

[5] Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

[6] Stockholm Univ, Dept Phys, AlbaNova, SE-10691 Stockholm, Sweden

[7] AlbaNova, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden

[8] Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy

[9] Univ Trieste, I-34127 Trieste, Italy

[10] Abdus Salam Int Ctr Theoret Phys, I-34151 Trieste, Italy

[11] Univ Nova Gorica, Lab Astroparticle Phys, SI-5000 Nova Gorica, Slovenia

[12] ULB, Serv Phys Theor, B-1050 Brussels, Belgium

[13] Inst Theoret Phys, D-37077 Gottingen, Germany

[14] Univ Montpellier 2, Lab Univers & Particules Montpellier, CNRS, IN2P3, Montpellier, France

[15] Naval Res Lab, Div Space Sci, Washington, DC 20375 USA

[16] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Chuo Ku, Sagamihara, Kanagawa 2525210, Japan

[17] Deutsch Elektronen Synchrotron DESY, D-15738 Zeuthen, Germany

[18] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA

[19] Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria

[20] Leopold Franzens Univ Innsbruck, Inst Theoret Phys, A-6020 Innsbruck, Austria

[21] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2015年 / 800卷 / 02期

基金：

美国国家科学基金会;

关键词：

cosmology: observations; dark matter; galaxies: active; galaxies: jets; gamma rays: diffuse background; surveys; LARGE-AREA TELESCOPE; STAR-FORMING GALAXIES; COSMIC MEV; EMISSION; CATALOG; SIGNAL; ANISOTROPIES; RADIATION; SPECTRUM; OBJECTS;

D O I：

10.1088/2041-8205/800/2/L27

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The origin of the extragalactic.-ray background (EGB) has been debated for some time. The EGB comprises the.-ray emission from resolved and unresolved extragalactic sources, such as blazars, star-forming galaxies, and radio galaxies, as well as radiation from truly diffuse processes. This Letter focuses on the blazar source class, the most numerous detected population, and presents an updated luminosity function and spectral energy distribution model consistent with the blazar observations performed by the Fermi-Large Area Telescope (LAT). We show that blazars account for 50(-11)(+12)% of the EGB photons (>0.1 GeV), and that Fermi-LAT has already resolved similar to 70% of this contribution. Blazars, and in particular hard-spectrum sources such as BL Lacs, are responsible for most of the EGB emission above 100 GeV. We find that the extragalactic background light, which attenuates blazars' high-energy emission, is responsible for the high-energy cutoff observed in the EGB spectrum. Finally, we show that blazars, star-forming galaxies, and radio galaxies can naturally account for the amplitude and spectral shape of the background in the 0.1-820 GeV range, leaving only modest room for other contributions. This allows us to set competitive constraints on the dark matter annihilation cross section.

引用

页数：7

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