Anisotropies in the diffuse gamma-ray background measured by the Fermi-LAT

被引：1

作者：

Cuoco, A. ^{[2
]}

Linden, T. ^{[3
]}

Mazziotta, M. N. ^{[4
]}

Siegal-Gaskins, J. M. ^{[5
]}

Vitale, Vincenzo ^{[1
]}

Komatsu, E. ^{[6
,7
]}

机构：

[1] Ist Nazl Fis Nucl, Sez Tor Vergata, I-00133 Rome, Italy

[2] Stockholm Univ, Oskar Klein Ctr, AlbaNova Univ Ctr, SE-10691 Stockholm, Sweden

[3] Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA

[4] Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy

[5] CALTECH, Pasadena, CA 91125 USA

[6] Univ Texas Austin, Dept Astron, Austin, TX 78712 USA

[7] Univ Texas Austin, Texas Cosmol Ctr, Austin, TX 78712 USA

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2012年 / 692卷

关键词：

gamma rays; Dark matter; Isotropic gamma-ray background; Extra-galactic gamma-ray background;

D O I：

10.1016/j.nima.2011.12.093

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The small angular scale fluctuations of the (on large scale) isotropic gamma-ray background (IGRB) carry information about the presence of unresolved source classes. A guaranteed contribution to the IGRB is expected from the unresolved gamma-ray AGN while other extragalactic sources, Galactic gamma-ray source populations and dark matter Galactic and extragalactic structures (and substructures) are candidate contributors. The IGRB was measured with unprecedented precision by the Large Area Telescope (LAT) on-board of the Fermi gamma-ray observatory, and these data were used for measuring the IGRB angular power spectrum (APS). Detailed Monte Carlo simulations of Fermi-LAT all-sky observations were performed to provide a reference against which to compare the results obtained for the real data set. The Monte Carlo simulations are also a method for performing those detailed studies of the APS contributions of single source populations, which are required in order to identify the actual IGRB contributors. We present preliminary results of an anisotropy search in the IGRB. At angular scales <2 degrees (e.g., above multipole 155), angular power above the photon noise level is detected, at energies between 1 and 10 GeV in each energy bin, with statistical significance between 7.2 and 4.1 sigma. The obtained energy dependences point to the presence of one or more unclustered source populations with the components having an average photon index Gamma = 2.40 +/- 0.07. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：127 / 131

页数：5

共 36 条

[1] THE FERMI-LAT HIGH-LATITUDE SURVEY: SOURCE COUNT DISTRIBUTIONS AND THE ORIGIN OF THE EXTRAGALACTIC DIFFUSE BACKGROUND [J].

Abdo, A. A. ;

Ackermann, M. ;

Ajello, M. ;

Antolini, E. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Bastieri, D. ;

Baughman, B. M. ;

Bechtol, K. ;

Bellazzini, R. ;

Berenji, B. ;

Blandford, R. D. ;

Bloom, E. D. ;

Bonamente, E. ;

Borgland, A. W. ;

Bouvier, A. ;

Bregeon, J. ;

Brez, A. ;

Brigida, M. ;

Bruel, P. ;

Burnett, T. H. ;

Buson, S. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caraveo, P. A. ;

Carrigan, S. ;

Casandjian, J. M. ;

Cavazzuti, E. ;

Cecchi, C. ;

Celik, Oe ;

Charles, E. ;

Chekhtman, A. ;

Cheung, C. C. ;

Chiang, J. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Conrad, J. ;

Costamante, L. ;

Cutini, S. ;

Dermer, C. D. ;

de Angelis, A. ;

de Palma, F. ;

do Couto e Silva, E. ;

Drell, P. S. ;

Dubois, R. ;

Dumora, D. ;

Farnier, C. ;

Favuzzi, C. .

ASTROPHYSICAL JOURNAL, 2010, 720 (01) :435-453

[2] Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived from First-Year Fermi Large Area Telescope Data [J].

abdo, A. A. ;

Ackermann, M. ;

Ajello, M. ;

Atwood, W. B. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Bastieri, D. ;

Baughman, B. M. ;

Bechtol, K. ;

Bellazzini, R. ;

Berenji, B. ;

Blandford, R. D. ;

Bloom, E. D. ;

Bonamente, E. ;

Borgland, A. W. ;

Bregeon, J. ;

Brez, A. ;

Brigida, M. ;

Bruel, P. ;

Burnett, T. H. ;

Buson, S. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caraveo, P. A. ;

Casandjian, J. M. ;

Cavazzuti, E. ;

Cecchi, C. ;

Celik, Oe ;

Charles, E. ;

Chekhtman, A. ;

Cheung, C. C. ;

Chiang, J. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Cominsky, L. R. ;

Conrad, J. ;

Cutini, S. ;

Dermer, C. D. ;

de Angelis, A. ;

de Palma, F. ;

Digel, S. W. ;

Di Bernardo, G. ;

do Couto e Silva, E. ;

Drell, P. S. ;

Drlica-Wagner, A. ;

Dubois, R. ;

Dumora, D. ;

Farnier, C. .

PHYSICAL REVIEW LETTERS, 2010, 104 (10)

[3] FERMI LARGE AREA TELESCOPE FIRST SOURCE CATALOG [J].

Abdo, A. A. ;

Ackermann, M. ;

Ajello, M. ;

Allafort, A. ;

Antolini, E. ;

Atwood, W. B. ;

Axelsson, M. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Bastieri, D. ;

Baughman, B. M. ;

Bechtol, K. ;

Bellazzini, R. ;

Belli, F. ;

Berenji, B. ;

Bisello, D. ;

Blandford, R. D. ;

Bloom, E. D. ;

Bonamente, E. ;

Bonnell, J. ;

Borgland, A. W. ;

Bouvier, A. ;

Bregeon, J. ;

Brez, A. ;

Brigida, M. ;

Bruel, P. ;

Burnett, T. H. ;

Busetto, G. ;

Buson, S. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Campana, R. ;

Canadas, B. ;

Caraveo, P. A. ;

Carrigan, S. ;

Casandjian, J. M. ;

Cavazzuti, E. ;

Ceccanti, M. ;

Cecchi, C. ;

Celik, Oe. ;

Charles, E. ;

Chekhtman, A. ;

Cheung, C. C. ;

Chiang, J. ;

Cillis, A. N. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Conrad, J. .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2010, 188 (02) :405-436

[4]

Abdo A.A., 2010, Phys. Rev. Lett

[5] Searches for cosmic-ray electron anisotropies with the Fermi Large Area Telescope [J].

Ackermann, M. ;

Ajello, M. ;

Atwood, W. B. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Bastieri, D. ;

Bechtol, K. ;

Bellazzini, R. ;

Berenji, B. ;

Bloom, E. D. ;

Bonamente, E. ;

Borgland, A. W. ;

Bouvier, A. ;

Bregeon, J. ;

Brez, A. ;

Brigida, M. ;

Bruel, P. ;

Buehler, R. ;

Burnett, T. H. ;

Buson, S. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caraveo, P. A. ;

Carrigan, S. ;

Casandjian, J. M. ;

Cecchi, C. ;

Celik, Oe ;

Charles, E. ;

Chekhtman, A. ;

Cheung, C. C. ;

Chiang, J. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Conrad, J. ;

Cuoco, A. ;

Dermer, C. D. ;

de Angelis, A. ;

de Palma, F. ;

Digel, S. W. ;

Di Bernardo, G. ;

do Couto e Silva, E. ;

Drell, P. S. ;

Dubois, R. ;

Favuzzi, C. ;

Fegan, S. J. ;

Focke, W. B. ;

Frailis, M. ;

Fukazawa, Y. .

PHYSICAL REVIEW D, 2010, 82 (09)

[6]

Ackermann M., ASTROPHYSIC IN PRESS

[7]

Ackermann M., 2011, ARXIV11083546T FERM

[8] Anisotropy of the cosmic gamma-ray background from dark matter annihilation [J].

Ando, S ;

Komatsu, E .

PHYSICAL REVIEW D, 2006, 73 (02)

[9] Dark matter annihilation or unresolved astrophysical sources? Anisotropy probe of the origin of the cosmic gamma-ray background [J].

Ando, Shin'ichiro ;

Komatsu, Eiichiro ;

Narumoto, Takuro ;

Totani, Tomonori .

PHYSICAL REVIEW D, 2007, 75 (06)

[10] Angular power spectrum of gamma-ray sources for GLAST:: blazars and clusters of galaxies [J].

Ando, Shin'ichiro ;

Komatsu, Eiichiro ;

Narumoto, Takuro ;

Totani, Tomonori .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2007, 376 (04) :1635-1647

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