Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived from First-Year Fermi Large Area Telescope Data

被引：435

作者：

abdo, A. A. ^{[1
,2
]}

Ackermann, M. ^{[3
,4
]}

Ajello, M. ^{[3
,4
]}

Atwood, W. B. ^{[5
,6
]}

Baldini, L. ^{[7
]}

Ballet, J. ^{[8
]}

Barbiellini, G. ^{[9
,10
]}

Bastieri, D. ^{[11
,12
]}

Baughman, B. M. ^{[13
]}

Bechtol, K. ^{[3
,4
]}

Bellazzini, R. ^{[7
]}

Berenji, B. ^{[3
,4
]}

Blandford, R. D. ^{[3
,4
]}

Bloom, E. D. ^{[3
,4
]}

Bonamente, E. ^{[14
,15
]}

Borgland, A. W. ^{[3
,4
]}

Bregeon, J. ^{[7
]}

Brez, A. ^{[7
]}

Brigida, M. ^{[16
,17
]}

Bruel, P. ^{[18
]}

Burnett, T. H. ^{[19
]}

Buson, S. ^{[12
]}

Caliandro, G. A. ^{[20
]}

Cameron, R. A. ^{[3
,4
]}

Caraveo, P. A. ^{[21
]}

Casandjian, J. M. ^{[8
]}

Cavazzuti, E. ^{[22
]}

Cecchi, C. ^{[14
,15
]}

Celik, Oe ^{[23
,24
,25
,26
]}

Charles, E. ^{[3
,4
]}

Chekhtman, A. ^{[1
,27
]}

Cheung, C. C. ^{[1
,2
]}

Chiang, J. ^{[3
,4
]}

Ciprini, S. ^{[15
]}

Claus, R. ^{[3
,4
]}

Cohen-Tanugi, J. ^{[28
]}

Cominsky, L. R. ^{[29
]}

Conrad, J. ^{[30
,31
,32
]}

Cutini, S. ^{[22
]}

Dermer, C. D. ^{[1
]}

de Angelis, A. ^{[33
,34
]}

de Palma, F. ^{[16
,17
]}

Digel, S. W. ^{[3
,4
]}

Di Bernardo, G. ^{[7
]}

do Couto e Silva, E. ^{[3
,4
]}

Drell, P. S. ^{[3
,4
]}

Drlica-Wagner, A. ^{[3
,4
]}

Dubois, R. ^{[3
,4
]}

Dumora, D. ^{[35
,36
]}

Farnier, C. ^{[28
]}

机构：

[1] USN, Res Lab, Div Space Sci, Washington, DC 20375 USA

[2] Natl Acad Sci, Washington, DC 20001 USA

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

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

[5] Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Dept Phys, Santa Cruz, CA 95064 USA

[6] Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA

[7] Ist Nazl Fis Nucl, I-56127 Pisa, Italy

[8] Univ Paris Diderot, Lab AIM, CEA IRFU, CNRS,Serv Astrophys,CEA Saclay, F-91191 Gif Sur Yvette, France

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

[10] Univ Trieste, Dipartmento Fis, I-34127 Trieste, Italy

[11] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy

[12] Univ Padua, Dipartimento Fis G Galilei, I-35131 Padua, Italy

[13] Ohio State Univ, Dept Phys, Ctr Cosmol & Astroparticle Phys, Columbus, OH 43210 USA

[14] Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, Italy

[15] Univ Perugia, Dipartimento Fis, I-06123 Perugia, Italy

[16] Univ & Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy

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

[18] Ecole Polytech, CNRS, IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France

[19] Univ Washington, Dept Phys, Seattle, WA 98195 USA

[20] CSIC, Inst Ciencies Espai, IEEC, Barcelona 08193, Spain

[21] INAF Ist Astrofis Spaziale & Fis Cosm, I-20133 Milan, Italy

[22] ASI Sci Data Ctr, I-00044 Rome, Italy

[23] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[24] CRESST, Greenbelt, MD 20771 USA

[25] Univ Maryland Baltimore Cty, Dept Phys, Baltimore, MD 21250 USA

[26] Univ Maryland Baltimore Cty, Ctr Space Sci & Technol, Baltimore, MD 21250 USA

[27] George Mason Univ, Fairfax, VA 22030 USA

[28] Univ Montpellier 2, CNRS, IN2P3, Lab Phys Theor & Astroparticules, Montpellier, France

[29] Sonoma State Univ, Dept Phys & Astron, Rohnert Pk, CA 94928 USA

[30] Stockholm Univ, Dept Phys, SE-10691 Stockholm, Sweden

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

[32] Royal Swedish Acad Sci, S-10405 Stockholm, Sweden

[33] Univ Udine, Dipartimento Fis, I-33100 Udine, Italy

[34] Ist Nazl Fis Nucl, Sez Trieste, Grp Coll Udine, I-33100 Udine, Italy

[35] Univ Bordeaux, Ctr Etud Nucl Bordeaux Gradignan, UMR 5797, F-33175 Gradignan, France

[36] CEN Bordeaux Gradignan, CNRS, IN2P3, UMR 5797, F-33175 Gradignan, France

[37] Hiroshima Univ, Dept Phys Sci, Hiroshima 7398526, Japan

[38] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[39] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

[40] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[41] Max Planck Inst Radioastron, D-53121 Bonn, Germany

[42] Univ Alabama, CSPAR, Huntsville, AL 35899 USA

[43] Royal Inst Technol KTH, Dept Phys, SE-10691 Stockholm, Sweden

[44] Waseda Univ, Shinjuku Ku, Tokyo 1698050, Japan

[45] Tokyo Inst Technol, Dept Phys, Tokyo 1528551, Japan

[46] RIKEN, Cosm Radiat Lab, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan

[47] CNRS UPS, Ctr Etud Spatiale Rayonnements, F-31028 Toulouse 4, France

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

[49] Univ Denver, Dept Phys & Astron, Denver, CO 80208 USA

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

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 10期

基金：

瑞典研究理事会;

关键词：

INVERSE COMPTON-SCATTERING; SOLAR;

D O I：

10.1103/PhysRevLett.104.101101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on the first Fermi Large Area Telescope (LAT) measurements of the so-called "extra-galactic" diffuse gamma-ray emission (EGB). This component of the diffuse gamma-ray emission is generally considered to have an isotropic or nearly isotropic distribution on the sky with diverse contributions discussed in the literature. The derivation of the EGB is based on detailed modeling of the bright foreground diffuse Galactic gamma-ray emission, the detected LAT sources, and the solar gamma-ray emission. We find the spectrum of the EGB is consistent with a power law with a differential spectral index gamma = 2.41 +/- 0.05 and intensity I(>100 MeV) = (1.03 +/- 0.17) x 10(-5) cm(-2) s(-1) sr(-1), where the error is systematics dominated. Our EGB spectrum is featureless, less intense, and softer than that derived from EGRET data.

引用

页数：7

共 24 条

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