MEASUREMENT OF THE SPATIAL DISTRIBUTION OF DIFFUSE TeV GAMMA-RAY EMISSION FROM THE GALACTIC PLANE WITH MILAGRO

被引：120

作者：

Abdo, A. A. ^{[1
]}

Allen, B. ^{[2
]}

Aune, T. ^{[3
]}

Berley, D. ^{[4
]}

Blaufuss, E. ^{[4
]}

Casanova, S. ^{[5
]}

Chen, C. ^{[6
]}

Dingus, B. L. ^{[7
]}

Ellsworth, R. W. ^{[8
]}

Fleysher, L. ^{[9
]}

Fleysher, R. ^{[9
]}

Gonzalez, M. M. ^{[10
]}

Goodman, J. A. ^{[4
]}

Hoffman, C. M. ^{[7
]}

Huentemeyer, P. H. ^{[7
]}

Kolterman, B. E. ^{[9
]}

Lansdell, C. P. ^{[11
]}

Linnemann, J. T. ^{[12
]}

McEnery, J. E. ^{[13
]}

Mincer, A. I. ^{[9
]}

Moskalenko, I. V. ^{[14
,15
]}

Nemethy, P. ^{[9
]}

Noyes, D. ^{[4
]}

Porter, T. A. ^{[3
]}

Pretz, J. ^{[7
]}

Ryan, J. M. ^{[16
]}

Parkinson, P. M. Saz ^{[3
]}

Shoup, A. ^{[17
]}

Sinnis, G. ^{[7
]}

Smith, A. J. ^{[4
]}

Strong, A. W. ^{[18
]}

Sullivan, G. W. ^{[4
]}

Vasileiou, V. ^{[4
]}

Walker, G. P. ^{[7
]}

Williams, D. A. ^{[3
]}

Yodh, G. B. ^{[6
]}

机构：

[1] USN, Res Lab, Washington, DC 20375 USA

[2] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

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

[4] Univ Maryland, College Pk, MD 20742 USA

[5] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany

[6] Univ Calif Irvine, Irvine, CA USA

[7] Los Alamos Natl Lab, Los Alamos, NM USA

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

[9] NYU, New York, NY USA

[10] Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 04510, DF, Mexico

[11] Inst Def Anal, Alexandria, VA USA

[12] Michigan State Univ, E Lansing, MI 48824 USA

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

[14] Stanford Univ, HEPL, Stanford, CA 94305 USA

[15] Stanford Univ, KIPAC, Stanford, CA 94305 USA

[16] Univ New Hampshire, Durham, NH 03824 USA

[17] Ohio State Univ, Lima, OH 45804 USA

[18] Max Planck Inst Extraterr Phys, D-37075 Garching, Germany

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 688卷 / 02期

基金：

美国国家科学基金会;

关键词：

gamma rays: observations;

D O I：

10.1086/592213

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Diffuse gamma-ray emission produced by the interaction of cosmic-ray particles with matter and radiation in the Galaxy can be used to probe the distribution of cosmic rays and their sources in different regions of the Galaxy. With its large field of view and long observation time, the Milagro Gamma Ray Observatory is an ideal instrument for surveying large regions of the northern hemisphere sky and for detecting diffuse gamma-ray emission at very high energies. Here the spatial distribution and the flux of the diffuse gamma-ray emission in the TeV energy range with a median energy of 15 TeV for Galactic longitude between 30 degrees and 110 degrees and between 136 degrees and 216 degrees and for Galactic latitude between -10 degrees and 10 degrees are determined. The measured fluxes are consistent with predictions of the GALPROP model everywhere, except for the Cygnus region (l is an element of[65 degrees, 85 degrees]). For the Cygnus region, the flux is twice the predicted value. This excess can be explained by the presence of active cosmic-ray sources accelerating hadrons, which interact with the local dense interstellar medium and produce gamma rays through pion decay.

引用

页码：1078 / 1083

页数：6

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