Evidence for a Galactic gamma-ray halo

被引：84

作者：

Dixon, DD ^{[1
]}

Hartmann, DH

Kolaczyk, ED

Samimi, J

Diehl, R

Kanbach, G

Mayer-Hasselwander, H

Strong, AW

机构：

[1] Univ Calif Riverside, Inst Geophys & Planetary Phys, Riverside, CA 92521 USA

[2] Clemson Univ, Dept Phys & Astron, Clemson, SC 29634 USA

[3] Boston Univ, Dept Math & Stat, Boston, MA 02215 USA

[4] Sharif Univ Technol, Tehran, Iran

[5] MPE, D-85740 Garching, Germany

来源：

NEW ASTRONOMY | 1998年 / 3卷 / 07期

基金：

美国国家航空航天局;

关键词：

galaxy : halo; gamma rays : observations; cosmic rays; dark matter; techniques : image processing;

D O I：

10.1016/S1384-1076(98)00024-4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present quantitative statistical evidence for a gamma-ray emission halo surrounding the Galaxy. Maps of the emission are derived. EGRET data were analyzed in a wavelet-based non-parametric hypothesis testing framework, using a model of expected diffuse (Galactic + isotropic) emission as a null hypothesis. The results show a statistically significant large scale halo surrounding the center of the Milky Way as seen from Earth. The halo flux at high latitudes is somewhat smaller than the isotropic gamma-ray flux at the same energy, though of the same order (O(10(-7)-10(-6)) ph cm(-2) s(-1 )sr(-1) above 1 GeV). (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：539 / 561

页数：23

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