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

共 38 条

[21]

MOSKALENKO IV, 1998, IN PRESS P 16 EUR CO

[22] GAMMA-RAYS FROM PRIMORDIAL BLACK-HOLES [J].

PAGE, DN ;

HAWKING, SW .

ASTROPHYSICAL JOURNAL, 1976, 206 (01) :1-7

[23]

PFENNIGER D, 1994, ASTRON ASTROPHYS, V285, P79

[24]

POHL M, 1998, IN PRESS P 16 EUR CO

[25] AN EFFECTIVE ALGORITHM FOR THE NONCENTRAL CHI-SQUARED DISTRIBUTION FUNCTION [J].

POSTEN, HO .

AMERICAN STATISTICIAN, 1989, 43 (04) :261-263

[26]

SIMPSON JA, 1998, APJ L, V497, P85

[27] The 'extragalactic' diffuse gamma ray intensity [J].

Smialkowski, A ;

Wolfendale, AW ;

Zhang, L .

ASTROPARTICLE PHYSICS, 1997, 7 (1-2) :21-25

[28] Egret observations of the extragalactic gamma-ray emission [J].

Sreekumar, P ;

Bertsch, DL ;

Dingus, BL ;

Esposito, JA ;

Fichtel, CE ;

Hartman, RC ;

Hunter, SD ;

Kanbach, G ;

Kniffen, DA ;

Lin, YC ;

Mayer-Hasselwander, HA ;

Michelson, PF ;

von Montigny, C ;

Mucke, A ;

Mukherjee, R ;

Nolan, PL ;

Pohl, M ;

Reimer, O ;

Schneid, E ;

Stacy, JG ;

Stecker, FW ;

Thompson, DJ ;

Willis, TD .

ASTROPHYSICAL JOURNAL, 1998, 494 (02) :523-534

[29]

STRONG AW, 1998, IN PRESS APJ, P509

[30]

STRONG AW, 1984, ADV SPACE RES, V3, P87

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