A LOCALIZED EXCESS OF DIFFUSE GAMMA-RADIATION

被引：6

作者：

CHEN, A ^{[1
]}

DWYER, J ^{[1
]}

KAARET, P ^{[1
]}

机构：

[1] COLUMBIA UNIV,COLUMBIA ASTROPHYS LAB,NEW YORK,NY 10027

来源：

ASTROPHYSICAL JOURNAL | 1995年 / 445卷 / 02期

关键词：

COSMIC RAYS; GALAXY; STRUCTURE; GAMMA RAYS; OBSERVATIONS; ISM; ATOMS;

D O I：

10.1086/187901

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using archival EGRET gamma-ray data and atomic hydrogen (H I) column densities derived from 21 cm radio observations, we have found a large irregular region in the northern Galactic hemisphere extending from (l similar to 90 degrees, b similar to 52 degrees) to (l similar to 45 degrees, b similar to 77 degrees) with a significant enhancement in the gamma-ray emissivity compared to the surrounding sky. The region contains no previously identified gamma-ray point sources. The emission may arise from a localized enhancement in cosmic-ray density or from the presence of matter other than H I. If the emission is due to unseen matter, a column density enhancement equivalent to similar to 2 x 10(20) H-atoms cm(-2) is required.

引用

页码：L109 / L112

页数：4

共 25 条

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