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A localized excess of diffuse gamma radiationUsing archival Energetic Gamma Ray Experiment Telescope (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 approximately 90 deg, b approximately 52 deg) to (l approximately 45 deg, b approximately 77 deg) 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 approximately 2 x 10(exp 20) H-atoms/sq cm is required.
Document ID
19950056297
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Chen, A.
(Columbia University New York, New York, United States)
Dwyer, J.
(Columbia University New York, New York, United States)
Kaaret, P.
(Columbia University New York, New York, United States)
Date Acquired
August 16, 2013
Publication Date
June 1, 1995
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 445
Issue: 2
ISSN: 0004-637X
Subject Category
Astronomy
Accession Number
95A87896
Funding Number(s)
CONTRACT_GRANT: NAG5-2235
Distribution Limits
Public
Copyright
Other

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