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Title:
High-Latitude Molecular Clouds as Gamma-Ray Sources for the Gamma-Ray Large Area Space Telescope
Authors:
Torres, Diego F.; Dame, T. M.; Digel, Seth W.
Affiliation:
AA(Lawrence Livermore National Laboratory, 7000 East Avenue, L-413, Livermore, CA 94550; .), AB(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS72, Cambridge, MA 02138; .), AC(Stanford Linear Accelerator Center, 2575 Sand Hill Road, M/S 43A, Menlo Park, CA 94025; .)
Publication:
The Astrophysical Journal, Volume 621, Issue 1, pp. L29-L32. (ApJ Homepage)
Publication Date:
03/2005
Origin:
UCP
ApJ Keywords:
ISM: Cosmic Rays, Gamma Rays: Observations, Gamma Rays: Theory, ISM: Clouds
DOI:
10.1086/428903
Bibliographic Code:
2005ApJ...621L..29T

Abstract

For about two decades, a population of relatively small and nearby molecular clouds has been known to exist at high Galactic latitudes. Lying more than 10° from the Galactic plane, these clouds have typical distances of ~150 pc, angular sizes of ~1°, and masses of order tens of solar masses. These objects are passive sources of high-energy γ-rays through cosmic-ray-gas interactions. Using a new wide-angle CO survey of the northern sky, we show that typical high-latitude clouds are not bright enough in γ-rays to have been detected by EGRET but that of order 100 of them will be detectable by the Large Area Telescope on the Gamma-Ray Large Area Space Telescope. Thus, we predict a new steady population of γ-ray sources at high Galactic latitudes, perhaps the most numerous after active galactic nuclei.
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