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Title:
Inverse Compton Origin of the Hard X-Ray and Soft Gamma-Ray Emission from the Galactic Ridge
Authors:
Porter, Troy A.; Moskalenko, Igor V.; Strong, Andrew W.; Orlando, Elena; Bouchet, L.
Affiliation:
AA(Santa Cruz Institute for Particle Physics, University of California, Santa Cruz, CA 95064), AB(Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305), AC(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, D-85741 Garching, Germany), AD(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, D-85741 Garching, Germany), AE(CESR-CNRS, 9 Avenue du Colonel Roche, 31028 Toulouse Cedex 04, France)
Publication:
The Astrophysical Journal, Volume 682, Issue 1, pp. 400-407. (ApJ Homepage)
Publication Date:
07/2008
Origin:
UCP
ApJ Keywords:
ISM: Cosmic Rays, Elementary Particles, Gamma Rays: Theory
Abstract Copyright:
(c) 2008: The American Astronomical Society
DOI:
10.1086/589615
Bibliographic Code:
2008ApJ...682..400P

Abstract

A recent redetermination of the nonthermal component of the hard X-ray to soft γ-ray emission from the Galactic ridge, using the SPI instrument on the International Gamma-Ray Astrophysics Laboratory (INTEGRAL), is shown to be well reproduced as inverse Compton emission from the interstellar medium. Both cosmic-ray primary electrons and secondary electrons and positrons contribute to the emission. The prediction uses the GALPROP model and includes a new calculation of the interstellar radiation field. This may solve a long-standing mystery of the origin of this emission, and potentially opens a new window on Galactic cosmic rays.
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