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Inverse Compton Origin of the Hard X-Ray and Soft Gamma-Ray Emission from the Galactic Ridge

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arxiv 0804.1774 v1 pith:WZDLBK24 submitted 2008-04-10 astro-ph

Inverse Compton Origin of the Hard X-Ray and Soft Gamma-Ray Emission from the Galactic Ridge

Troy A. Porter (SCIPP/UCSC) , Igor V. Moskalenko (HEPL/Stanford/KIPAC) , Andrew W. Strong (MPE) , Elena Orlando (MPE) , Laurent Bouchet (CESR-CNRS) This is my paper
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keywords emissiongalacticgamma-rayelectronshardinterstellaroriginridge
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A recent re-determination of the non-thermal component of the hard X-ray to soft gamma-ray emission from the Galactic ridge, using the SPI instrument on the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) Observatory, 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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