Inverse Compton Origin of the Hard X-ray and Soft gamma-ray Emission from the Galactic Ridge

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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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9 pages

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Porter, Troy A.; Moskalenko, Igor V.; Strong, Andrew W.; Orlando, Elena & Bouchet, Laurent September 30, 2008.

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Description

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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9 pages

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  • Journal Name: Astrophys.J.682:400-407, 2008; Journal Volume: 682

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  • Report No.: SLAC-PUB-13211
  • Grant Number: AC02-76SF00515
  • DOI: 10.1086/589615 | External Link
  • Office of Scientific & Technical Information Report Number: 939111
  • Archival Resource Key: ark:/67531/metadc897362

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Office of Scientific & Technical Information Technical Reports

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  • September 30, 2008

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 29, 2016, 4:17 p.m.

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Porter, Troy A.; Moskalenko, Igor V.; Strong, Andrew W.; Orlando, Elena & Bouchet, Laurent. Inverse Compton Origin of the Hard X-ray and Soft gamma-ray Emission from the Galactic Ridge, article, September 30, 2008; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc897362/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.