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Broad view on hard X-ray background emission of the Galaxy

Published online by Cambridge University Press:  21 October 2010

Roman Krivonos ,
Mikhail Revnivtsev ,
Sergey Tsygankov ,
Eugene Churazov  and
Rashid Sunyaev
Roman Krivonos
Affiliation:
Max Planck Institute for Astrophysics, Garching, Germany email: krivonos@mpa-garching.mpg.de Space Research Institute, Moscow, Russia
Mikhail Revnivtsev
Affiliation:
Space Research Institute, Moscow, Russia Excellence Cluster Universe, Technische Universitat Muenchen, Garching, Germany
Sergey Tsygankov
Affiliation:
Max Planck Institute for Astrophysics, Garching, Germany email: krivonos@mpa-garching.mpg.de Space Research Institute, Moscow, Russia
Eugene Churazov
Affiliation:
Max Planck Institute for Astrophysics, Garching, Germany email: krivonos@mpa-garching.mpg.de Space Research Institute, Moscow, Russia
Rashid Sunyaev
Affiliation:
Max Planck Institute for Astrophysics, Garching, Germany email: krivonos@mpa-garching.mpg.de Space Research Institute, Moscow, Russia
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Abstract

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The nature of the Galactic Ridge X-Ray Emission (GRXE) has been under scientific debate since its discovery more than 30 years ago. It is observed as extended emission along the Galactic disk. The question was: is GRXE truly diffuse or is it composed from a large number of unresolved point sources? Using near-infrared Galaxy maps measured with the DIRBE experiment and data from the INTEGRAL observatory, we show that the galactic background in the energy range 20-60 keV originates from the stellar population of the Galaxy, which is in contrast to the diffuse nature believed before (Krivonos et al., 2007). Here we show preliminary results of studying the transition region from hard X-rays to gamma diffuse background of the Galaxy, revealing the broad band picture of Galactic Background emission.

Keywords

Galaxy: diskGalaxy: bulgeGalaxy: stellar contentISM: cosmic rays
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Highlights H15: Highlights of Astronomy , November 2009 , pp. 810
Copyright
Copyright © International Astronomical Union 2010

References

Krivonos, R., Revnivtsev, M., et al. , 2007, A&A 463, 957Google Scholar
Kraushaar, et al. , 1972, ApJ, 177, 341CrossRefGoogle Scholar
Bouchet, et al. , 2008, The Astrophysical Journal, 679, 1315Google Scholar