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High-energy gamma rays and the large-scale distribution of gas and cosmic rays

Published online by Cambridge University Press:  04 August 2017

W. Hermsen  and
J.B.G.M. Bloemen
W. Hermsen
Affiliation:
Cosmic Ray Working Group, Huygens Laboratorium, Leiden, The Netherlands
J.B.G.M. Bloemen
Affiliation:
Sterrewacht and Cosmic Ray Working Group, Huygens Laboratorium, Leiden, The Netherlands

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The COS-B gamma-ray survey is compared with 12CO and HI surveys in a region containing the Orion complex and in the outer Galaxy. The observed gamma-ray intensities in the Orion region (100 MeV<E<5 GeV) can be ascribed to the interaction of uniformly distributed cosmic rays with the interstellar gas. Calibration of the ratio between H2 column-density and integrated CO line intensity resulted in the value: (3.0±0.7)x102 0 molecules cm-2K -1km -1s. In the outer Galaxy HI column-density maps in three galacto-centric distance ranges are used in combination with COS-B gamma-ray data to determine the radial distribution of the gamma-ray emissivity. A steep negative gradient of the emissivity for the 70 MeV-150 MeV range and an approximately constant (within ~20%) emissivity for the 300 MeV-5 GeV range is found. The result is interpreted as a strong decrease in the cosmic-ray electron density and a near constancy of the nuclear component.

Type
PART II: COMPOSITION, STRUCTURE AND KINEMATICS
Information
Symposium - International Astronomical Union , Volume 106: The Milky Way Galaxy , 1985 , pp. 213 - 218
Copyright
Copyright © Reidel 1985 

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