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Molecular Clouds Observed by the EGRET Gamma-Ray Telescope

Published online by Cambridge University Press:  25 May 2016

Seth. W. Digel ,
Stanley D. Hunter ,
Reshmi Mukherjee ,
Eugéne J. de Geus ,
Isabelle A. Grenier ,
Reas Heithausen ,
Gottfried Kanbach  and
Patrick Thaddeus
Seth. W. Digel
Affiliation:
NASA/Goddard Space Flight Center
Stanley D. Hunter
Affiliation:
NASA/Goddard Space Flight Center
Reshmi Mukherjee
Affiliation:
NASA/Goddard Space Flight Center
Eugéne J. de Geus
Affiliation:
California Institute of Technology
Isabelle A. Grenier
Affiliation:
Centre d'Etudes Saclay
Reas Heithausen
Affiliation:
Universität zu Köln
Gottfried Kanbach
Affiliation:
Max-Planck-Institut für Extraterrestrische Physik
Patrick Thaddeus
Affiliation:
Harvard-Smithsonian Center for Astrophysics

Extract

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EGRET, the high-energy γ-ray telescope on the Compton Gamma-Ray Observatory, has the sensitivity, angular resolution, and background rejection necessary to study diffuse γ-ray emission from the interstellar medium (ISM). High-energy γ rays produced in cosmic-ray (CR) interactions in the ISM can be used to determine the CR density and calibrate the CO line as a tracer of molecular mass. Dominant production mechanisms for γ rays of energies ∼30 MeV–30 GeV are the decay of pions produced in collisions of CR protons with ambient matter and Bremsstrahlung scattering of CR electrons.

Type
Molecular Clouds in the Milky Way
Information
Symposium - International Astronomical Union , Volume 170: CO: Twenty-Five Years of Millimeter-Wave Spectroscopy , 1997 , pp. 22 - 24
Copyright
Copyright © Kluwer 1997 

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