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The cosmic ray ionization rate in the central parsec of the Galaxy

Published online by Cambridge University Press:  22 May 2014

Miwa Goto
Miwa Goto*
Affiliation:
Universitäts-Sternwarte München, Scheinerstr. 1, D-81679 Munich, Germany email: [email protected]
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Abstract

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Cosmic rays represent a unique crossing point of high-energy astrophysics and astrochemistry. The cosmic ray ionization rate of molecular hydrogen (ζ2) measured by H3+ spectroscopy in the central parsec of the Galaxy is 2 orders of magnitude higher than that in the dense clouds outside the Galactic center. However, it is still too short, by the factor of 10,000, to agree with an extremely high ζ2 that accommodates the new γ-ray observations of Sgr A* and its environment.

Keywords

Galaxy: center — cosmic rays — astrochemistry — ISM: clouds — ISM: lines and bands — ISM: molecules — stars: individual (GCIRS 1W, GCIRS 3)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S303: The Galactic Center: Feeding and Feedback in a Normal Galactic Nucleus , October 2013 , pp. 429 - 433
Copyright
Copyright © International Astronomical Union 2014 

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