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Diffusion of cosmic-ray electrons in the Galactic centre molecular cloud G0.13–0.13

Published online by Cambridge University Press:  22 May 2014

Andrew Lehmann  and
Mark Wardle
Andrew Lehmann
Affiliation:
Department of Physics Astronomy, and Research Center in Astronomy, Astrophysics & Astrophotonics, Macquarie University, 2109, NSW, Sydney email: andrew.lehmann@mq.edu.au
Mark Wardle
Affiliation:
Department of Physics Astronomy, and Research Center in Astronomy, Astrophysics & Astrophotonics, Macquarie University, 2109, NSW, Sydney email: andrew.lehmann@mq.edu.au
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Abstract

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The Galactic center (GC) molecular cloud G0.13–0.13 exhibits a shell morphology in CS J = (1 − 0), with ∼ 105 solar masses and expansion speed ∼ 20 km s−1, yielding a total kinetic energy ∼ 1051 erg. Its morphology is also suggestive of an interaction with the nonthermal filaments of the GC arc. 74 MHz emission indicates the presence of a substantial population of low energy electrons permeating the cloud, which could either be produced by the interaction with the arc or accelerated in the shock waves responsible for the cloud's expansion. These scenarios are explored using time dependent diffusion models.

With these diffusion models, we determine the penetration of low-energy cosmic-ray electrons accelerated into G0.13–0.13 and calculate the spatial distribution of the cosmic-ray ionization and heating rates. We show that the 6.4 keV Fe Kα line emission associated with the electron population provides an observational diagnostic to distinguish these two acceleration scenarios.

We discuss the implications of our results for understanding the distinct character of clouds in the central molecular zone compared to clouds in the Galactic disk, and how GC nonthermal filaments interact with molecular clouds.

Keywords

Galaxy: centerISM: cloudsdiffusioncosmic rays
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. 434 - 438
Copyright
Copyright © International Astronomical Union 2014 

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