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The Influence of the Local Bubble on the Ionization of the Local Interstellar Cloud

Published online by Cambridge University Press:  12 April 2016

Jonathan D. Slavin  and
Priscilla C. Frisch
Jonathan D. Slavin
Affiliation:
NASA/Ames Research Center, MS 245-3, Moffett Field, CA 94035-1000, USA
Priscilla C. Frisch
Affiliation:
University of Chicago, Department of Astronomy and Astrophysics, 5460 S. Ellis Avenue, Chicago, IL 60637, USA

Abstract

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The ionization of the the Local Interstellar Cloud (LIC) is quite unusual compared with most warm (T ~ 104 K) interstellar gas. Hydrogen and helium are both partially ionized with helium surprisingly more ionized than hydrogen. Directly observed ionization sources including nearby stellar EUV sources and the diffuse emission of the Soft X-ray Background (SXRB), do not provide enough ionization and heating to account for both the ionization state and temperature of the LIC. We propose that an evaporative boundary between the LIC and the hot gas of the Local Bubble can provide the necessary ionizing radiation. Results of detailed models of the emission from the interface are presented and shown to be adequate to explain the observations.

Type
Part V Magnetic Fields, Molecular Clouds, and Interstellar Bubbles
Information
International Astronomical Union Colloquium , Volume 166: The Local Bubble and Beyond , 1997 , pp. 305 - 308
Copyright
Copyright © Springer-Verlag 1998

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