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Dark gas: a new possible link between low and high-energy phenomena

Published online by Cambridge University Press:  17 August 2012

Kazufumi Torii ,
Yasuo Fukui ,
Hidetoshi Sano ,
Junki Sato ,
Takeshi Okuda ,
Hiroaki Yamamoto ,
Akiko Kawamura ,
Norikazu Mizuno ,
Toshikazu Onishi  and
Hideo Ogawa
Kazufumi Torii
Affiliation:
Department of Physics and Astrophysics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan email: [email protected]
Yasuo Fukui
Affiliation:
Department of Physics and Astrophysics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan email: [email protected]
Hidetoshi Sano
Affiliation:
Department of Physics and Astrophysics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan email: [email protected]
Junki Sato
Affiliation:
Department of Physics and Astrophysics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan email: [email protected]
Takeshi Okuda
Affiliation:
Department of Physics and Astrophysics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan email: [email protected]
Hiroaki Yamamoto
Affiliation:
Department of Physics and Astrophysics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan email: [email protected]
Akiko Kawamura
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan
Norikazu Mizuno
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan
Toshikazu Onishi
Affiliation:
Department of Astrophysics, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
Hideo Ogawa
Affiliation:
Department of Astrophysics, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
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Abstract

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Galactic-scale studies of γ-rays and sub-mm radiation suggest that a significant amount of neutral interstellar medium is not detectable either in CO or HI (Grenier et al. 2005; Ade et al. 2011). This component is called “dark gas”. Here we argue that cool and dense atomic gas without molecules is responsible for the dark gas. This interpretation is supported by a recent finding of cool HI gas corresponding to the TeV γ-ray shell in the SNR RX J1713.7-3946 (Fukui et al. 2011). Such HI gas is not recognized under a usual assumption of optically thin HI emission but is identified by a careful analysis considering optically thick HI. The typical column density of such HI gas is a few times 1021 cm−2 and is also identified as visual extinction.

Keywords

ISM: cloudscosmic rayssupernova remnantsgamma rays: observationsdark gas
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S284: The Spectral Energy Distribution of Galaxies , September 2011 , pp. 389 - 392
Copyright
Copyright © International Astronomical Union 2012

References

Ade, P. A. R. et al. 2011, arXiv: 1101.2029v1Google Scholar
Aharonian, F. A., et al. 2006, A&A, 449, 223Google Scholar
Goldsmith, P. F., Li, D., & Krčo, M. 2007, ApJ, 654, 273CrossRefGoogle Scholar
Grenier, I. A., Casandjian, J.-M., & Terrier, R. 2005, Science, 307, 1292CrossRefGoogle Scholar
Fukui, Y., et al. 2003, PASJ, 55, 61CrossRefGoogle Scholar
Fukui, Y., et al. 2011, ApJ, in pressGoogle Scholar
Fukui, Y. & Kawamura, A. 2010, ARAA, 48, 547CrossRefGoogle Scholar
Koyama, H. & Inutsuka, S. 2000, ApJ, 532, 980CrossRefGoogle Scholar
McClure-Griffiths, N. M. et al. 2005, ApJS, 158, 178CrossRefGoogle Scholar
Sato, F. & Fukui, Y. 1978, ApJ, 83, 1607CrossRefGoogle Scholar
Yamamoto, et al. 2006, ApJ, 642, 307CrossRefGoogle Scholar