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ASCA SIS X-ray Observations of the Wind Blown Bubble NGC 6888

Published online by Cambridge University Press:  12 April 2016

Matthias Wrigge ,
You-Hua Chu ,
Eugene A. Magnier  and
Yuichi Kamata
Matthias Wrigge
Affiliation:
Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany
You-Hua Chu
Affiliation:
Astronomy Dept., Univ. of Illinois, 1002 W. Green St., Urbana, IL 61801, USA
Eugene A. Magnier
Affiliation:
Astronomy Dept., Univ. of Washington, FM-20, Seattle, WA 98195, USA
Yuichi Kamata
Affiliation:
Nagoya University, Puro-cho, Chikusa-ku, Nagoya 464-01 Japan

Abstract

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We present ASCA SIS observations of the wind-blown bubble NGC 6888. Because the ASCA SIS is sensitive to higher energy photons and has a higher spectral resolution compared to the ROSAT PSPC, we are able to detect a T ≈ 8×106 K plasma component besides the T ≈ 1.5×106 K component known from previous PSPC observations. The existence of a high-temperature component, the observed limb-brightened X-ray surface brightness profile, and the observed level of X-ray surface brightness cannot be satisfactorily explained by currently available models. Reducing heat conduction at the contact discontinuity may raise the central temperature and produce a limb-brightening; however, the expected X-ray surface brightness is still considerably higher than the observed surface brightness.

Type
Part VII Gas in Superbubbles and in the Galactic Halo
Information
International Astronomical Union Colloquium , Volume 166: The Local Bubble and Beyond , 1997 , pp. 425 - 428
Copyright
Copyright © Springer-Verlag 1998

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