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Mapping Cool Gas in the ISM with ROSAT

Published online by Cambridge University Press:  12 April 2016

I.B. Hutchinson ,
R.S. Warwick  and
R. Willingale
I.B. Hutchinson
Affiliation:
Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, UK
R.S. Warwick
Affiliation:
Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, UK
R. Willingale
Affiliation:
Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, UK

Abstract

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We have investigated the distribution of cool gas within the local interstellar medium (<150 pc) using data derived from both the ROSAT X-ray and EUV all-sky surveys. The EUV/X-ray spectra for a sample of 89 white dwarf stars and 200 active late-type stars have been analysed to give an estimate of the gas column density along each object’s line of sight. In order to extend the sky coverage we have also included in the analysis 190 late-type stars detected only in the X-ray band. The derived NHI measurements confirm the size of the local low density bubble as typically 50-100 pc and also show that in the general direction of Loop I there is a substantial excess of absorption at a range of distances from 10-150 pc.

Type
Part V Magnetic Fields, Molecular Clouds, and Interstellar Bubbles
Information
International Astronomical Union Colloquium , Volume 166: The Local Bubble and Beyond , 1997 , pp. 283 - 286
Copyright
Copyright © Springer-Verlag 1998

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