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Astron. Astrophys. 344, 333-341 (1999)
On the X-ray haloes of the Galaxy and the Local Group and the diffuse soft X-ray background
S.D. Sidher 1,2,
T.J. Sumner 1 and
J.J. Quenby 1
1 Astrophysics Group, Blackett Laboratory, Imperial College of Science, Technology and Medicine, London SW7 2BZ, England, UK
2 Space Science Department, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, England, UK
Received 15 January 1998 / Accepted 10 December 1998
Abstract
We have extended the spectral modelling of the soft X-ray background (SXRB) using the ROSAT PSPC data along several lines of galactic longitude. Our results continue to demonstrate the need for a Galactic halo component, which is shown to vary markedly as a function of position. These fluctuations significantly affect the ability to investigate variations in the extragalactic SXRB below 2 keV. Our conclusions do not support the proposal of an X-ray halo surrounding the Local Group of galaxies as invoked by Suto et al. (1996).
Application of the 3 component model to a deep ROSAT observation in the direction of the Lockman hole is also discussed.
Key words: X-rays:
ISM 
ISM: structure
ISM: individual objects: Draco
complex
ISM: clouds
ISM: general
Send offprint requests to: S.D. Sidher (sds@astro1.bnsc.rl.ac.uk)
Contents
- 1. Introduction
- 2. Spectral model
- 3. Data analysis
- 4. The Lockman hole
- 5. Conclusions
- Acknowledgements
- References
© European Southern Observatory (ESO) 1999
Online publication: March 10, 1999
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