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Astron. Astrophys. 344, 333-341 (1999)


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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)

© European Southern Observatory (ESO) 1999

Online publication: March 10, 1999

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