Soft X-rays from High-Velocity Clouds

Details Soft X-rays from High-Velocity Clouds Soft X-rays from High-Velocity Clouds

1998-11-27

arxiv.org/abs/astro-ph/9811433v1

Astronomy and Astrophysics

Astrophysics

3 pages, 5 figures, to be published in "Highlights in X-ray Astronomy" in honour of Joachim Truemper's 65th birthday

Scientific paper

The ROSAT mission gave us the unique possibility to study the galactic interstellar medium by ``shadowing'' observations on arcmin angular resolution level. The high sensitivity of the ROSAT PSPC in combination with the large field of view allows the detailed study of individual clouds, while the ROSAT all-sky survey is the main source for studies of the large-scale intensity distribution of the diffuse soft X-ray emission. We show that neutral hydrogen clouds are associated with soft X-ray emission, E(X-ray) < 3/4 keV. These neutral hydrogen clouds, known as high-velocity clouds (HVCs), are located partly within the galactic halo, and partly in intergalactic space. The ROSAT detection of soft X-ray emission from some of these HVCs is the first detection of HVCs in emission other than HI 21-cm line radiation.

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