J. Pietz | Researchain

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International Astronomical Union Colloquium | 1997

High-velocity clouds and their soft X-ray emission

J. Kerp; J. Pietz; Peter M. W. Kalberla; W. B. Burton; R. Egger; Michael J. Freyberg; Dap Hartmann; U. Mebold

Diffuse excess 1/4 keV soft X-ray emission was found to be positionally correlated with the column density distribution of the high velocity cloud (HVC) complex C (Kerp et al. 1996). Here we point out that the detected diffuse X-ray emission is indeed associated with the HVC phenomenon. For this purpose we study the 1/4 keV radiation transfer as well as the HI column density distribution of HVCs and intermediate velocity clouds (IVCs) towards HVC complex C in detail. We present evidence that on arcmin scales the 3/4 keV soft X-ray emission is positionally anticorrelated with the HVC column density distribution of an individual HVC filament of complex C.

Advances in Space Research | 1995

The interaction of high-velocity-clouds with the galactic disk

J. Kerp; H. Lesch; K.-H. Mack; J. Pietz

Abstract Recently /1/ presented evidence for enhanced soft X-ray emission associated with a high-velocity-cloud (HVC). We now present additional observational results which indicate that the X-ray emission is indeed produced by the impact of the HVC onto the galactic disk. Moreover, we present first estimations about the energy budget of the interaction area.

Astronomy and Astrophysics | 1998