Soft X-rays from the Galaxy as seen with ROSAT

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Scientific paper

A short report on progress in X-ray analysis of the Milky Way on the whole is given. Specifically, we want to investigate the galactic distribution of hot gas and to identify bubbles and super-bubbles, their interaction, etc. In this study of the galactic diffuse X-ray background up to 1 keV ROSAT PSPC All-Sky Survey data in 7 energy bands with 12' resolution have been used. In the soft 1/4 keV band besides a local component (Local Bubble, T_l 10^{6.0} K) also distant emission can be identified. Derived distant intensities Id and temperatures Td vary across the sky, the North Galactic Pole region seems to be a factor of 3 brighter than the southern antipode. At the galactic poles for the temperatures Td Tl is found. Analysis of the 3/4 keV band yields higher temperatures Td for the distant component. These discrepancies could point toward different origins of the emission, but could also indicate that other assumptions may be not valid, e.g., slab model (emission behind all absorbing material vs. interspersed emission/absorption), single temperature, collisional ionization equilibrium etc.

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