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Showing 1 to 1 of 1 for “"Aktive Galaxienkerne"”.
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X-ray and optical properties of X-ray luminous active galactic nuclei
Giacconi et al. (1962) discovered a diffuse cosmic X-ray background with rocket experiments when they searched for lunar X-ray emission. Later satellite missions found a spectral peak in the cosmic X-ray background at ~30 keV. Imaging X-ray satellites such as ROSAT (1990-1999) were able to resolve …