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X-ray background

The observed X-ray background is thought to result from, at the 'soft' end (below 0.3 keV), galactic X-ray emission, the 'galactic' X-ray background, and, at the 'hard' end (above 0.3keV), from a combination of many unresolved X-ray sources outside of the Milky Way, the 'cosmic' X-ray background (CXB). The observed X-ray background is thought to result from, at the 'soft' end (below 0.3 keV), galactic X-ray emission, the 'galactic' X-ray background, and, at the 'hard' end (above 0.3keV), from a combination of many unresolved X-ray sources outside of the Milky Way, the 'cosmic' X-ray background (CXB). The galactic X-ray background is produced largely by emission from hot gas in the Local Bubble within 100 parsecs of the Sun. Deep surveys with X-ray telescopes, such as the Chandra X-ray Observatory, have demonstrated that around 80% of the cosmic X-ray background is due to resolved extra-galactic X-ray sources, the bulk of which are unobscured ('type-1') and obscured ('type-2') active galactic nuclei (AGN).

[ "Active galactic nucleus", "Background radiation", "Quasar" ]
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