The observed X-ray background is thought to result from, at the "soft" end (below 0.3 keV), Galactic X-ray emission, and, at the "hard" end, from a combination of many unresolved X-ray sources outside of the Milky Way .

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  • The observed X-ray background is thought to result from, at the "soft" end (below 0.3 keV), Galactic X-ray emission, and, at the "hard" end, from a combination of many unresolved X-ray sources outside of the Milky Way . The X-ray background is occulted by the dark side of the Moon. 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 and obscured active galactic nuclei (AGN). (en)
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  • The observed X-ray background is thought to result from, at the "soft" end (below 0.3 keV), Galactic X-ray emission, and, at the "hard" end, from a combination of many unresolved X-ray sources outside of the Milky Way . (en)
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  • X-ray background (en)
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