The galactic X-ray background is produced largely by emission from hot gas in the Local Bubble within 100 parsecs of the Sun.
around Seyfert AGNs normally blocks lower energy photons from reaching us, but higher energy photons like hard X-rays should be detectable with Swift, providing information about the type objects that are responsible for the hard X-ray background.
There does in fact exist a diffuse X-ray background, which results from some combination of unresolved individual sources (QSOs, clusters, starbursts,...) and a truly diffuse IGM.
emitted by black holes in active galactic nucleus, or AGN for short, galaxy clusters, supernova remnants, stars, binary stars containing a white dwarf (cataclysmic variable stars), neutron star or a black hole (X-ray binaries), the X-ray background, ...
system bodies emit X-rays, the most notable being the Moon, although most of the X-ray brightness of the Moon arises from reflected solar X-rays. A combination of many unresolved X-ray sources is thought to produce the observed X-ray background, ...
made since then: the discoveries of interstellar extinction (the dimming of starlight) in the 1930's, of polarization by interstellar dust grains in 1949, of 21-centimeter radio emission from atomic hydrogen in 1952, of the soft X-Ray background in ...
X-RAY BACKGROUND. A daily average background X-ray flux in the 1 to 8 angstrom range. It is a midday minimum designed to reduce the effects of FLAREs. X-RAY BURST. A temporary enhancement of the X-ray emission of the sun.
 See also: X-ray, Background, Ray, Energy, Rays
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