Question

What are Intergalactic gases?​

Answer 1

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The intergalactic medium is the hot, X-ray emitting gas that permeates the space between galaxies. .Thought to be driven by either starbursts or active galactic nuclei, these are streams of highly-charged particles (including metals) that are often seen blowing out of galaxies.

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Answer 2

Answer:

The intergalactic medium is the hot, X-ray emitting gas that permeates the space between galaxies. ... Thought to be driven by either starbursts or active galactic nuclei, these are streams of highly-charged particles (including metals) that are often seen blowing out of galaxies.

At one time it was thought that large amounts of mass might exist in the form of gas clouds in the spaces between galaxies. One by one, however, the forms that this intergalactic gas might take were eliminated by direct observational searches until the only possible form that might have escaped early detection was a very hot plasma. Thus, there was considerable excitement and speculation when astronomers found evidence in the early 1970s for a seemingly uniform and isotropic background of hard X radiation (photons with energies greater than 106 electron volts). There also was a diffuse background of soft X rays, but this had a patchy distribution and was definitely of galactic origin—hot gas produced by many supernova explosions inside the Milky Way Galaxy. The hard X-ray background, in contrast, seemed to be extragalactic, and a uniform plasma at a temperature of roughly 108 kelvins (K) was a possible source. The launch in 1978 of an imaging X-ray telescope aboard the Einstein Observatory (the HEAO 2 satellite), however, showed that a large fraction of the seemingly diffuse background of hard X rays, perhaps all of it, could be accounted for by a superposition of previously unresolved point sources—i.e., quasars. Subsequent research demonstrated that the shape of the X-ray spectrum of these objects at low redshifts does not match that of the diffuse background. The residual background has since been found to be from active galactic nuclei at higher redshifts...

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