Results 191 to 200 of about 1,900,476 (219)
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Metals in the Intergalactic Medium
Astrophysics and Space Science, 2001The absorption lines seen in the spectra of quasars trace gas over a very large range of over densities, from galaxies to voids and probably account for most of the baryons at high redshift. Once thought to be a chemically pristine remnant of the Big Bang, the Lyman alpha forest has now been shown to contain significant quantities of metals.
Max Pettini +5 more
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Cosmology with the intergalactic medium
Pramana, 1999We discuss a few new results which points out the importance of the intergalactic medium as a diagnostic for the formation and evolution of galaxies in the Universe. We discuss the recent studies to determine the power spectrum of fluctuation from QSO-absorption line studies, and then some feedback processes from early galaxies which influence the ...
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Heating of the Intergalactic Medium
The Astrophysical Journal, 1999Using the cosmic virial theorem, Press-Schechter analysis, and numerical simulations, we compute the expected X-ray background (XRB) from the diffuse intergalactic medium (IGM) with the clumping factor expected from gravitational shock heating. The predicted fluxes and temperatures are ruled out by the observed XRB.
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1990
A critical review of the possible existence of a hot (T≥ l08 K) diffuse intergalactic medium (IGM) is given. Attention is paid to three main issues: its contribution to the X-ray background (XRB) by bremsstrahlung radiation, the Compton upscattering of the microwave background radiation (MBR) and the degree of dumpiness of the IGM. It is concluded that
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A critical review of the possible existence of a hot (T≥ l08 K) diffuse intergalactic medium (IGM) is given. Attention is paid to three main issues: its contribution to the X-ray background (XRB) by bremsstrahlung radiation, the Compton upscattering of the microwave background radiation (MBR) and the degree of dumpiness of the IGM. It is concluded that
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The dynamics of the intergalactic medium
Astrophysics and Space Science, 1982It is assumed that the intergalactic medium contains fully ionized plasmas. A detailed discussion shows that it is necessary to distinguish between medium-density and low-density plasmas before we can carry out any analysis. The conditions are very critical for the conclusions and application of any mechanism one likes to discuss for the intergalactic ...
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The Intergalactic Medium Family
2019We now move into the Family of the intergalactic medium, consisting of both gas and dust. Intergalactic gas is a hot, highly rarefied plasma consisting primarily of ionized hydrogen, along with traces of other elements such as helium and oxygen. It has been detected at temperatures ranging from 300,000 to five million degrees Celsius.
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Lyman-α transmission properties of the intergalactic medium in the CoDaII simulation
Monthly Notices of the Royal Astronomical Society, 2021Gustavo Yepes +2 more
exaly
Weighing cosmic structures with clusters of galaxies and the intergalactic medium
Monthly Notices of the Royal Astronomical Society, 2022Stefano Borgani +2 more
exaly