Results 221 to 230 of about 32,240 (255)
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Baryons in the Diffuse Intergalactic Medium
Space Science Reviews, 2002The baryon density of the universe Ω B is well measured indirectly from Big-Bang nucleo-synthesis, in particular by recent measurements of the D/H ratio in high-redshift QSO absorption systems. In addition, very recent measurements of the second maximum of the power-spectrum of the CMB fine scale anisotropy allow to constrain Ω B at z ≈ 1000.
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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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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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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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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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Construction of Medium-Sized Rings by Gold Catalysis
Chemical Reviews, 2021Ronald L Reyes +2 more
exaly
Direct observation of chemical short-range order in a medium-entropy alloy
Nature, 2021Xuefei Chen, Qi Wang, Zhiying Cheng
exaly