Results 181 to 190 of about 1,962,001 (214)

The Ionized Intergalactic Gas: Baryonic Dark Matter

Astrophysics and Space Science, 2001
We use Ha measurements of complete sets of H II regions in disc galaxies to compute the fraction of ionizing photons which escape from them using the hypothesis of density bounding. The escaping flux is more than enough to ionize the observed diffuse ionized gas (DIG) and the balance implies that an important fraction of the flux escapes into the ...
A. Zurita, M. Rozas, J.E. Beckman, S. Ryder   +3 more
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Ionization and Abundances of Intergalactic Gas

1995
We will briefly present four results — three from the W.M. Keck telescope, and one from the HST — on the abundances and ionization of the Lyman-alpha forest clouds and the intergalactic medium at high redshift. For the first time we have sufficient signal to noise to clearly see the velocity profiles of the Lyα forest lines. Most are Voigt, with little
David Tytler, Xiao-Ming Fan, Scott Burles, Lance Cottrell, Christopher Davis, David Kirkman, Lin Zuo   +6 more
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On the Intergalactic Gas in the Local Group of Galaxies

Publications of the Astronomical Society of Japan, 1971
Abstract The intergalactic ionized gas in the groups and clusters of galaxies is considered. Assuming equipartition among several modes of energy in a system, and taking into account the gravitational potential between the intergalactic gas and the member galaxies, we obtain the following revised results for the Local Group: the mass of ...
Pierre Chamaraux, Masaru Tadokoro
openaire   +1 more source

The thermal history of the intergalactic medium [PDF]

Monthly Notices of the Royal Astronomical Society, 2000
At redshifts z ≳ 2, most of the baryons reside in the smooth intergalactic medium which is responsible for the low column density Lyα forest. This photoheated gas follows a tight temperature–density relation which introduces a cut-off in the distribution
Joop Schaye, Tom Theuns, Wallace L W Sargent   +2 more
exaly   +2 more sources

Intergalactic gas bridge ahoy

New Scientist, 2012
A third of the universe's normal matter is AWOL – maybe it has spun into links between the ...
openaire   +1 more source

Diffuse Intergalactic Gas

1998
The physical properties of the diffuse intergalactic gas is one of the more tantalising problems of modern cosmology. It is certain that there is diffuse intergalactic gas in rich clusters of galaxies as is indicated by the observation of intense Xray bremsstrahlung at a temperature of about 108 K from clusters such as the Coma and Perseus clusters ...
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Intergalactic and Extended Atomic Gas

1993
Observational results are discussed on the properties of the diffuse atomic gas in the outer parts of galaxies and between galaxies. In the local universe, no H I in emission is found at column densities less than about 1019 cm-2, possibly because the lower column density gas is mostly ionized.
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Feeding of Intergalactic Gas Clouds onto Elliptical Galaxies

Publications of the Astronomical Society of Japan, 1992
Abstract Due to ram-pressure braking, intergalactic H I clouds such as tidal debris from galaxies are captured and accreted by an elliptical galaxy which is embedded in a hot gaseous halo. The captured clouds are rapidly accreted toward the central region along spiral orbits, and play a role in feeding the nucleus.
Yoshiaki Sofue, Ken-ichi Wakamatsu
openaire   +1 more source

Compression of a gas cloud by pressure of the intergalactic medium

Astrophysics, 1987
It is shown that the evolution of an interstellar gas cloud that enters the space between galaxies depends strongly on the pressure of the hot intergalactic medium. If the difference between the pressure P/sub 0/ of the cloud and the ambient hot gas P/sub ext/ is large (P/sub ext//P/sub 0/ approx.
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Extent of hot intergalactic gas in the cluster Abell 2218

Nature, 1978
A SMALL cooling of the microwave background towards the centre of the rich, distant cluster of galaxies Abell 2218 has been detected1–3. This decrement has been attributed to the inverse Compton scattering of photons of the background radiation by electrons in a hot intracluster plasma, as predicted by Sunyaev and Zel'dovich4.
M. BIRKINSHAW, S. F. GULL, K. J. E. NORTHOVER   +2 more
openaire   +1 more source