The recent {\sl ROSAT \/} X-ray detections of hot intergalactic gas in three groups of galaxies are reviewed and the resulting baryonic fraction in these groups is reevaluated. We show that the baryonic fraction obtained, assuming hydrostatic equilibrium, should depend, perhaps sensitively, on the radius out to which the X-rays are detected, and the temperature profile of the gas. We find that the NGC 2300 group has a baryonic fraction out to $25'$ of at least 20\%, thus over five times higher than in the original analysis of Mulchaey \etal\ (1993), and also much higher than one would obtain from big-bang nucleosynthesis, but similar to the other two groups as well as rich clusters. With this baryonic fraction, groups would be fair tracers ...
New X-ray observations of the sparse NGC 3258 group of galaxies made by the ASCA satellite with good...
Traditionally, galaxy clusters have been expected to retain all the material accreted since their fo...
Elliptical galaxies and their groups having the largest L_x/L_B lie close to the locus in the L_x,L_...
Aims. Based on XMM-Newton, Chandra, and SDSS data, we investigate the baryon distribution ...
Most of the baryonic matter in the Universe is not locked in stars. Instead, groups and clusters of ...
International audienceWe investigate if the discrepancy between estimates of the total baryon mass f...
none5Aims. Several recent studies used the hot gas fraction of galaxy clusters as a standard ruler t...
In the Big Bang about 3% of the mass that was created was in the form of normal baryonic matter (neu...
Aims. Several recent studies used the hot gas fraction of galaxy clusters as a standard ruler to con...
The baryon fraction in clusters, combined with constr aints from primordial nucleosynthesis is curre...
International audienceTraditionally, galaxy clusters have been expected to retain all the material a...
We estimate the baryon mass density of the Universe due to the stars in and the hot gas in clusters ...
(Abridged) The nonlinear evolution of the system consisting of baryons and dark matter is generally ...
We present the results on the distribution of baryon matter in the galaxy clusters (z < 0.2), bas...
We analyse the X-ray surface brightness profiles of 19 moderately distant and luminous clusters of g...
New X-ray observations of the sparse NGC 3258 group of galaxies made by the ASCA satellite with good...
Traditionally, galaxy clusters have been expected to retain all the material accreted since their fo...
Elliptical galaxies and their groups having the largest L_x/L_B lie close to the locus in the L_x,L_...
Aims. Based on XMM-Newton, Chandra, and SDSS data, we investigate the baryon distribution ...
Most of the baryonic matter in the Universe is not locked in stars. Instead, groups and clusters of ...
International audienceWe investigate if the discrepancy between estimates of the total baryon mass f...
none5Aims. Several recent studies used the hot gas fraction of galaxy clusters as a standard ruler t...
In the Big Bang about 3% of the mass that was created was in the form of normal baryonic matter (neu...
Aims. Several recent studies used the hot gas fraction of galaxy clusters as a standard ruler to con...
The baryon fraction in clusters, combined with constr aints from primordial nucleosynthesis is curre...
International audienceTraditionally, galaxy clusters have been expected to retain all the material a...
We estimate the baryon mass density of the Universe due to the stars in and the hot gas in clusters ...
(Abridged) The nonlinear evolution of the system consisting of baryons and dark matter is generally ...
We present the results on the distribution of baryon matter in the galaxy clusters (z < 0.2), bas...
We analyse the X-ray surface brightness profiles of 19 moderately distant and luminous clusters of g...
New X-ray observations of the sparse NGC 3258 group of galaxies made by the ASCA satellite with good...
Traditionally, galaxy clusters have been expected to retain all the material accreted since their fo...
Elliptical galaxies and their groups having the largest L_x/L_B lie close to the locus in the L_x,L_...