Implications of the BOOMERANG and MAXIMA-I results for the Baryon Mass Fraction in Clusters of galaxies
نویسنده
چکیده
Recent BOOMERANG and MAXIMA-I analyses of the angular power spectrum of the Cosmic Microwave Background put more stringent constraints on the cosmological parameters. I show that these constraints are consistent with the observed baryon budget in clusters of galaxies, allowing any further contribution to this budget from baryons not in stars and not X-ray emitting to be less than 14 per cent at the 90 per cent level of confidence.
منابع مشابه
Cosmology from Cosmic Microwave Background and Galaxy Clusters
We present the results of analysis of constraints on cosmological parameters from cosmic microwave background (CMB) alone and in combination with galaxy cluster baryon fraction assuming inflation–generated adiabatic scalar fluctuations. The CMB constraints are obtained using our likelihood approximation method (Bartlett et al., 2000, Douspis et al., 2001). In the present analysis we use the new...
متن کاملScaling relations in dynamical evolution of star clusters
We have carried out a series of small scale collisional N-body calculations of single-mass star clusters to investigate the dependence of the lifetime of star clusters on their initial parameters. Our models move through an external galaxy potential with a logarithmic density profile and they are limited by a cut-off radius. In order to find scaling relations between the lifetime of star cluste...
متن کاملThe halo by halo missing baryon problem
The global missing baryon problem — that the sum of observed baryons falls short of the number expected form BBN — is well known. In addition to this, there is also a local missing baryon problem that applies to individual dark matter halos. This halo by halo missing baryon problem is such that the observed mass fraction of baryons in individual galaxies falls short of the cosmic baryon fractio...
متن کاملEinstein Observatory evidence for the widespread baryon overdensity in clusters of galaxies
We analyse the X-ray surface brightness profiles of 19 moderately distant and luminous clusters of galaxies observed with the Einstein Observatory . Our aim is to determine cluster gas masses out to radii between 1 and 3 Mpc, and to confirm the apparent conflict, if Ω0 = 1, between the current calculations of the mean baryon fraction of the Universe expected from standard primordial nucleosynth...
متن کاملAstronomy and Astrophysics Cosmology from Cosmic Microwave Background and Galaxy Clusters
We present the results of analysis of constraints on cosmological parameters from cosmic microwave background (CMB) alone and in combination with galaxy cluster baryon fraction assuming inflation– generated adiabatic scalar fluctuations. The CMB constraints are obtained using our likelihood approximation method (Bartlett et al., 2000, Douspis et al., 2001). In the present analysis we use the ne...
متن کامل