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• W2002100632 endingPage "13" @default.
• W2002100632 startingPage "13" @default.
• W2002100632 abstract "It is believed that the global baryon content of clusters of galaxies is representative of the matter distribution of the universe, and can, therefore, be used to reliably determine the matter density parameter Omega_m. This assumption is challenged by the growing evidence from optical and X-ray observations that the total baryon mass fraction increases towards rich clusters. In this context, we investigate the dependence of stellar, and total baryon mass fractions as a function of mass. To do so, we used a subsample of nineteen clusters extracted from the X-ray flux limited sample HIFLUGCS that have available DR-7 Sloan Digital Sky Survey (SDSS) data. From the optical analysis we derived the stellar masses. Using XMM-Newton we derived the gas masses. Then, adopting a scaling relation we estimate the total masses. Adding the gas and the stellar mass fractions we obtain the total baryonic content that we find to increase with cluster mass, reaching 7-year Wilkinson Microwave Anisotropy Probe (WMAP-7) prediction for clusters with M_500 = 1.6 x 10^{15} M_sun. We observe a decrease of the stellar mass fraction (from 4.5% to ~1.0%) with increasing total mass where our findings for the stellar mass fraction agree with previous studies. This result suggests a difference in the number of stars formed per unit of halo mass, though with a large scatter for low-mass systems. That is, the efficiency of star formation varies on cluster scale that lower mass systems are likely to have higher star formation efficiencies. It follows immediately that the dependence of the stellar mass fraction on total mass results in an increase of the mass-to-light ratio from lower to higher mass systems. We also discuss the consequences of these results in the context of determining the cosmic matter density parameter Omega_m." @default.
• W2002100632 created "2016-06-24" @default.
• W2002100632 creator A5029762041 @default.
• W2002100632 creator A5030362872 @default.
• W2002100632 creator A5079108946 @default.
• W2002100632 creator A5088534137 @default.
• W2002100632 date "2011-11-18" @default.
• W2002100632 modified "2023-09-22" @default.
• W2002100632 title "XMM-NEWTON/SLOAN DIGITAL SKY SURVEY: STAR FORMATION EFFICIENCY IN GALAXY CLUSTERS AND CONSTRAINTS ON THE MATTER-DENSITY PARAMETER" @default.
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• W2002100632 doi "https://doi.org/10.1088/0004-637x/743/1/13" @default.
• W2002100632 hasPublicationYear "2011" @default.
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