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2003MNRAS.345.1241S - Mon. Not. R. Astron. Soc., 345, 1241-1254 (2003/November-2)
The Birmingham-CfA cluster scaling project - II. Mass composition and distribution.
SANDERSON A.J.R. and PONMAN T.J.
Abstract (from CDS):
We measure a median mass-to-light ratio of 249 h70(M/L)☉in the rest frame BJband, in good agreement with other measurements based on X-ray determined masses. There is no trend in M/L with X-ray temperature and no significant trend for mass to increase faster than luminosity: M ∝L 1.08±0.12_ BJ_. This implied lack of significant variation in star formation efficiency suggests that gas cooling cannot be greatly enhanced in groups, unless it drops out to form baryonic dark matter. Correspondingly, our results indicate that non-gravitational heating must have played a significant role in establishing the observed departure from self-similarity in low-mass systems. The median baryon fraction for our sample is 0.162 h –3/270, which allows us to place an upper limit on the cosmological matter density, Ωm≤ 0.27 h –170, in good agreement with the latest results from WMAP.
We find evidence of a systematic trend towards higher central density concentration in the coolest haloes, indicative of an early formation epoch and consistent with hierarchical formation models.
Abstract Copyright: 2003 RAS
Journal keyword(s): galaxies: clusters: general - intergalactic medium - X-rays: galaxies: clusters
Simbad objects: 35
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