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2003MNRAS.340..989S - Mon. Not. R. Astron. Soc., 340, 989-1010 (2003/April-2)
The Birmingham-CfA cluster scaling project - I. Gas fraction and the M -T Xrelation.
SANDERSON A.J.R., PONMAN T.J., FINOGUENOV A., LLOYD-DAVIES E.J. and MARKEVITCH M.
Abstract (from CDS):
We derive a mean logarithmic slope of the M -TX relation within R200of 1.84±0.06, although there is some evidence of a gradual steepening in the M -TXrelation, with decreasing mass. We recover a similar slope using two additional methods of calculating the mean temperature. Repeating the analysis with the assumption of isothermality, we find the slope changes only slightly, to 1.89±0.04, but the normalization is increased by 30 per cent. Correspondingly, the mean gas fraction within R200 changes from (0.13±0.01)h–3/270^ to (0.11±0.01)h–3/270^, for the isothermal case, with the smaller fractional change reflecting different behaviour between hot and cool systems. There is a strong correlation between the gas fraction within 0.3R200 and temperature. This reflects the strong (5.8σ) trend between the gas density slope parameter, β, and temperature, which has been found in previous work.
These findings are interpreted as evidence for self-similarity breaking from galaxy feedback processes, active galactic nuclei heating or possibly gas cooling. We discuss the implications of our results in the context of a hierarchical structure formation scenario.
Abstract Copyright: 2003 RAS
Journal keyword(s): galaxies: clusters: general - galaxies: haloes - intergalactic medium - X-rays: galaxies - X-rays: galaxies: clusters
Simbad objects: 71
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