2005A&A...441..893A


Query : 2005A&A...441..893A

2005A&A...441..893A - Astronomy and Astrophysics, volume 441, 893-903 (2005/10-3)

The structural and scaling properties of nearby galaxy clusters. II. The M-T relation.

ARNAUD M., POINTECOUTEAU E. and PRATT G.W.

Abstract (from CDS):

Using a sample of ten nearby (z≲0.15), relaxed galaxy clusters in the temperature range [2-9]keV, we have investigated the scaling relation between the mass at various density contrasts (δ=2500,1000,500,200) and the cluster temperature. The masses are derived from NFW-type model fits to mass profiles, obtained under the hydrostatic assumption using precise measurements, with XMM-Newton, at least down to δ=1000. The logarithmic slope of the M-T relation is well constrained and is the same at all δ, reflecting the self-similarity of the mass profiles. At δ=500, the slope of the relation for the sub-sample of hot clusters (kT>3.5keV) is consistent with the standard self-similar expectation: α=1.49±0.15. The relation steepens when the whole sample is considered: α=1.71±0.09. The normalisation of the relation is discrepant (by ∼30 per cent), at all density contrasts, with the prediction from purely gravitation based models. Models that take into account radiative cooling and galaxy feedback are generally in better agreement with our data. We argue that remaining discrepancies, in particular at low δ, are more likely due to problems with models of the ICM thermal structure rather than to an incorrect estimate of the mass from X-ray data.

Abstract Copyright:

Journal keyword(s): cosmology: observations - cosmology: dark matter - galaxies: clusters: general - galaxies: intergalactic medium - X-rays: galaxies: clusters

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 ACO 2717 ClG 00 03 12.9 -35 56 13           ~ 129 0
2 ACO 478 ClG 04 13 20.7 +10 28 35           ~ 482 0
3 ClG 0745-19 ClG 07 47 31.3 -19 17 40           ~ 366 0
4 2MASX J07473129-1917403 BiC 07 47 31.3247085936 -19 17 40.013334276   19.60       ~ 399 1
5 ACO 1068 ClG 10 40 47.1 +39 57 19           ~ 193 0
6 ACO 1413 ClG 11 55 18.0 +23 24 19           ~ 399 0
7 ACO 1983 ClG 14 52 44.0 +16 44 46           ~ 237 1
8 ACO 1991 ClG 14 54 30.2 +18 37 51           ~ 315 1
9 BAX 233.1222+04.6817 ClG 15 32 29.3 +04 40 54     15.13     ~ 58 0
10 ACO 2204 ClG 16 32 45.7 +05 34 43           ~ 414 0
11 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 516 0

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2022.05.22-14:23:48

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