2007MNRAS.380.1521M

Query : 2007MNRAS.380.1521M

2007MNRAS.380.1521M - Mon. Not. R. Astron. Soc., 380, 1521-1532 (2007/October-1)

Entropy profiles in X-ray luminous galaxy clusters at z > 0.1.

MORANDI A. and ETTORI S.

Abstract (from CDS):

The entropy distribution of the intracluster gas reflects both accretion history of the gas and the processes of feedback which provide a further non-gravitational energy besides the potential one. In this work, we study the profiles and the scaling properties of the gas entropy in 24 hot (kTgas> 6 keV) galaxy clusters observed with Chandra in the redshift range 0.14-0.82 and showing different states of relaxation. We recover the gas density, temperature and entropy profiles in a non-parametric way, just relying on the assumption of a spherically symmetric emission in the deprojection of the best-fitting results of the spatially resolved X-ray spectral analysis. Adding the hydrostatic equilibrium hypothesis, radial profiles are also obtained from the deprojection of the surface brightness, allowing to verify whether the hydrostatic equilibrium is a tenable hypothesis by comparison with the spectral measurements. We confirm that this is the case on scales larger than 100 kpc and discuss the deviations observed in a few non-cooling core clusters in the inner regions. We show that the entropy profiles are remarkably similar outside the core and can be described by simple power laws with slope of 1.0-1.2. We measure an entropy level at 0.1R200 of 100-500keVcm2 and a central plateau which spans a wide range of value (approximately a few -200keVcm2) depending on the state of relaxation of the source. The entropy values resolved at a given fraction of the virial radius are proportional to the gas temperature in these hot systems and appear larger at higher redshift once they are compared to the local estimates. To characterize the energetic of the central regions, we compare the radial behaviour of the temperature of the gas with the temperature of the dark matter (DM) TDM by estimating the excess of energy ΔE = 3/2k(Tgas-TDM). We point out that ΔE ranges from ~0 in typical cooling-core clusters to a few keV within 100 kpc in non-cooling-core systems. We also measure a significant correlation between the total iron mass and the entropy outside the cooling region, whereas in the inner regions they anticorrelate strongly. We find that none of the current models in literature on the extra-gravitational energy is able to justify alone the evidences we obtained on the entropy, metallicity and gas plus DM temperature profiles.

Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS

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

Simbad objects: 25

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Number of rows : 25
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 502 0
2 ACO 370 ClG 02 39 50.5 -01 35 08           ~ 747 0
3 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 2258 1
4 ACO 520 ClG 04 54 10.1 +02 55 38           ~ 436 0
5 ClG 0451-03 ClG 04 54 10.9 -03 01 07     20.0     ~ 352 0
6 ACO 611 ClG 08 00 58.7 +36 02 49           ~ 258 0
7 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 437 0
8 ACO 697 ClG 08 42 57.6 +36 21 45           ~ 253 0
9 ACO 773 ClG 09 17 51.3 +51 43 20           ~ 295 0
10 ZwCl 1021+0426 ClG 10 23 39.0 +04 11 14   15.6 17.95     ~ 283 0
11 ClG 1054-03 ClG 10 57 00.2 -03 37 27     22     ~ 454 0
12 ClG 1137+66 ClG 11 40 23.0 +66 08 16     21.0     ~ 138 0
13 ACO 1413 ClG 11 55 12.87 +23 23 46.9           ~ 430 0
14 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1125 0
15 ClG J1347-1145 ClG 13 47 30.5 -11 45 07           ~ 548 0
16 ZwCl 1358+6245 ClG 13 59 54.3 +62 30 36     18.5     ~ 361 0
17 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 689 1
18 ACO 1914 ClG 14 26 03.32 +37 49 58.7           ~ 314 0
19 ACO 1995 ClG 14 52 55.0 +58 02 59           ~ 130 0
20 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 563 0
21 ACO 2204 ClG 16 32 45.7 +05 34 43           ~ 436 0
22 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 809 1
23 ACO 2261 ClG 17 22 26.9 +32 07 58           ~ 342 0
24 ACO 2390 ClG 21 53 37.4 +17 41 46           ~ 688 2
25 BAX 337.1433+20.6131 ClG 22 28 32.6 +20 37 08           ~ 117 0

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