2004MNRAS.347.1130V


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.27CEST09:36:03

2004MNRAS.347.1130V - Mon. Not. R. Astron. Soc., 347, 1130-1149 (2004/February-1)

Thermal conduction and reduced cooling flows in galaxy clusters.

VOIGT L.M. and FABIAN A.C.

Abstract (from CDS):

Conduction may play an important role in reducing cooling flows in galaxy clusters. We analyse a sample of 16 objects using Chandra data and find that a balance between electron conduction and cooling can exist in the hotter clusters (T ≳ 5 keV), provided that the plasma conductivity is close to the unhindered Spitzer value. In the absence of any additional heat sources, a reduced mass inflow must then develop in the cooler objects in the sample. We fit cooling flow models to deprojected spectra and compare the spectral mass deposition rates found to the values required to account for the excess luminosity, assuming Spitzer-rate heat transfer over the observed temperature gradients. The measured mass inflow rates are insufficient to maintain energy balance in at least five clusters. However, emission from cooling gas may be partially absorbed. We also compute the flux supplied by turbulent heat transport and find conductivity profiles that follow a strikingly similar temperature dependence to the conductivity values required to prevent cooling. The larger-scale turbulent motions implied by this process are required to have velocities of between 10 and 50 per cent of the speed of sound in the local intracluster gas.

Abstract Copyright: 2004 RAS

Journal keyword(s): conduction - galaxies: clusters: general - cooling flows - X-rays: galaxies

Status at CDS:  

Simbad objects: 20

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Number of rows : 20

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ACO 3112 ClG 03 17 52.4 -44 14 35           ~ 289 1
2 ZwCl 0335+0956 ClG 03 38 35.3 +09 57 54           ~ 342 1
3 ACO 478 ClG 04 13 20.7 +10 28 35           ~ 466 0
4 2MASX J07473129-1917403 BiC 07 47 31.296 -19 17 40.34   19.60       ~ 393 1
5 ClG 0745-19 ClG 07 47 31.3 -19 17 40           ~ 364 0
6 NAME Hya A LIN 09 18 05.651 -12 05 43.99   14.38 14.8     ~ 901 1
7 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6165 3
8 ClG J1347-1145 ClG 13 47 33.5 -11 45 42           ~ 463 0
9 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1150 0
10 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 620 1
11 IC 4374 QSO 14 07 29.76224452 -27 01 04.2931696   13.61   11.79   ~ 119 3
12 3C 295 Sy2 14 11 20.467 +52 12 09.52   22.34 20.80 18.54   ~ 892 5
13 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 850 0
14 LEDA 1900245 Bla 15 32 53.780 +30 20 59.41   19.1   15.7   ~ 127 0
15 ClG J1532+3021 ClG 15 32 53.8 +30 21 00           ~ 89 0
16 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1097 1
17 NAME Cyg A Cluster ClG 19 59 30.3 +40 44 11           ~ 132 0
18 ACO 2390 ClG 21 53 34.6 +17 40 11           ~ 624 2
19 ACO S 1101 ClG 23 13 58.5 -42 43 39           ~ 230 1
20 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 490 0

    Equat.    Gal    SGal    Ecl

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2020.05.27-09:36:03

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