2006MNRAS.367.1121P


C.D.S. - SIMBAD4 rel 1.7 - 2020.06.02CEST04:39:11

2006MNRAS.367.1121P - Mon. Not. R. Astron. Soc., 367, 1121-1131 (2006/April-2)

Heating rate profiles in galaxy clusters.

POPE E.C.D., PAVLOVSKI G., KAISER C.R. and FANGOHR H.

Abstract (from CDS):

In recent years, evidence has accumulated suggesting that the gas in galaxy clusters is heated by non-gravitational processes. Here, we calculate the heating rates required to maintain a physically motivated mass flow rate, in a sample of seven galaxy clusters. We employ the spectroscopic mass deposition rates as an observational input along with temperature and density data for each cluster. On energetic grounds, we find that thermal conduction could provide the necessary heating for A2199, Perseus, A1795 and A478. However, the suppression factor of the classical Spitzer value is a different function of radius for each cluster. Based on the observations of plasma bubbles, we also calculate the duty cycles for each active galactic nucleus (AGN), in the absence of thermal conduction, which can provide the required energy input. With the exception of Hydra-A, it appears that each of the other AGNs in our sample requires duty cycles of roughly 106-107 yr to provide their steady-state heating requirements. If these duty cycles are unrealistic, this may imply that many galaxy clusters must be heated by very powerful Hydra-A type events interspersed between more frequent smaller scale outbursts. The suppression factors for the thermal conductivity required for combined heating by AGN and thermal conduction are generally acceptable. However, these suppression factors still require `fine-tuning' of the thermal conductivity as a function of radius. As a consequence of this work, we present the AGN duty cycle as a cooling flow diagnostic.

Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): hydrodynamics - galaxies: active - galaxies: clusters: general - cooling flows

Status at CDS:  

Simbad objects: 9

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Number of rows : 9

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 426 ClG 03 19 47.2 +41 30 47           ~ 1931 1
2 ACO 478 ClG 04 13 20.7 +10 28 35           ~ 466 0
3 NAME Hya A LIN 09 18 05.651 -12 05 43.99   14.38 14.8     ~ 902 1
4 ACO 780 ClG 09 18 30 -12 15.7           ~ 425 0
5 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5794 0
6 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1150 0
7 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1097 1
8 NAME Cyg A Sy2 19 59 28.35645829 +40 44 02.0966496   16.22 15.10     ~ 2101 2
9 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 490 0

    Equat.    Gal    SGal    Ecl

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2020.06.02-04:39:11

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