2010MNRAS.406..354O

Query : 2010MNRAS.406..354O

2010MNRAS.406..354O - Mon. Not. R. Astron. Soc., 406, 354-367 (2010/July-3)

Central galaxy growth and feedback in the most massive nearby cool core cluster.

OGREAN G.A., HATCH N.A., SIMIONESCU A., BOHRINGER H., BRUGGEN M., FABIAN A.C. and WERNER N.

Abstract (from CDS):

We present multiwavelength observations of the centre of RXCJ1504.1 - 0248 - the galaxy cluster with the most luminous and relatively nearby cool core at z ∼ 0.2. Although there are several galaxies within 100kpc of the cluster core, only the brightest cluster galaxy (BCG), which lies at the peak of the X-ray emission, has blue colours and strong line-emission. Approximately 80M☉/yr of intracluster gas is cooling below X-ray-emitting temperatures, similar to the observed ultraviolet star formation rate of ∼ 140M☉/yr. Most star formation occurs in the core of the BCG and in a 42-kpc-long filament of blue continuum, line emission and X-ray emission, that extends south-west of the galaxy.

The surrounding filamentary nebula is the most luminous around any observed BCG. The number of ionizing stars in the BCG is barely sufficient to ionize and heat the nebula, and the line ratios indicate that an additional heat source is needed. This heat source can contribute to the Hα-deduced star formation rates (SFRs) in BCGs and therefore the derived SFRs should only be considered upper limits.

AGN feedback can slow down the cooling flow to the observed mass deposition rate if the black hole accretion rate is of the order of 0.5M☉/yr at 10 per cent energy output efficiency.

The average turbulent velocity of the nebula is vturb∼ 325 km/s which, if shared by the hot gas, limits the ratio of turbulent to thermal energy of the intracluster medium to less than 6 per cent.


Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: RXCJ1504.1-0248

CDS comments: BCG = LEDA 126345, B1: SDSS J150408.15-024811.9, B2: not found, B3: SDSS J150407.27-024809.9, B4: SDSS J150406.49-024803.6, B5: SDSS J150406.20-024816.9, B6: SDSS J150407.05-024837.9

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ACO 426 ClG 03 19 47.6 +41 30 54           ~ 2508 1
2 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
3 CD-34 6792 PM* 10 32 13.6185546336 -35 37 41.711776068   12.84 11.84     F:wl: 158 0
4 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
5 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 727 1
6 ACO 1836 ClG 14 01 42.0 -11 36 20           ~ 84 0
7 SDSS J150406.19-024816.9 BiC 15 04 06.1998913200 -02 48 16.904246544           ~ 7 0
8 SDSS J150406.49-024803.6 GiC 15 04 06.499 -02 48 03.68           ~ 2 0
9 SDSS J150407.05-024837.9 GiC 15 04 07.0537558056 -02 48 37.975174200           ~ 2 0
10 SDSS J150407.27-024810.0 GiC 15 04 07.2789067632 -02 48 10.012041252           ~ 2 0
11 ClG J1504-0248 ClG 15 04 07.4 -02 48 15           ~ 186 0
12 [VV2006] J150407.5-024816 Bla 15 04 07.51896914 -02 48 16.6232484   18.53 18.08     ~ 60 2
13 SDSS J150408.15-024811.9 GiC 15 04 08.153 -02 48 11.92           ~ 1 0
14 CD-38 10980 WD* 16 23 33.8380498896 -39 13 46.161043572 9.916 10.885 11.029 10.936 10.841 DA2 526 0
15 NAME LHB X 16 42.0 +02 19           ~ 414 0

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