2008ApJ...683L.107C

Query : 2008ApJ...683L.107C

2008ApJ...683L.107C - Astrophys. J., 683, L107-L110 (2008/August-3)

An entropy threshold for strong Hα and radio emission in the cores of galaxy clusters.

CAVAGNOLO K.W., DONAHUE M., VOIT G.M. and SUN M.

Abstract (from CDS):

Our Chandra X-Ray Observatory archival study of intracluster entropy in a sample of 222 galaxy clusters shows that Hα and radio emission from the brightest cluster galaxy are much more pronounced when the cluster's core gas entropy is ≲30 keV cm2. The prevalence of Hα emission below this threshold indicates that it marks a dichotomy between clusters that can harbor multiphase gas and star formation in their cores and those that cannot. The fact that strong central radio emission also appears below this boundary suggests that AGN feedback turns on when the intracluster medium starts to condense, strengthening the case for AGN feedback as the mechanism that limits star formation in the universe's most luminous galaxies.

Abstract Copyright: ∼

Journal keyword(s): Conduction - Galaxies: Cooling Flows - Galaxies: Active - Galaxies: Clusters: General - Galaxies: Evolution - X-Rays: Galaxies: Clusters

Simbad objects: 28

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Number of rows : 28
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 ClG J0011-2850 ClG 00 11 21.623 -28 51 14.44           ~ 7 0
2 ACO 133 ClG 01 02 41.5 -21 52 53           ~ 391 1
3 Z 385-64 BLL 01 18 53.6237165304 -01 00 07.248153600   15.0       ~ 81 1
4 ACO 193 ClG 01 25 07.3 +08 41 36           ~ 192 0
5 2A 0251+413 ClG 02 54 26.6 +41 33 25           ~ 328 1
6 BAX 055.3242+15.3961 ClG 03 41 16.9 +15 24 27           ~ 45 0
7 ACO S 405 ClG 03 51 32.8 -82 13 15           ~ 50 0
8 BAX 064.9080+02.4099 GrG 04 19 38.2 +02 25 12           ~ 44 1
9 ClG 0422-09 ClG 04 25 51.02 -08 33 38.5           ~ 97 0
10 ClG 0440+02 ClG 04 43 09.7 +02 10 19     17.03     ~ 129 0
11 MCG-03-13-025 BiC 04 54 52.262 -18 06 56.12   13.34   11.64   ~ 66 1
12 CAN 28 ClG 04 54 52.318 -18 06 56.52           ~ 32 0
13 ACO 539 ClG 05 16 35.1 +06 27 14           ~ 255 2
14 ACO 586 ClG 07 32 20.3 +31 37 58           ~ 196 0
15 ACO 780 ClG 09 18 30 -12 15.7           ~ 469 0
16 ZwCl 0949+5207 ClG 09 52 49.1 +51 53 05           ~ 141 0
17 ACO 1204 ClG 11 13 32.2 +17 35 40           ~ 101 0
18 ClG J1159+5531 ClG 11 59 53.02 +55 32 22.8     15.64     ~ 100 1
19 NAME NGC 4073 Group GrG 12 04 44.08 +01 48 40.9     13.53     ~ 292 0
20 ACO 3558 ClG 13 28 03.2 -31 31 35           ~ 476 2
21 ACO 2029 ClG 15 10 54.2 +05 44 23           ~ 1020 0
22 ACO 2063 ClG 15 23 01.8 +08 38 22           ~ 414 2
23 ACO 2107 ClG 15 39 39.04 +21 46 57.8           ~ 270 0
24 ACO 2147 ClG 16 02 11.96 +15 55 11.5           ~ 416 0
25 ACO 2151 ClG 16 05 15.0 +17 44 55           ~ 594 3
26 ACO 2244 ClG 17 02 40.33 +34 02 58.7           ~ 301 0
27 ACO 2556 ClG 23 13 03.3 -21 37 40           ~ 83 0
28 ACO 4038 ClG 23 47 31.1 -28 12 10           ~ 349 3

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