2010A&A...521A..64S

Query : 2010A&A...521A..64S

2010A&A...521A..64S - Astronomy and Astrophysics, volume 521, A64-64 (2010/10-1)

The evolution of cool-core clusters.

SANTOS J.S., TOZZI P., ROSATI P. and BOEHRINGER H.

Abstract (from CDS):

Cool-core clusters are characterized by strong surface brightness peaks in the X-ray emission from the Intra Cluster Medium (ICM). This phenomenon is associated with complex physics in the ICM and has been a subject of intense debate and investigation in recent years. The evolution of cool-cores is still poorly constrained because of the small sample statistics and the observational challenge of analysing high redshift clusters. In order to quantify the evolution in the cool-core cluster population, we robustly measure the cool-core strength in a local, representative cluster sample, and in the largest sample of high-redshift clusters available to date. We use high-resolution Chandra data of three representative cluster samples spanning different redshift ranges: (i) the low redshift sample from the 400 Square degree (SD) survey with median <z≥0.08; (ii) the high redshift sample from the 400 SD Survey with median <z≥0.59; and (iii) 15 clusters drawn from the Rosat Distant Cluster Survey and the Wide Angle Rosat Pointed Survey, with median <z≥0.83. Our analysis is based on the measurement of the surface brightness concentration, cSB (Santos et al., 2008A&A...483...35S), which allows us to characterize the cool-core strength in low signal-to-noise data. We also obtain gas density profiles to derive cluster central cooling times and entropy. In addition to the X-ray analysis, we search for radio counterparts associated with the cluster cores. We find a statistically significant difference in the cSB distributions of the two high-z samples, pointing towards a lack of concentrated clusters in the 400 SD high-z sample. Taking this into account, we confirm a negative evolution in the fraction of cool-core clusters with redshift, in particular for very strong cool-cores. This result is validated by the central entropy and central cooling time, which show strong anti-correlations with cSB. However, the amount of evolution is significantly smaller than previously claimed, leaving room for a large population of well formed cool-cores at z∼1. Finally, we explore the potential of the proposed X-ray mission Wide Field X-ray Telescope to detect and quantify cool-cores up to z=1.5.

Abstract Copyright: ∼

Journal keyword(s): X-rays: galaxies: clusters - galaxies: clusters: interacluster medium, galaxies: high-redshift

Simbad objects: 64

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Number of rows : 64
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 J0030+2618 ClG 00 30 33.6 +26 18 16           ~ 61 0
2 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 909 0
3 ACO 133 ClG 01 02 41.5 -21 52 53           ~ 368 1
4 ClG J0152-1358 ClG 01 52 41.3 -13 58 13           ~ 258 3
5 ClG J0216-1747 ClG 02 16 32.8 -17 47 11           ~ 14 0
6 ClG J0230+1836 ClG 02 30 26.6 +18 36 22           ~ 19 0
7 ACO 399 ClG 02 57 56.4 +13 00 59           ~ 396 0
8 ACO 401 ClG 02 58 56.9 +13 34 56           ~ 566 0
9 ACO 3112 ClG 03 17 52.4 -44 14 35           ~ 311 1
10 ClG J0328-2140 ClG 03 28 36.1 -21 40 04           ~ 19 0
11 ACO 3158 ClG 03 42 39.6 -53 37 50           ~ 304 0
12 ClG J0405-4100 ClG 04 05 24.3 -41 00 15           ~ 15 0
13 ACO 478 ClG 04 13 20.7 +10 28 35           ~ 502 0
14 ACO 3266 ClG 04 31 11.9 -61 24 23           ~ 410 0
15 ClG J0521-2530 ClG 05 21 10.5 -25 30 36           ~ 18 0
16 ClG J0542-4100 ClG 05 42 49.9 -40 59 58           ~ 62 0
17 ACO 3391 ClG 06 26 15.4 -53 40 52           ~ 202 1
18 ACO 3395 ClG 06 27 31.1 -54 23 58           ~ 209 0
19 ClG J0848+4453 ClG 08 48 34.800 +44 53 41.90           ~ 123 1
20 ClG J0849+4452 ClG 08 48 58.8 +44 51 53           ~ 107 1
21 NAME HYA SUPERCL SCG 08 57.9 +03 10           ~ 177 0
22 ACO 754 ClG 09 09 08.4 -09 39 58           ~ 666 1
23 ClG J0910+5422 ClG 09 10 44.9 +54 22 09           ~ 91 0
24 NAME Hya A LIN 09 18 05.66848602 -12 05 43.8060823   14.38 14.8     ~ 1012 1
25 ClG J0956+4107 ClG 09 56 03.4 +41 07 14           ~ 41 0
26 ACO 907 ClG 09 58 21.84 -11 03 47.5           ~ 129 0
27 ClG J1002+6858 ClG 10 02 07.7 +68 58 48           ~ 17 0
28 ACO 963 ClG 10 17 03.4 +39 02 56           ~ 400 0
29 ZwCl 1021+0426 ClG 10 23 39.0 +04 11 14   15.6 17.95     ~ 283 0
30 ClG J1113-2615 ClG 11 13 05.7 -26 15 36           ~ 35 0
31 ClG J1117+1744 ClG 11 17 30.2 +17 44 44           ~ 30 0
32 ClG J1120+4318 ClG 11 20 07.6 +43 18 07           ~ 60 0
33 ClG J1120+2326 ClG 11 20 57.9 +23 26 41           ~ 40 0
34 ClG 1137+66 ClG 11 40 23.0 +66 08 16     21.0     ~ 138 0
35 ClG J1202+5751 ClG 12 02 13.7 +57 51 53           ~ 14 0
36 ZwCl 1215+0400 ClG 12 17 43.62 +03 38 51.5           ~ 153 0
37 ClG J1221+4918 ClG 12 21 25.0 +49 18 07           ~ 58 0
38 ClG J1226+3332 ClG 12 26 57.7 +33 32 50           ~ 215 0
39 ClG J1252-2927 ClG 12 52 54.4 -29 27 17           ~ 156 0
40 ACO 1650 ClG 12 58 42.0 -01 45 45           ~ 304 0
41 ACO 1651 ClG 12 59 22.43 -04 11 47.1           ~ 290 0
42 ClG J1317+2911 ClG 13 17 21.70 +29 11 18.1           ~ 30 0
43 ZwCl 1332+5043 ClG 13 34 20.0 +50 30 54           ~ 41 0
44 ACO 1795 ClG 13 48 50.48 +26 35 07.4           ~ 1267 0
45 ClG J1350+6007 ClG 13 50 48.55 +60 07 06.7           ~ 44 0
46 ClG J1354-0221 ClG 13 54 16.9 -02 21 47           ~ 46 0
47 ClG J1357+6232 ClG 13 57 19.4 +62 32 42           ~ 19 0
48 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 689 1
49 ClG J1415+3611 ClG 14 15 11.1 +36 12 03           ~ 78 1
50 ClG J1504-0248 ClG 15 04 07.4 -02 48 15           ~ 175 0
51 ACO 2029 ClG 15 10 56.2 +05 44 42           ~ 943 0
52 ACO 2065 ClG 15 22 29.3 +27 42 22           ~ 374 0
53 ClG J1524+0957 ClG 15 24 40.3 +09 57 35           ~ 60 0
54 ACO 2142 ClG 15 58 14.38 +27 12 57.8           ~ 768 0
55 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 563 0
56 ACO 2204 ClG 16 32 45.7 +05 34 43           ~ 436 0
57 ACO 2244 ClG 17 02 40.33 +34 02 58.7           ~ 281 0
58 ACO 2256 ClG 17 03 09.4 +78 39 36           ~ 885 1
59 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 627 1
60 ACO 3822 ClG 21 54 06.2 -57 50 49           ~ 87 0
61 ClG J2235-2557 ClG 22 35 20.6 -25 57 42           ~ 147 0
62 ClG J2302+0844 ClG 23 02 48.1 +08 43 50           ~ 41 0
63 ACO S 1101 ClG 23 13 58.5 -42 43 39           ~ 258 1
64 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 539 0

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