2011A&A...532A.123R


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST20:56:07

2011A&A...532A.123R - Astronomy and Astrophysics, volume 532A, 123-123 (2011/8-1)

Back and forth from cool core to non-cool core: clues from radio halos.

ROSSETTI M., ECKERT D., CAVALLERI B.M., MOLENDI S., GASTALDELLO F. and GHIZZARDI S.

Abstract (from CDS):

X-ray astronomers often divide galaxy clusters into two classes: ``cool core'' (CC) and ``non-cool core'' (NCC) objects. The origin of this dichotomy has been the subject of debate in recent years, between ``evolutionary'' models (where clusters can evolve from CC to NCC, mainly through mergers) and ``primordial'' models (where the state of the cluster is fixed ``ab initio'' by early mergers or pre-heating). We found that in a well-defined sample (clusters in the GMRT Radio halo survey with available Chandra or XMM-Newton data), none of the objects hosting a giant radio halo can be classified as a cool core. This result suggests that the main mechanisms that can start a large-scale synchrotron emission (most likely mergers) are the same as those that can destroy CC, which therefore strongly supports ``evolutionary'' models of the CC-NCC dichotomy. Moreover, combining the number of objects in the CC and NCC state with the number of objects with and without a radio-halo, we estimated that the time scale over which a NCC cluster relaxes to the CC state should be larger than the typical life-time of radio-halos and likely shorter than ≃3Gyr. This suggests that NCC transform into CC more rapidly than predicted from the cooling time, which is about 10Gyr in NCC systems, allowing the possibility of a cyclical evolution between the CC and NCC states.

Abstract Copyright:

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

Simbad objects: 25

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Number of rows : 25

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 2744 ClG 00 14 20.03 -30 23 17.8           ~ 571 0
2 ACO 209 ClG 01 31 57.5 -13 34 35           ~ 250 0
3 ACO 3088 ClG 03 07 02.12 -28 39 57.3           ~ 60 0
4 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 213 0
5 ACO 611 ClG 08 00 58.7 +36 02 49           ~ 222 0
6 ACO 697 ClG 08 42 57.6 +36 21 45           ~ 214 0
7 ZwCl 0857+2107 ClG 09 00 37.9 +20 54 58           ~ 75 0
8 ACO 773 ClG 09 17 51.3 +51 43 20           ~ 261 0
9 ZwCl 0949+5207 ClG 09 52 49.1 +51 53 05           ~ 112 0
10 ZwCl 1113+0144 ClG 11 15 54.0 +01 29 44           ~ 32 0
11 ACO 1300 ClG 11 32 00.7 -19 53 34           ~ 132 0
12 ACO 1423 ClG 11 57 47.34 +33 42 43.5           ~ 140 0
13 ACO 1758 ClG 13 32 32.1 +50 30 37           ~ 210 2
14 ZwCl 1455+2232 ClG 14 57 15.2 +22 20 30     18.62     ~ 262 0
15 ACO S 780 ClG 14 59 29.1 -18 10 45           ~ 63 0
16 ClG J1504-0248 ClG 15 04 07.4 -02 48 15           ~ 150 0
17 LEDA 1900245 Bla 15 32 53.780 +30 20 59.41   19.1   15.7   ~ 128 0
18 ACO 2163 ClG 16 15 34.1 -06 07 26           ~ 519 0
19 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 317 0
20 RXC J2003.5-2323 ClG 20 03 32.3 -23 23 30           ~ 53 0
21 ACO 2390 ClG 21 53 34.6 +17 40 11           ~ 625 2
22 1RXS J222834.4+203647 ClG 22 28 37.1 +20 36 31           ~ 102 0
23 ACO 2537 ClG 23 08 22.3 -02 11 29           ~ 106 0
24 ACO 2631 ClG 23 37 40.7 +00 16 35           ~ 138 0
25 ACO 2667 ClG 23 51 39.37 -26 05 02.7           ~ 150 0

    Equat.    Gal    SGal    Ecl

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2020.07.03-20:56:07

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