2010A&A...513A..37H


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST22:51:53

2010A&A...513A..37H - Astronomy and Astrophysics, volume 513, A37-37 (2010/4-1)

What is a cool-core cluster? a detailed analysis of the cores of the X-ray flux-limited HIFLUGCS cluster sample.

HUDSON D.S., MITTAL R., REIPRICH T.H., NULSEN P.E.J., ANDERNACH H. and SARAZIN C.L.

Abstract (from CDS):

We use the largest complete sample of 64 galaxy clusters (HIghest X-ray FLUx Galaxy Cluster Sample) with available high-quality X-ray data from Chandra, and apply 16 cool-core diagnostics to them, some of them new. In order to identify the best parameter for characterizing cool-core clusters and quantify its relation to other parameters, we mainly use very high spatial resolution profiles of central gas density and temperature, and quantities derived from them. We also correlate optical properties of brightest cluster galaxies (BCGs) with X-ray properties. To segregate cool core and non-cool-core clusters, we find that central cooling time, tcool, is the best parameter for low redshift clusters with high quality data, and that cuspiness is the best parameter for high redshift clusters. 72% of clusters in our sample have a cool core (tcool<7.7h71–1/2Gyr) and 44% have strong cool cores (tcool<1.0h71–1/2Gyr). We find strong cool-core clusters are characterized as having low central entropy and a systematic central temperature drop. Weak cool-core clusters have enhanced central entropies and temperature profiles that are flat or decrease slightly towards the center. Non-cool-core clusters have high central entropies. For the first time we show quantitatively that the discrepancy in classical and spectroscopic mass deposition rates can not be explained with a recent formation of the cool cores, demonstrating the need for a heating mechanism to explain the cooling flow problem. We find that strong cool-core clusters have a distribution of central temperature drops, centered on 0.4Tvir. However, the radius at which the temperature begins to drop varies. This lack of a universal inner temperature profile probably reflects the complex physics in cluster cores not directly related to the cluster as a whole. Our results suggest that the central temperature does not correlate with the mass of the BCGs and weakly correlates with the expected radiative cooling only for strong cool-core clusters. Since 88% of the clusters in our sample have a BCG within a projected distance of 50h71–1kpc from the X-ray peak, we argue that it is easier to heat the gas (e.g. with mergers or non-gravitational processes) than to separate the dense core from the brightest cluster galaxy. Diffuse, Mpc-scale radio emission, believed to be associated with major mergers, has not been unambiguously detected in any of the strong cool-core clusters in our sample. Of the weak cool-core clusters and non-cool-core clusters, most of the clusters (seven out of eight) that have diffuse, Mpc-scale radio emission have a large (>50h71–1kpc) projected separation between their BCG and X-ray peak. In contrast, only two of the 56 clusters with a small separation between the BCG and X-ray peak (<50h71–1kpc) show large-scale radio emission. Based on this result, we argue that a large projected separation between the BCG and the X-ray peak is a good indicator of a major merger. The properties of weak cool-core clusters as an intermediate class of objects are discussed. Finally we describe individual properties of all 64 clusters in the sample.

Abstract Copyright:

Journal keyword(s): intergalactic medium - galaxies: clusters: general

Simbad objects: 80

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Number of rows : 80

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 85 ClG 00 41 37.8 -09 20 33           ~ 789 0
2 ACO 119 ClG 00 56 16.8 -01 15 00           ~ 517 2
3 ACO 133 ClG 01 02 39.0 -21 57 15           ~ 336 1
4 NGC 507 BiC 01 23 39.950 +33 15 22.22   13.0       ~ 395 3
5 ZwCl 0120+3300 ClG 01 23 41.0 +33 15 40           ~ 73 0
6 ACO 262 ClG 01 52 50.4 +36 08 46           ~ 652 1
7 ACO 400 ClG 02 57 37.4 +06 00 45           ~ 385 3
8 3C 75 PaG 02 57 41.64 +06 01 28.0           ~ 284 1
9 ACO 399 ClG 02 57 56.4 +13 00 59           ~ 346 0
10 ACO 401 ClG 02 58 56.9 +13 34 56           ~ 519 0
11 ACO 3112 ClG 03 17 52.4 -44 14 35           ~ 290 1
12 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1449 1
13 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1538 0
14 ZwCl 0335+0956 ClG 03 38 35.3 +09 57 54           ~ 343 1
15 NGC 1404 GiP 03 38 51.917 -35 35 39.81 11.53 10.69 10.00 9.03   ~ 671 1
16 2MASX J03411752+1523477 BiC 03 41 17.5325964402 +15 23 47.585740854   17.5       ~ 41 1
17 ACO 3158 ClG 03 42 39.6 -53 37 50           ~ 271 0
18 ACO 478 ClG 04 13 20.7 +10 28 35           ~ 467 0
19 NGC 1550 BiC 04 19 37.921 +02 24 35.58   14.0       ~ 150 1
20 NAME NGC 1550 Group ClG 04 19 38.0 +02 24 36           ~ 38 0
21 ClG 0422-09 ClG 04 25 51.02 -08 33 38.5           ~ 84 0
22 MCG-01-12-005 Sy2 04 25 51.336 -08 33 38.98   15.5   16.9   ~ 38 2
23 ACO 3266 ClG 04 31 11.9 -61 24 23           ~ 371 0
24 ACO 496 ClG 04 33 30.3838 -13 14 21.584           ~ 660 2
25 ACO 3376 ClG 06 01 42.1521 -39 59 06.227           ~ 270 0
26 ACO 3391 ClG 06 26 15.4 -53 40 52           ~ 170 1
27 ACO 3395 ClG 06 27 31.1 -54 23 58           ~ 179 0
28 ACO 576 ClG 07 21 24.1 +55 44 20           ~ 284 1
29 ACO 754 ClG 09 08 50.1 -09 38 12           ~ 631 1
30 ACO 780 ClG 09 18 30 -12 15.7           ~ 428 0
31 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 774 1
32 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 994 1
33 NAME NGC 4073 Group GrG 12 04 21.7 +01 50 19     13.53     ~ 245 0
34 ZwCl 1215+0400 ClG 12 17 40.6 +03 39 45           ~ 105 0
35 NAME NGC 4636 Group GrG 12 42 49.5 +02 41 08           ~ 549 0
36 NGC 4636 LIN 12 42 49.867 +02 41 16.01   12.62 11.84     ~ 1041 1
37 ACO 3526 ClG 12 48 51.8 -41 18 21           ~ 971 2
38 ACO 1644 ClG 12 57 11.6 -17 24 34           ~ 332 1
39 ACO 1650 ClG 12 58 36.76 -01 43 34.2           ~ 270 0
40 ACO 1651 ClG 12 59 22.43 -04 11 47.1           ~ 274 0
41 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4208 2
42 NAME SHAPLEY-CENTAURUS CL SCG 13 06.0 -33 04           ~ 500 0
43 NAME HYA-CEN SUPERCL SCG 13 14 -33.3           ~ 129 0
44 NGC 5044 BiC 13 15 23.969 -16 23 08.00   11.9   10.74   ~ 452 0
45 ACO 1736 ClG 13 26 52.1 -27 06 33           ~ 237 2
46 ACO 3558 ClG 13 27 54.8 -31 29 32           ~ 406 2
47 [BZM96] 8 ClG 13 29 47 -31 36.5           ~ 57 1
48 ACO 3562 ClG 13 33 31.8 -31 40 23           ~ 283 1
49 ACO 3571 ClG 13 47 28.9 -32 51 57           ~ 264 2
50 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1154 0
51 IC 4374 QSO 14 07 29.76224452 -27 01 04.2931696   13.61   11.79   ~ 120 3
52 ACO 3581 ClG 14 07 29.8 -27 01 04           ~ 165 3
53 NAME NGC 5718 Group ClG 14 40 38.5 +03 28 20     14.31     ~ 104 0
54 ClG J1504-0248 ClG 15 04 07.4 -02 48 15           ~ 150 0
55 2MASX J15040752-0248161 Sy1 15 04 07.519415 -02 48 16.65402   18.53 18.08     ~ 44 1
56 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 852 0
57 ACO 2052 ClG 15 16 45.5 +07 00 01           ~ 675 1
58 NAME NGC 5920 Group ClG 15 21 50.7 +07 42 18     15.13     ~ 287 0
59 ACO 2065 ClG 15 22 42.6 +27 43 21           ~ 343 0
60 ACO 2063 ClG 15 23 01.8 +08 38 22           ~ 370 2
61 NAME Corona Borealis SCG 15 25 +29.5           ~ 116 0
62 NAME HERCULES SUPERCL SCG 15 47 +18.2           ~ 137 1
63 ACO 2142 ClG 15 58 20.00 +27 14 00.3           ~ 672 0
64 ACO 2147 ClG 16 02 17.2 +15 53 43           ~ 375 0
65 ACO 2152 ClG 16 05 22.4 +16 26 55           ~ 153 0
66 ACO 2163 ClG 16 15 34.1 -06 07 26           ~ 519 0
67 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1101 1
68 ACO 2204 ClG 16 32 45.7 +05 34 43           ~ 398 0
69 ACO 2244 ClG 17 02 34.01 +34 04 41.1           ~ 246 0
70 ACO 2256 ClG 17 03 43.5 +78 43 03           ~ 830 1
71 ACO 2255 ClG 17 12 50.04 +64 03 10.6           ~ 502 0
72 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 566 1
73 ACO S 1101 ClG 23 13 58.5 -42 43 39           ~ 233 1
74 ACO 2589 ClG 23 24 00.5 +16 49 29           ~ 297 1
75 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 493 0
76 ACO 2634 ClG 23 38 18.4 +27 01 37           ~ 480 2
77 NGC 7720 Sy1 23 38 29.38322439 +27 01 53.2583763   13.9 13.3     ~ 512 4
78 ACO 2657 ClG 23 44 51.0 +09 08 40           ~ 260 3
79 ACO 4038 ClG 23 47 31.1 -28 12 10           ~ 313 3
80 ACO 4059 ClG 23 56 40.7 -34 40 18           ~ 352 1

    Equat.    Gal    SGal    Ecl

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2020.07.14-22:51:53

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