2011A&A...532A.133M

Query : 2011A&A...532A.133M

2011A&A...532A.133M - Astronomy and Astrophysics, volume 532A, 133-133 (2011/8-1)

The LX-Tvir relation in galaxy clusters: effects of radiative cooling and AGN heating.

MITTAL R., HICKS A., REIPRICH T.H. and JARITZ V.

Abstract (from CDS):

We present a detailed investigation of the X-ray luminosity (Lx)-gas temperature(Tvir) relation of the complete X-ray flux-limited sample of the 64 brightest galaxy clusters in the sky (HIFLUGCS). We study the influence of two astrophysical processes, active galactic nuclei (AGN) heating and intracluster medium (ICM) cooling, on the Lx-Tvir relation, simultaneously for the first time. We employ homogeneously determined gas temperatures and central cooling times, measured with CHANDRA, and information about a central radio source from Mittal and collaborators. We determine best-fit relations for different subsamples using the cool-core strength and the presence of central radio activity as selection criteria. We find the strong cool-core clusters (SCCs) with short cooling times (<1Gyr) to display the steepest relation (Lx∝Tvir3.33±0.15) and the non-cool-core clusters (NCCs) with long cooling times (>7.7 Gyr) to disCHANDRAplay the shallowest (Lx∝_ Tvir2.42±0.21). This has the simple implication that on the high-mass scale (Tvir>2.5keV) the steepening of the Lx-Tvir relation is mainly due to the cooling of the intracluster medium gas. We propose that ICM cooling and AGN heating are both important in shaping the Lx-Tvir relation but on different length-scales. While our study indicates that ICM cooling dominates on cluster scales (Tvir>2.5keV), we speculate that AGN heating dominates the scaling relation in poor clusters and groups (Tvir<2.5keV). The intrinsic scatter about the Lx-Tvir relation in X-ray luminosity for the whole sample is 45.4% and varies from a minimum of 34.8% for weak cool-core clusters to a maximum of 59.4% for clusters with no central radio source. The scatter does not decrease if SCC clusters are excluded from the full sample. We find that the contribution of core luminosities within the cooling radius rcool, where the cooling time is 7.7Gyr and gas cooling may be important, to the total X-ray luminosities amounts to 44% and 15% for the SCC and WCC clusters, respectively. We find that after excising the cooling region, the scatter in the Lx-Tvir relation drops from 45.4% to 39.1%, implying that the cooling region contributes ∼27% to the overall scatter. The remaining scatter is largely due to the NCCs. Lastly, the statistical completeness of the sample allows us to quantify and correct for selection effects individually for the subsamples. We find the true SCC fraction to be 25% lower than the observed one and the true normalizations of the Lx-Tvir relations to be lower by 12%, 7%, and 17% for SCC, WCC, and NCC clusters, respectively.

Abstract Copyright: ∼

Journal keyword(s): cooling flows - X-rays: galaxies: clusters - radio continuum: galaxies

Simbad objects: 65

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Number of rows : 65
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 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 909 0
2 ACO 119 ClG 00 56 08.57 -01 12 00.8           ~ 555 2
3 ACO 133 ClG 01 02 41.5 -21 52 53           ~ 368 1
4 ZwCl 0120+3300 ClG 01 23 36.9 +33 15 03           ~ 78 0
5 NGC 507 BiC 01 23 39.950 +33 15 22.22   13.0       ~ 440 3
6 ACO 262 ClG 01 52 50.4 +36 08 46           ~ 699 1
7 ACO 400 ClG 02 57 37.4 +06 00 45           ~ 399 3
8 ACO 399 ClG 02 57 56.4 +13 00 59           ~ 396 0
9 ACO 401 ClG 02 58 56.9 +13 34 56           ~ 566 0
10 ACO 3112 ClG 03 17 52.4 -44 14 35           ~ 311 1
11 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1570 1
12 ZwCl 0335+0956 ClG 03 38 35.3 +09 57 54           ~ 383 1
13 2MASX J03411752+1523477 BiC 03 41 17.5329189192 +15 23 47.567775336   17.5       ~ 44 1
14 ACO 3158 ClG 03 42 39.6 -53 37 50           ~ 304 0
15 ACO 478 ClG 04 13 20.7 +10 28 35           ~ 502 0
16 NGC 1550 BiC 04 19 37.9450450152 +02 24 35.918168940   14.0       ~ 176 1
17 ClG 0422-09 ClG 04 25 51.02 -08 33 38.5           ~ 91 0
18 ACO 3266 ClG 04 31 11.9 -61 24 23           ~ 410 0
19 ACO 496 ClG 04 33 38.8 -13 15 59           ~ 694 2
20 ACO 3376 ClG 06 01 25.000 -39 59 51.00           ~ 305 0
21 ACO 3391 ClG 06 26 15.4 -53 40 52           ~ 202 1
22 ACO 3395 ClG 06 27 31.1 -54 23 58           ~ 209 0
23 ACO 576 ClG 07 21 24.1 +55 44 20           ~ 297 1
24 ACO 754 ClG 09 09 08.4 -09 39 58           ~ 666 1
25 ACO 780 ClG 09 18 30 -12 15.7           ~ 453 0
26 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 840 1
27 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1076 1
28 NAME NGC 4073 Group GrG 12 04 44.08 +01 48 40.9     13.53     ~ 280 0
29 ZwCl 1215+0400 ClG 12 17 43.62 +03 38 51.5           ~ 153 0
30 NGC 4636 LIN 12 42 49.8333280080 +02 41 15.951929028   12.62 11.84     ~ 1117 1
31 ACO 3526 ClG 12 48 51.8 -41 18 21           ~ 1068 2
32 ACO 1644 ClG 12 57 11.6 -17 24 34           ~ 366 1
33 ACO 1650 ClG 12 58 42.0 -01 45 45           ~ 304 0
34 ACO 1651 ClG 12 59 22.43 -04 11 47.1           ~ 290 0
35 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 4803 2
36 NGC 5044 BiC 13 15 23.9607836592 -16 23 07.547751744   11.9   10.74   ~ 501 0
37 ACO 1736 ClG 13 26 52.1 -27 06 33           ~ 249 2
38 ACO 3558 ClG 13 27 54.8 -31 29 32           ~ 442 2
39 ACO 3562 ClG 13 33 31.8 -31 40 23           ~ 314 1
40 ACO 3571 ClG 13 47 28.9 -32 51 57           ~ 284 2
41 ACO 1795 ClG 13 48 50.48 +26 35 07.4           ~ 1267 0
42 ACO 3581 ClG 14 07 29.8 -27 01 04           ~ 184 3
43 BAX 220.1796+03.4530 ClG 14 40 34.37 +03 29 49.7     14.31     ~ 119 0
44 Mrk 841 Sy1 15 04 01.1935384104 +10 26 15.780409692   14.50 14.27     ~ 649 0
45 ACO 2029 ClG 15 10 56.2 +05 44 42           ~ 943 0
46 ACO 2052 ClG 15 16 41.64 +07 01 45.5           ~ 730 1
47 ACT-CL J1521.8+0742 ClG 15 21 55.14 +07 41 27.2     15.13     ~ 311 0
48 ACO 2065 ClG 15 22 29.3 +27 42 22           ~ 374 0
49 ACO 2063 ClG 15 23 01.8 +08 38 22           ~ 397 2
50 ACO 2142 ClG 15 58 14.38 +27 12 57.8           ~ 768 0
51 ACO 2147 ClG 16 02 11.96 +15 55 11.5           ~ 403 0
52 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 563 0
53 ACO 2199 ClG 16 28 43.31 +39 34 07.6           ~ 1171 1
54 ACO 2204 ClG 16 32 45.7 +05 34 43           ~ 436 0
55 ACO 2244 ClG 17 02 40.33 +34 02 58.7           ~ 281 0
56 ACO 2256 ClG 17 03 09.4 +78 39 36           ~ 885 1
57 ACO 2255 ClG 17 12 50.04 +64 03 10.6           ~ 568 0
58 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 627 1
59 ACO S 1101 ClG 23 13 58.5 -42 43 39           ~ 258 1
60 ACO 2589 ClG 23 24 00.5 +16 49 29           ~ 316 1
61 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 539 0
62 ACO 2634 ClG 23 38 18.4 +27 01 37           ~ 503 2
63 ACO 2657 ClG 23 44 51.0 +09 08 40           ~ 269 3
64 ACO 4038 ClG 23 47 31.1 -28 12 10           ~ 335 3
65 ACO 4059 ClG 23 57 02.2 -34 45 58           ~ 380 1

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