2014A&A...572A..46B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST02:47:36

2014A&A...572A..46B - Astronomy and Astrophysics, volume 572A, 46-46 (2014/12-1)

Intracluster medium cooling, AGN feedback, and brightest cluster galaxy properties of galaxy groups. Five properties where groups differ from clusters.

BHARADWAJ V., REIPRICH T.H., SCHELLENBERGER G., ECKMILLER H.J., MITTAL R. and ISRAEL H.

Abstract (from CDS):

We aim to investigate cool-core and non-cool-core properties of galaxy groups through X-ray data and compare them to the AGN radio output to understand the network of intracluster medium (ICM) cooling and feedback by supermassive black holes. We also aim to investigate the brightest cluster galaxies (BCGs) to see how they are affected by cooling and heating processes, and compare the properties of groups to those of clusters. Using Chandra data for a sample of 26 galaxy groups, we constrained the central cooling times (CCTs) of the ICM and classified the groups as strong cool-core (SCC), weak cool-core (WCC), and non-cool-core (NCC) based on their CCTs. The total radio luminosity of the BCG was obtained using radio catalogue data and/or literature, which in turn was compared to the cooling time of the ICM to understand the link between gas cooling and radio output. We determined K-band luminosities of the BCG with 2MASS data, and used a scaling relation to constrain the masses of the supermassive black holes, which were then compared to the radio output. We also tested for correlations between the BCG luminosity and the overall X-ray luminosity and mass of the group. The results obtained for the group sample were also compared to previous results for clusters. The observed cool-core/non-cool-core fractions for groups are comparable to those of clusters. However, notable differences are seen: 1) for clusters, all SCCs have a central temperature drop, but for groups this is not the case as some have centrally rising temperature profiles despite very short cooling times; 2) while for the cluster sample, all SCC clusters have a central radio source as opposed to only 45% of the NCCs, for the group sample, all NCC groups have a central radio source as opposed to 77% of the SCC groups; 3) for clusters, there are indications of an anticorrelation trend between radio luminosity and CCT. However, for groups this trend is absent; 4) the indication of a trend of radio luminosity with black hole mass observed in SCC clusters is absent for groups; and 5) similarly, the strong correlation observed between the BCG luminosity and the cluster X-ray luminosity/cluster mass weakens significantly for groups. We conclude that there are important differences between clusters and groups within the ICM cooling/AGN feedback paradigm and speculate that more gas is fueling star formation in groups than in clusters where much of the gas is thought to feed the central AGN.

Abstract Copyright:

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

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 - 2020
#notes
1 NGC 326 rG 00 58 22.637 +26 51 58.61   14.9 13     ~ 162 2
2 IC 1633 BiC 01 09 55.599 -45 55 52.38   12.23       ~ 82 3
3 ACO 160 ClG 01 12 59.572 +15 29 28.65           ~ 164 0
4 NGC 507 BiC 01 23 39.950 +33 15 22.22   13.0       ~ 395 3
5 NGC 533 GiG 01 25 31.432 +01 45 33.57   13.1 14.11     ~ 207 0
6 NGC 777 Sy2 02 00 14.934 +31 25 45.78 13.09 12.49 11.45     ~ 156 2
7 NGC 1132 GiG 02 52 51.82 -01 16 29.0   13.9   12.16   ~ 146 0
8 NGC 1550 BiC 04 19 37.921 +02 24 35.58   14.0       ~ 150 1
9 IC 2082E BiC 04 29 08.198 -53 49 40.47   14.95   13.40   ~ 10 0
10 NAME ESO 552-20 Group ClG 04 54 52.318 -18 06 56.52           ~ 28 0
11 SDSSCGA 42 CGG 10 22 10.01 +38 31 23.6           ~ 6 0
12 ACO 1177 ClG 11 09 27 +21 41.7           ~ 93 1
13 NAME NGC 4073 Group GrG 12 04 21.7 +01 50 19     13.53     ~ 245 0
14 NGC 4325 BiC 12 23 06.662 +10 37 16.45   15.0       ~ 116 1
15 HCG 62 CGG 12 53 05.6 -09 12 21           ~ 293 0
16 NGC 4936 LIN 13 04 17.091 -30 31 34.71   11.76 12.23 10.13 10.9 ~ 95 0
17 NGC 5129 LIN 13 24 10.001 +13 58 35.19   13.3       ~ 111 1
18 IC 4296 AGN 13 36 39.03275288 -33 57 57.0783023   11.52 12.99 10.00   ~ 442 2
19 NGC 5419 BiC 14 03 38.771 -33 58 42.20   11.77 11.33 10.21   ~ 169 2
20 NAME NGC 5718 Group ClG 14 40 38.5 +03 28 20     14.31     ~ 104 0
21 NGC 5813 LIN 15 01 11.265 +01 42 07.09 12.00 11.45 10.46 10.06   ~ 579 1
22 NAME LHB X 16 42.0 +02 19           ~ 257 0
23 NGC 6269 GiG 16 57 58.099 +27 51 15.72   14.4 13.73     ~ 95 0
24 NGC 6338 Bla 17 15 23.0 +57 24 40   14.2   8   ~ 144 2
25 IC 1262 BiC 17 33 02.022 +43 45 34.51   14.9       ~ 65 0
26 NGC 6482 GiG 17 51 48.8334002678 +23 04 18.884647281 12.71 12.35 11.45     ~ 190 1
27 SDSS-C4-DR3 2030 GrG 22 14 48.0 +13 50 17           ~ 28 0
28 HCG 97 CGG 23 47 24.0 -02 19 08           ~ 93 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-02:47:36

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