2016A&A...585A.125B


Query : 2016A&A...585A.125B

2016A&A...585A.125B - Astronomy and Astrophysics, volume 585A, 125-125 (2016/1-1)

Investigating the cores of fossil systems with Chandra.

BHARADWAJ V., REIPRICH T.H., SANDERS J.S. and SCHELLENBERGER G.

Abstract (from CDS):

We aim to systematically investigate the cores of a sample of fossil galaxy groups and clusters (``fossil systems''), using Chandra data, to see what hints they can offer about the properties of the intracluster medium in these particular objects.We chose a sample of 17 fossil systems from literature with archival Chandra data and determined the cool-core fraction for fossils via three observable diagnostics, namely the central cooling time, cuspiness, and concentration parameter. We quantified the dynamical state of the fossils by the X-ray peak/brightest cluster galaxy (BCG) separation, and the X-ray peak/emission weighted centre separation. We also investigated the X-ray emission coincident with the brightest cluster galaxy (BCG) to detect the presence of potential thermal coronae. A deprojection analysis was performed for fossils with z<0.05 to resolve subtle temperature structures, and to obtain the cooling time and entropy profiles. We also investigated the LX-T relation for fossils from the 400d catalogue to test whether the scaling relation deviates from what is typically observed for other groups.Most fossils are identified as cool-core objects via at least two cool-core diagnostics with the population of weak cool-core fossils being the highest. All fossils have their dominant elliptical galaxy within 50kpc of the X-ray peak, and most also have the emission weighted centre within that distance. We do not see clear indications of an X-ray corona associated with the BCG unlike coronae observed for some other clusters. Fossils lack universal temperature profiles, with some low-temperature objects generally not showing features that are expected for ostensibly relaxed objects with a cool-core. The entropy profiles of the z<0.05 fossil systems can be described well by a power law with shallower indices than what is expected for pure gravitational processes. Finally, the fossils LX-T relation shows indications of an elevated normalisation with respect to other groups, which seems to persist even after factoring in selection effects.We interpret these results within the context of the formation and evolution of fossils, and speculate that non-gravitational heating, and AGN feedback in particular, could have had an impact on the ICM properties of these systems.

Abstract Copyright:

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

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 UGC 842 BLL 01 18 53.6237165304 -01 00 07.248153600   15.0       ~ 64 1
2 NAME OOP2020 J29.9554505-8.8329993 BiC 01 59 49.333 -08 49 58.92           ~ 12 0
3 [BVH2007] 29 ClG 02 45 45.7 +09 36 36           ~ 8 0
4 NGC 1132 GiG 02 52 51.82 -01 16 29.0   13.9   12.16   ~ 156 0
5 ESO 552-20 BiC 04 54 52.262 -18 06 56.12   13.34   11.64   ~ 61 1
6 ESO 306-17 BiC 05 40 06.6705952632 -40 50 11.448265704   13.35   11.82   ~ 51 1
7 NAME OOP2020 J120.2367241+36.0565643 BiC 08 00 56.849 +36 03 23.47         16.6 ~ 22 0
8 2MASX J08255782+0414480 BiC 08 25 57.8297935464 +04 14 48.255695844           ~ 8 0
9 ACO 1056 ClG 10 38 01.8 +41 46 38           ~ 19 0
10 NAME OOP2020 J168.9662572+1.4986333 BiC 11 15 51.902 +01 29 55.07           ~ 13 0
11 ClG J1159+5531 ClG 11 59 51.1 +55 31 56     15.64     ~ 90 1
12 2XMM J125602.2+255636 GrG 12 56 04.9 +25 56 52           ~ 29 0
13 WARPS J1331.5+1108 GrG 13 31 30.2 +11 08 04           ~ 17 0
14 NAME RX J1340.6+4018 Group ClG 13 40 33.5 +40 17 46           ~ 30 1
15 2E 3223 GrG 14 16 32.00 +23 19 06.8           ~ 49 0
16 NGC 6482 GiG 17 51 48.8339247888 +23 04 18.889271112 12.71 12.35 11.45     ~ 198 1
17 [VBH2010] cl2220m5228 GrG 22 19 49.0 -52 27 13           ~ 2 0
18 BAX 341.8712+03.6203 ClG 22 47 29.5 +03 37 08           ~ 25 1

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2022.05.26-00:37:24

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