2011ApJ...742...19C


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.21CET06:29:46

2011ApJ...742...19C - Astrophys. J., 742, 19 (2011/November-3)

A grand design for galaxy clusters: connections and predictions.

CAVALIERE A., LAPI A. and FUSCO-FEMIANO R.

Abstract (from CDS):

We analyze with our entropy-based Supermodel a library of 12 galaxy clusters featuring extended X-ray observations of their intracluster plasma (ICP). The few intrinsic parameters of the model–basically, the central level and the outer slope of the entropy profile–enable us to uniformly derive not only robust snapshots of the ICP thermal state, but also the "concentration" parameter marking the age of the host dark matter (DM) halo. We test these profiles for consistency with numerical simulations and observations. We find the central and the outer entropy correlate, so that these clusters split into two main classes defined on the basis of low (LE) or high entropy (HE) conditions prevailing throughout the ICP. We also find inverse correlations between the central/outer entropy and the halo concentration. We interpret these in terms of mapping the ICP progress on timescales around 5 Gyr toward higher concentrations, under the drive of the DM halo development. The progress proceeds from HE clusters to LE clusters, toward states of deeper entropy erosion by radiative cooling in the inner regions and of decreasing outer entropy production as the accretion peters out. We propose these radial and time features constitute a cluster Grand Design that we use here to derive a number of predictions. For HE clusters we predict sustained outer temperature profiles. For LEs we expect the outer entropy ramp to bend over; hence the temperature declines before steepening at low z; this feature goes together with an increasing turbulent support, a condition that can be directly probed with the Sunyaev-Zel'dovich effect. We finally discuss the looming out of two intermediate subsets: a wiggled HE∼ at low z that features central temperature profiles retaining imprints of entropy discharged by active galactic nuclei or deep mergers and high-z LEs where the cosmogony/cosmology had little time to enforce a sharp outer entropy bending.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual (A399, A1656, A2218, A2256) - methods: analytical - X-rays: galaxies: clusters

Simbad objects: 20

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Number of rows : 20

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 MCS J0025.4-1222 ClG 00 25 29.381 -12 22 37.06           ~ 120 0
2 ACO 399 ClG 02 57 56.4 +13 00 59           ~ 351 0
3 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 1989 1
4 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 822 1
5 2MASX J07473129-1917403 BiC 07 47 31.296 -19 17 40.34   19.60       ~ 394 1
6 ClG 0745-19 ClG 07 47 31.3 -19 17 40           ~ 365 0
7 ACO 644 ClG 08 17 24.5 -07 30 46           ~ 204 0
8 ACO 754 ClG 09 08 50.1 -09 38 12           ~ 636 1
9 ACO 1413 ClG 11 55 18.0 +23 24 19           ~ 384 0
10 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5952 0
11 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4299 2
12 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1034 0
13 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1174 0
14 ACO 2146 ClG 15 56 04.7 +66 20 24           ~ 145 0
15 ACO 2142 ClG 15 58 20.00 +27 14 00.3           ~ 682 0
16 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1112 1
17 ACO 2204 ClG 16 32 45.7 +05 34 43           ~ 403 0
18 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 782 1
19 ACO 2256 ClG 17 03 43.5 +78 43 03           ~ 836 1
20 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 501 0

    Equat.    Gal    SGal    Ecl

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2021.01.21-06:29:46

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