2004ApJ...606..635M


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.27CEST09:28:20

2004ApJ...606..635M - Astrophys. J., 606, 635-653 (2004/May-2)

Formation of cool cores in galaxy clusters via hierarchical mergers.

MOTL P.M., BURNS J.O., LOKEN C., NORMAN M.L. and BRYAN G.

Abstract (from CDS):

We present a new scenario for the formation of cool cores in rich galaxy clusters, based on results from recent high spatial dynamic range, adaptive mesh Eulerian hydrodynamic simulations of large-scale structure formation. We find that cores of cool gas, material that would be identified as a classical cooling flow on the basis of its X-ray luminosity excess and temperature profile, are built from the accretion of discrete stable subclusters. Any ``cooling flow'' present is overwhelmed by the velocity field within the cluster; the bulk flow of gas through the cluster typically has speeds up to about 2000 km/s, and significant rotation is frequently present in the cluster core. The inclusion of consistent initial cosmological conditions for the cluster within its surrounding supercluster environment is crucial when the evolution of cool cores in rich galaxy clusters is simulated. This new model for the hierarchical assembly of cool gas naturally explains the high frequency of cool cores in rich galaxy clusters, despite the fact that a majority of these clusters show evidence of substructure that is believed to arise from recent merger activity. Furthermore, our simulations generate complex cluster cores in concordance with recent X-ray observations of cool fronts, cool ``bullets'', and filaments in a number of galaxy clusters. Our simulations were computed with a coupled N-body, Eulerian, adaptive mesh refinement, hydrodynamics cosmology code that properly treats the effects of shocks and radiative cooling by the gas. We employ up to seven levels of refinement to attain a peak resolution of 15.6 kpc within a volume 256 Mpc on a side and assume a standard ΛCDM cosmology.

Abstract Copyright:

Journal keyword(s): Galaxies: Cooling Flows - Cosmology: Theory - Galaxies: Clusters: General - Hydrodynamics - Methods: Numerical

Status at CDS:  

Simbad objects: 13

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Number of rows : 13

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           ~ 784 0
2 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 795 1
3 ACO 754 ClG 09 08 50.1 -09 38 12           ~ 630 1
4 ACO 851 ClG 09 42 56.6 +46 59 22           ~ 308 0
5 ACO 3526 ClG 12 48 51.8 -41 18 21           ~ 968 2
6 NGC 4874 LIN 12 59 35.709 +27 57 33.80 13.01 13.7 11.40 12.122 11.386 ~ 711 3
7 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4186 2
8 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1150 0
9 ACO 2142 ClG 15 58 20.00 +27 14 00.3           ~ 667 0
10 ACO 2163 ClG 16 15 34.1 -06 07 26           ~ 519 0
11 ACO 2256 ClG 17 03 43.5 +78 43 03           ~ 829 1
12 ClG J1720+2638 ClG 17 20 09.6 +26 37 35           ~ 204 0
13 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 563 1

    Equat.    Gal    SGal    Ecl

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2020.05.27-09:28:20

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