2011A&A...535A..78Z


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.14CEST14:08:46

2011A&A...535A..78Z - Astronomy and Astrophysics, volume 535A, 78-78 (2011/11-1)

Star-formation efficiency and metal enrichment of the intracluster medium in local massive clusters of galaxies.

ZHANG Y.-Y., LAGANA T.F., PIERINI D., PUCHWEIN E., SCHNEIDER P. and REIPRICH T.H.

Abstract (from CDS):

We have investigated the baryon-mass content in a subsample of 19 clusters of galaxies extracted from the X-ray flux-limited sample HIFLUGCS according to their positions in the sky. For these clusters, we measured total masses and characteristic radii on the basis of a rich optical spectroscopic data set, the physical properties of the intracluster medium (ICM) using XMM-Newton and ROSAT X-ray data, and total (galaxy) stellar masses utilizing the SDSS DR7 multi-band imaging. The observed (hot) gas-mass fractions are almost constant in this mass range. We confirm that the stellar mass fraction decreases as the total mass increases and shows (20±4)% scatter; in addition, we show that it decreases as the central entropy increases. The latter behavior supports a twofold interpretation, where heating from merging quenches the star-formation activity of galaxies in massive systems, and feedback from supernovae and/or radio galaxies drives a significant amount of gas to the regions beyond r500 or, alternatively, a substantially large amount of intracluster light (ICL) is associated with galaxies in nonrelaxed systems. Furthermore, less massive clusters are confirmed to host less gas per unit total mass; however, they exhibit higher mass fractions in metals, so that their ICM is more metal-rich. This again supports the interpretation that in the potential wells of low-mass systems the star-formation efficiency of galaxies was high or, alternatively, some gas is missing from the hot phase of the ICM. The former hypothesis is preferred as the main driver of the mass-dependent metal enrichment since the total mass-to-optical luminosity ratio increases as the total mass increases.

Abstract Copyright:

Journal keyword(s): X-rays: galaxies: clusters - cosmology: observations - methods: data analysis - galaxies: clusters: general - surveys - galaxies: stellar content

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 - 2019
#notes
1 ACO 85 ClG 00 41 37.8 -09 20 33           ~ 766 0
2 ACO 400 ClG 02 57 37.4 +06 00 45           ~ 380 3
3 2MASX J03411752+1523477 BiC 03 41 17.5325964402 +15 23 47.585740854   17.5       ~ 39 1
4 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 1876 0
5 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 975 1
6 NAME NGC 4073 Group GrG 12 04 21.7 +01 50 19     13.53     ~ 239 0
7 ZwCl 1215+0400 ClG 12 17 40.6 +03 39 45           ~ 99 0
8 ACO 1650 ClG 12 58 36.76 -01 43 34.2           ~ 264 0
9 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4092 2
10 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1133 0
11 NAME NGC 5718 Group ClG 14 40 38.5 +03 28 20     14.31     ~ 101 0
12 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 835 0
13 ACO 2052 ClG 15 16 45.5 +07 00 01           ~ 664 1
14 NAME NGC 5920 Group ClG 15 21 50.7 +07 42 18     15.13     ~ 281 0
15 ACO 2065 ClG 15 22 42.6 +27 43 21           ~ 336 0
16 ACO 2142 ClG 15 58 20.00 +27 14 00.3           ~ 657 0
17 ACO 2147 ClG 16 02 17.2 +15 53 43           ~ 366 0
18 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1084 1
19 ACO 2255 ClG 17 12 50.04 +64 03 10.6           ~ 492 0
20 ACO 2589 ClG 23 24 00.5 +16 49 29           ~ 291 1

    Equat.    Gal    SGal    Ecl

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2019.10.14-14:08:46

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