2008A&A...485..633L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.16CEST15:56:26

2008A&A...485..633L - Astronomy and Astrophysics, volume 485, 633-644 (2008/7-3)

Star formation efficiency in galaxy clusters.

LAGANA T.F., LIMA NETO G.B., ANDRADE-SANTOS F. and CYPRIANO E.S.

Abstract (from CDS):

The luminous material in clusters of galaxies exists in two forms: the visible galaxies and the X-ray emitting intra-cluster medium. The hot intra-cluster gas is the major observed baryonic component of clusters, about six times more massive than the stellar component. The mass contained within visible galaxies is approximately 3% of the dynamical mass. Our aim was to analyze both baryonic components, combining X-ray and optical data of a sample of five galaxy clusters (Abell 496, 1689, 2050, 2631 and 2667), within the redshift range 0.03<z<0.3. We determined the contribution of stars in galaxies and the intra-cluster medium to the total baryon budget. We used public XMM-Newton data to determine the gas mass and to obtain the X-ray substructures. Using the optical counterparts from SDSS or CFHT we determined the stellar contribution. We examine the relative contribution of galaxies, intra-cluster light and intra-cluster medium to baryon budget in clusters through the stellar-to-gas mass ratio, estimated with recent data. We find that the stellar-to-gas mass ratio within r500 (the radius within which the mean cluster density exceeds the critical density by a factor of 500), is anti-correlated with the ICM temperature, which range from 24% to 6% while the temperature ranges from 4.0 to 8.3keV. This indicates that less massive cold clusters are more prolific star forming environments than massive hot clusters.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - X-rays: galaxies: clusters - galaxies: luminosity function, mass function

CDS comments: Figure 3 ACO 469 is a misprint for ACO 496.

Simbad objects: 7

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Number of rows : 7

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           ~ 789 0
2 ACO 496 ClG 04 33 30.3838 -13 14 21.584           ~ 661 2
3 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 774 1
4 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1022 0
5 ACO 2050 ClG 15 16 21.6 +00 05 59           ~ 88 0
6 ACO 2631 ClG 23 37 40.7 +00 16 35           ~ 138 0
7 ACO 2667 ClG 23 51 39.37 -26 05 02.7           ~ 150 0

    Equat.    Gal    SGal    Ecl

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2020.07.16-15:56:26

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