2002ApJ...565L...5B


C.D.S. - SIMBAD4 rel 1.7 - 2020.06.02CEST09:57:14

2002ApJ...565L...5B - Astrophys. J., 565, L5-L8 (2002/January-3)

Antibias in clusters: the dependence of the Mass-to-Light ratio on cluster temperature.

BAHCALL N.A. and COMERFORD J.M.

Abstract (from CDS):

We show that the observed mass-to-light (M/L) ratio of galaxy clusters increases with cluster temperature as expected from cosmological simulations. Contrary to previous observational suggestions, we find a mild but robust increase of M/L from poor (T∼1-2 keV) to rich (T∼12 keV) clusters; over this range, the mean M/LV increases by a factor of about 2. The best-fit relation satisfies M/LV=(170±30)T0.3±0.1keV h at z=0, with a large scatter. This trend confirms predictions from cosmological simulations that show that the richest clusters are antibiased, with a higher ratio of mass per unit light than average. The antibias increases with cluster temperature. The effect is caused by the relatively older age of the high-density clusters, where light has declined more significantly than average since their earlier formation time. Combining the current observations with simulations, we find a global value of M/LV=240±50 h and a corresponding mass density of the universe of Ωm=0.17±0.05.

Abstract Copyright:

Journal keyword(s): Cosmology: Observations - Cosmology: Theory - Cosmology: Dark Matter - Galaxies: Clusters: General - Cosmology: Large-Scale Structure of Universe

Status at CDS:  

Simbad objects: 20

goto Full paper

goto View the reference in ADS

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 - 2020
#notes
1 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 472 0
2 ACO 262 ClG 01 52 50.4 +36 08 46           ~ 650 1
3 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 1931 1
4 ACO 478 ClG 04 13 20.7 +10 28 35           ~ 466 0
5 ClG 0440+02 ClG 04 43 09.7 +02 10 19     17.03     ~ 118 0
6 ClG 0451-03 ClG 04 54 10.9 -03 01 07     20.0     ~ 328 0
7 ZwCl 0839+2937 ClG 08 42 55.9 +29 27 52     17.0     ~ 80 0
8 ClG 1008-12 ClG 10 10 34.1 -12 39 48     18.0     ~ 144 0
9 ClG 1054-03 ClG 10 57 00.2 -03 37 27     22     ~ 449 0
10 NAME NGC 4104 Group GrG 12 06 48 +28 09.9           ~ 38 0
11 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1017 0
12 ClG J1347-1145 ClG 13 47 33.5 -11 45 42           ~ 463 0
13 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1150 0
14 ZwCl 1358+6245 ClG 13 59 54.3 +62 30 36     18.5     ~ 348 0
15 ACO 2052 ClG 15 16 45.5 +07 00 01           ~ 672 1
16 ACO 2063 ClG 15 23 01.8 +08 38 22           ~ 369 2
17 ACO 2163 ClG 16 15 34.1 -06 07 26           ~ 519 0
18 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1097 1
19 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 779 1
20 ACO 2390 ClG 21 53 34.6 +17 40 11           ~ 624 2

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2002ApJ...565L...5B and select 'bookmark this link' or equivalent in the popup menu


2020.06.02-09:57:14

© Université de Strasbourg/CNRS

    • Contact