SIMBAD references

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.


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

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