Volume 452, Number 1, June II 2006
|Page(s)||75 - 81|
|Section||Cosmology (including clusters of galaxies)|
|Published online||17 May 2006|
The radial profiles of the different mass components in galaxy clusters
INAF/Osservatorio Astronomico di Trieste, via G. B. Tiepolo 11, 34131 Trieste, Italy e-mail: email@example.com
2 International School for Advanced Studies SISSA/ISAS, via Beirut 2–4, 34013 Trieste, Italy e-mail: firstname.lastname@example.org
Accepted: 19 February 2006
Aims.To derive the mass profiles of the different luminous and dark components in clusters.
Methods.The cluster mass profile is determined by using the Jeans equation applied to the projected phase-space distribution of about 3000 galaxies members of 59 nearby clusters from the ESO Nearby Abell Cluster Survey. The baryonic and subhaloes mass components are determined from the galaxies' luminosity-density profiles through scaling relations between luminosities and baryonic and dark halo masses. The baryonic mass component associated with the intra-cluster gas is determined using X-ray data from ROSAT.
Results.The baryon-to-total mass fraction decreases from a value of 0.12 near the center to 0.08 at the distance of 0.15 virial radii, then it increases again, to reach a value of 0.14 at the virial radius. Diffuse, cluster-scale dark matter dominates at all radii, but its contribution to the total mass content decreases outwards to the virial radius, where the dark matter in subhaloes may contribute up to 23%, and the baryons 14% of the total mass. The dark mass and diffuse dark mass profiles are well fit by both cuspy and cored models. The subhalo mass distribution is not fit by either model.
Key words: cosmology: observations / galaxies: clusters: general / galaxies: kinematics and dynamics / cosmology: dark matter
© ESO, 2006
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.