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Velocity dispersion, mass and the luminosity function of the fossil cluster RX j1416.4+2315

Grant number: 07/00180-8
Support type:Regular Research Grants - Publications - Scientific article
Duration: February 01, 2007 - April 30, 2007
Field of knowledge:Physical Sciences and Mathematics - Astronomy
Principal Investigator:Laerte Sodré Junior
Grantee:Laerte Sodré Junior
Home Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

We study the properties of the fossil cluster RX J1416.4+2315 through g'- and i'-band imaging and spectroscopy of 25 member galaxies. The system is at a mean redshift of 0.137 and has a velocity dispersion of 584 km/s. Superposed onto one quadrant of the cluster field is a group of five galaxies at a mean redshift of 0.131, which, if included as part of the cluster, increases the velocity dispersion to 846 km/s. The central object of RX J1416.4+2315 is a normal elliptical galaxy with no cD envelope. The luminosity function of the system, estimated by the number counts and statistical background correction in the range -22.6