Probing the gravitational potential of a nearby lensing cluster Abell 2104

The cluster Abell 2104 is one of the lowest redshift clusters (z = 0.153) known to have a gravitational lensing are. We present detailed analysis of the cluster properties such as the gravitational potential using the X-ray data from ROSAT (HRI) and ASCA, as well as optical imaging and spectroscopic data from the CFHT. The cluster is highly luminous in the X-ray with a bolometric luminosity of L-x similar to 3 x 10(45) ergs s(-1) and a high gas temperature of similar to 10.4 keV. The X-ray emission extending out to at least a radius of 1.46 Mpc, displays significant substructure. The total mass deduced from the X-ray data under the assumption of hydrostatic equilibrium and isothermal gas, is found to be M-tot(r < 1.46Mpc) <similar to> (8.0 +/- 0.8) x 10(14) M.. The gas fraction within a radius of 1.46 Mpc is similar to 5 - 10%. The cluster galaxy velocity distribution has a dispersion of 1200 +/- 200 kms-l with no obvious evidence for substructure. The total mass within 1.46 Mpc, deduced from Jean's equation using the observed galaxy number density distribution and velocity dispersion, is found to be similar to 6.8 x 10(14) M. to similar to 2.6 x 10(15) M. marginally consistent with the X-ray deduced total mass.