[LLV2000] 227 , the SIMBAD biblio

The cluster Abell 2104 is one of the lowest redshift clusters (z=0.153) known to have a gravitational lensing arc. 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∼3x10⁴⁵ergs/s and a high gas temperature of ∼10.4keV. The X-ray emission extending out to at least a radius of 1.46Mpc, 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)~(8.0±0.8)x10¹⁴M_☉. The gas fraction within a radius of 1.46Mpc is ∼5-10%. The cluster galaxy velocity distribution has a dispersion of 1200±200km/s with no obvious evidence for substructure. The total mass within 1.46Mpc, deduced from Jean's equation using the observed galaxy number density distribution and velocity dispersion, is found to be ∼6.8x10¹⁴M_☉ to ∼2.6x10¹⁵M_☉ marginally consistent with the X-ray deduced total mass.