X-ray spectral and imaging data from ASCA and ROSAT were used to measure the total mass profile in the central region of Abell 1060 , a nearby and relatively poor cluster of galaxies .
The ASCA X-ray spectra , after correcting for the spatial response of the X-ray telescope , show an isothermal distribution of the intra-cluster medium ( ICM ) within at least \sim 12 ^ { \prime } ( or 160 h _ { 70 } ^ { -1 } kpc ; H _ { 0 } = 70 h _ { 70 } km s ^ { -1 } Mpc ^ { -1 } ) in radius of the cluster center .
The azimuthally averaged surface brightness profile from the ROSAT PSPC exhibits a central excess above an isothermal \beta model .
The ring-sorted ASCA GIS spectra and the radial surface brightness distribution from the ROSAT PSPC were simultaneously utilized to constrain the gravitational potential profile .
Some analytic models of the total mass density profile were examined .
The ICM density profile was also specified by analytic forms .
The ICM temperature distribution was constrained to satisfy the hydrostatic equilibrium , and to be consistent with the data .
Then , the total mass distribution was found to be described better by the universal dark halo profile proposed by Navarro , Frenk , and White ( 1996 ; 1997 ) than by a King-type model with a flat density core .
A profile with a central cusp together with a logarithmic radial slope of \sim 1.5 was also consistent with the data .
Discussions are made concerning the estimated dark matter distribution around the cluster center .