ASCA observations of the lensing clusters CL 0500-24, CL 2244-02, and A370: Mass determinations and comparisons

ASCA observations of three gravitational lensing clusters, CL 0500-24, CL 2244-02, and A370, are presented. The X-ray temperatures of the three clusters are determined, respectively, at 7.2 (5.4-10.9), 6.5 (5.2-8.3), and 6.6 (5.7-7.7) keV (90% error), while the X-ray luminosities are determined to be 1.7, 1.3, and 8.3 x 10(44) ergs s(-1) in the 2-10 keV band. We also obtained significant constraints on the surface brightness profile assuming the beta-model and the King model (i.e., the beta-model with beta = 1) profiles. The mass of the cluster estimated from these X-ray data is smaller by a factor of 2-3 than the mass estimated from lens models for two of the clusters, CL 0500-24 and A370, while the two independent mass estimates are consistent with each other for CL 2244-02. We suspect that the major cause of mass discrepancy of CL 0500-24 and A370 is in the projection effect of substructures of these clusters.