Chandra Spectroscopy and Mass Estimation of the Lensing Cluster of   Galaxies CL0024+17
  We present the X-ray analysis and the mass estimation of the lensing cluster of galaxies CL0024+17 with Chandra. We found that the temperature profile is consistent with being isothermal and the average X-ray temperature is 4.47 (+0.83, -0.54) keV. The X-ray surface brightness profile is represented by the sum of emissions associated with the central three bright elliptical galaxies and the emission from intracluster medium (ICM) which can be well described by a spherical beta-model. Assuming the ICM to be in the hydrostatic equilibrium, we estimated the X-ray mass and found it is significantly smaller than the strong lensing mass by a factor of 3. 
Naomi Ota (1,3), Makoto Hattori (2), Etienne Pointecouteau (2), and   Kazuhisa Mitsuda (3) ((1)Tokyo Metropolitan University...