Chandra analysis and mass estimation of the lensing cluster of galaxies Cl 0024+17

We present a detailed analysis of Chandra X-ray observations of the lensing cluster of galaxies Cl 0024+17 at z = 0.395. We found that the radial temperature profile is consistent with being isothermal out to ∼600 kpc and that the average X-ray temperature is 4.47_-0.54^+0.83 keV. The X-ray surface brightness profile is represented by the sum of extended emission centered at the central bright elliptical galaxy with a small core of 50 kpc and more extended emission that can be well described by a spherical β-model with a core radius of about 210 kpc. Assuming the X-ray-emitting gas to be in hydrostatic equilibrium, we estimated the X-ray mass within the arc radius and found that it is significantly smaller than the strong lensing mass by a factor of about 2-3. We detected a strong redshifted iron K line in the X-ray spectrum from the cluster for the first time and found the metal abundance to be 0.76_-0.31^+0.37 solar.