We present a detailed spectral and spatial analysis of the galaxy cluster PKS 0745-191 , using recent observations from the Chandra X-ray Observatory .
The data provide information on the temperature and metallicity of the intracluster medium , the distribution of emission throughout the cluster , morphology of the cluster core , and an independent mass estimate which can be compared to that from gravitational lensing .
X-ray spectra extracted from the central 300 kpc ( \sim 2 \arcmin ) are well described by a two-temperature plasma and the mean cluster temperature is consistent with previously determined values .
The distribution of both temperature and metallicity within the inner 360 kpc ( 2.3 \arcmin ) of PKS 0745-191 is probed on scales of 8 \arcsec ( \sim 20 kpc ) , yielding a relatively constant abundance throughout the region and a strong temperature gradient ( down to \sim 4-5 keV ) within the central 215 kpc . \beta -model fits to the surface brightness profile of PKS 0745-191 indicate that a second \beta -model component is required to fit the inner \sim 10 kpc .
Imaging analysis of the cluster core reveals an irregular morphology within the inner 50 kpc , and confirms that the X-ray emission peak lies within 0.5 \arcsec ( the spatial resolution of Chandra ) of both the optical and radio central cD positions .
The cluster mass , based on both two temperature and multiphase fits to the X-ray spectrum , is in close agreement with lensing mass estimates of PKS-0745-191 .