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To investigate the present situation of the merging in the southern outerregion of Abell 85, we carried out long (~100 ks) observations with Suzaku, andproduced an X-ray hardness ratio map. We found a high hardness ratio peak inthe east side of a subcluster located in the south of the cluster; an X-rayspectrum of the region including this peak indicates a high temperature of ~8.5keV. This hot spot has not been reported so far. We consider that this hot spotis a postshock region produced by the infall of the subcluster from thesouthwest. By using the Rankine--Hugoniot jump conditions for shocks, the Machnumber and the infall velocity of the subcluster are obtained as 1.5 +/- 0.2and 1950^{+290}_{-280} km s^{-1}, respectively, in the case of merging with thesubcluster from the southwest direction. By using the redshift differencebetween the A 85 and the subcluster obtained from optical observations, theangle between the line of sight and the direction of the motion of thesubcluster is estimated to be 75^{+7}_{-8} degrees. We estimate the kineticenergy of the subcluster and the energy used for intracluster medium (ICM)heating to be ~10^{63} and \lesssim 8 \times 10^{60} erg, respectively. Thisshows that the deceleration of the subcluster by ICM heating has beennegligibly small.

Suzaku Observations of the Merging Cluster Abell 85: Temperature Map and Impact Direction