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We present the results of seven Suzaku mosaic observations (>200 ks in total)of the nearest non-cool core cluster, the Antlia Cluster (or Group), beyond itsdegree-scale virial radius in its eastern direction. The temperature isconsistent with the scaled profiles of many other clusters. Its pressurefollows the universal profile. The density slope in its outskirts issignificantly steeper than that of the nearest cool core cluster (Virgo) with asimilar temperature as Antlia, but shallower than those of the massiveclusters. The entropy increases all the way out to R_200, which is consistentin value with the baseline model predicted by a gravity heating-only mechanismin the outskirts. Antlia is quite relaxed in this direction. However, theentropy inside ~R_500 is significantly higher than the baseline model, which issimilar to many other nearby low mass clusters or groups. The enclosed gas-massfraction does not exceed the cosmic value out to 1.3R_200. Thus, there is noevidence of significant gas clumping, electron-ion non-equipartition, ordeparture from the hydrostatic equilibrium approximation that are suggested toexplain the entropy and gas fraction anomalies found in the outskirts of somemassive clusters. We also present scaling relations for the gas fraction(f_gas,200), entropy (K_200), and temperature (T_500) using 22 groups andclusters with published data in the literature. The enclosed baryon fraction atR_200 is broadly consistent with the cosmic value. The power law slope of theK_200-T_500 relation is 0.638+/-0.205. The entropy deficit at R_200 cannot befully accounted for by the bias or deviation in the gas fraction.

Suzaku X-ray Observations of the Nearest Non-Cool Core Cluster, Antlia: Dynamically Young but with Remarkably Relaxed Outskirts