Suzaku X-ray Observations of the Nearest Non-Cool Core Cluster, Antlia: Dynamically Young but with Remarkably Relaxed Outskirts
Ka-Wah Wong, Jimmy A. Irwin, Daniel R. Wik, Ming Sun, Craig L., Sarazin, Yutaka Fujita, Thomas H. Reiprich

TL;DR
This study uses Suzaku X-ray observations to analyze the Antlia Cluster's outskirts, revealing it is dynamically young yet remarkably relaxed, with entropy and gas fraction profiles consistent with gravity-only models and no significant gas clumping.
Contribution
First detailed X-ray analysis of the nearest non-cool core cluster's outskirts, showing consistency with gravity heating models and providing new scaling relations for low-mass clusters.
Findings
Antlia's temperature and pressure profiles match universal profiles.
Entropy increases to R_200, aligning with gravity-only models.
No significant gas clumping or non-equipartition detected.
Abstract
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 its degree-scale virial radius in its eastern direction. The temperature is consistent with the scaled profiles of many other clusters. Its pressure follows the universal profile. The density slope in its outskirts is significantly steeper than that of the nearest cool core cluster (Virgo) with a similar temperature as Antlia, but shallower than those of the massive clusters. The entropy increases all the way out to R_200, which is consistent in value with the baseline model predicted by a gravity heating-only mechanism in the outskirts. Antlia is quite relaxed in this direction. However, the entropy inside ~R_500 is significantly higher than the baseline model, which is similar to many other nearby low mass clusters or groups. The…
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