X-ray exploration of the outskirts of the nearby Centaurus cluster using Suzaku and Chandra
S. A. Walker, A. C. Fabian, J. S. Sanders, A. Simionescu, Y. Tawara

TL;DR
This study uses Suzaku and Chandra X-ray observations to analyze the outskirts of the Centaurus cluster, revealing temperature, entropy, and pressure profiles, and addressing gas clumping effects to improve understanding of cluster outskirts.
Contribution
First combined Suzaku and Chandra analysis of the Centaurus cluster outskirts, reducing background uncertainties and exploring gas clumping effects on entropy and pressure profiles.
Findings
Temperature decreases by a factor of 2 from peak to outskirts.
Entropy profile shows central excess and slight deviation in outskirts.
Gas mass fraction reaches cosmic baryon fraction at large radii.
Abstract
We present Suzaku observations of the Centaurus cluster out to 0.95r200, taken along a strip to the north west. We have also used congruent Chandra observations of the outskirts to resolve point sources down to a threshold flux around 7 times lower than that achievable with just Suzaku data, considerably reducing the systematic uncertainties in the cosmic X-ray background emission in the outskirts. We find that the temperature decreases by a factor of 2 from the peak temperature to the outskirts. The entropy profile demonstrates a central excess (within 0.5r200) over the baseline entropy profile predicted by simulations of purely gravitational hierarchical structure formation. In the outskirts the entropy profile is in reasonable agreement with the baseline entropy profile from Voit et al., but lies slightly below it. We find that the pressure profile agrees with the universal pressure…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
