Study of the Large-scale Temperature Structure of the Perseus Cluster with Suzaku

TL;DR

This study uses Suzaku's X-ray data to analyze the large-scale temperature distribution of the Perseus cluster, finding no evidence of extremely hot gas or recent major mergers, thus suggesting a relatively relaxed state.

Contribution

First detailed large-scale temperature mapping of the Perseus cluster using Suzaku's HXD-PIN data with careful spectral analysis.

Findings

Upper temperature limit in outer regions is ~14 keV

No detection of extremely hot gas as in other clusters

Indicates Perseus has not undergone recent major mergers

Abstract

We report on a study of the large-scale temperature structure of the Perseus cluster with Suzaku, using the observational data of four pointings of 30' offset regions, together with the data from the central region. Thanks to the Hard X-ray Detector (HXD-PIN: 10 - 60 keV), Suzaku can determine the temperature of hot galaxy clusters. We performed the spectral analysis, by considering the temperature structure and the collimator response of the PIN correctly. As a result, we found that the upper limit of the temperature in the outer region is $\sim$ 14 keV, and an extremely hot gas, which was reported for RXJ 1347.5-1145 and A 3667, was not found in the Perseus cluster. This indicates that the Perseus cluster has not recently experienced a major merger.