Temperature and Metallicity in the Intra-cluster Medium of ABELL 262 observed with Suzaku - AstrophysicsReport as inadecuate




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Abstract: We studied the temperature and abundance distributions of intra-clustermedium ICM in the Abell 262 cluster of galaxies observed with Suzaku. Abell262 is a bright, nearby poor cluster with ICM temperature of ~2 keV, thusproviding useful information about the connection of ICM properties betweengroups and clusters of galaxies. The observed spectrum of the central regionwas well-represented by two temperature models, and the spectra for the outerregions were described by single temperature model. With the XIS instrument, wedirectly measured not only Si, S, and Fe lines but also O and Mg lines andobtained those abundances to an outer region of ~0.43 r 180 for the first time.We found steep gradients for Mg, Si, S, and Fe abundances, while O showedalmost flat abundance distribution. Abundance ratios of alpha-elements to Fewere found to be similar to those of the other clusters and groups. Wecalculated the number ratio of type II to type Ia supernovae for the ICMenrichment to be 3.0 +- 0.6 within 0.1 r 180, and the value was consistent withthose for other clusters and groups. We also calculated metal mass-to-lightratios MLRs for Fe, O and Mg IMLR, OMLR, MMLR with B-band and K-bandluminosities of the member galaxies of Abell 262. The derived MLRs werecomparable to those for other clusters with kT = 3-4 keV.



Author: Kosuke Sato, Kyoko Matsushita, Fabio Gastaldello

Source: https://arxiv.org/







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