Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-08-09
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
13 pages, 11 figures, accepted for publication in PASJ
Scientific paper
We report the first observations of metal distributions in the intracluster medium of the Centaurus cluster up to ~0.17 r_180 with Suzaku. Radial profiles of the O, Mg, Si, S, Ar, Ca, and Fe were determined at the outer region of the cluster, and their variations appear to be similar to each other. Within the cool core region (r<0.045 r_ 180), all the metal distributions sharply increased toward the center. In the central region (r<0.015 r_180), the abundances of Si, S, Ar, Ca, and Fe were 1.5--1.8 solar, while those of O and Mg were approximately 1 solar. The derived abundance ratios of O and Mg to Fe were slightly lower than those of a set of other clusters. In contrast, the calculated mass-to-light ratios (MLRs) for O, Mg, and Fe were larger than those of the other clusters. For the outer region of the cool core (r>0.07 r_180), all the abundances were almost constant at 0.5 solar. The derived MLRs were comparable to those of the other clusters. This suggests that the cD galaxy of the Centaurus cluster efficiently supplies more Fe than the other clusters.
Matsushita Kyoko
Ota Naomi
Sakuma Eri
Sato Kosuke
Sato Takuya
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