Eri Sakuma, Naomi Ota, Kosuke Sato, Takuya Sato, Kyoko Matsushita
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.
View original:
http://arxiv.org/abs/1108.1895
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