Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-05-19
Publ.Astron.Soc.Jap.61:S353-S363,2009
Astronomy and Astrophysics
Astrophysics
12 pages, 10 figures, accepted for publication in PASJ
Scientific paper
Temperature and abundance distributions of the intra-cluster medium (ICM) in the NGC 507 group of galaxies were studied with Suzaku. Observed concentric annular spectra were well-represented by a two temperature model for ICM, and we found steeper abundance gradients for Mg, Si, S, and Fe compared with O in the central region. Abundance ratios of alpha-elements to iron were found to be similar to those in other groups and poor clusters. We calculated metal mass-to-light ratios for Fe, O and Mg (IMLR, OMLR, MMLR) for NGC 507, and values for different systems were compared. Hotter and richer systems tend to show higher values of IMLR, OMLR, and MMLR. OMLR and MMLR were measured to an outer region for the first time with Suzaku, while IMLR was consistent with that with ASCA. We also looked into 2-dimensional map of the hardness ratio, but found no significant deviation from the circular symmetry.
Ishida Manabu
Ishisaki Yoshitaka
Matsushita Kyoko
Ohashi Takaya
Sato Kosuke
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