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We studied the temperature and metal abundance distributions of theintra-cluster medium (ICM) in a group of galaxies NGC 1550 observed withSuzaku. The NGC 1550 is classified as a fossil group, which have few brightmember galaxies except for the central galaxy. Thus, such a type of galaxy isimportant to investigate how the metals are enriched to the ICM. With theSuzaku XIS instruments, we directly measured not only Si, S, and Fe lines butalso O and Mg lines and obtained those abundances to an outer region of ~0.5r_180 for the first time, and confirmed that the metals in the ICM of such afossil group are indeed extending to a large radius. We found steeper gradientsfor Mg, Si, S, and Fe abundances, while O showed almost flat abundancedistribution. Abundance ratios of alpha-elements to Fe were similar to those ofthe other groups and poor clusters. We calculated the number ratio of type IIto type Ia supernovae for the ICM enrichment to be 2.9 +- 0.5 within 0.1 r_180,and the value was consistent with those for the other groups and poor clustersobserved with Suzaku. We also calculated metal mass-to-light ratios (MLRs) forFe, O and Mg with B-band and K-band luminosities of the member galaxies of NGC1550. The derived MLRs were comparable to those of NGC 5044 group in the r<0.1r_180 region, while those of NGC 1550 are slightly higher than those of NGC5044 in the outer region.

Metallicity of the Fossil Group NGC 1550 Observed with Suzaku