Uniformity in the temperature and metallicity of the X-ray emitting gas in the Abell 1060 cluster of galaxies

被引:41
作者
Tamura, T
Day, CS
Fukazawa, Y
Hatsukade, I
Ikebe, Y
Makishima, K
Mushotzky, RF
Ohashi, T
Takenaka, K
Yamashita, K
机构
[1] NASA, GODDARD SPACE FLIGHT CTR, GREENBELT, MD 20771 USA
[2] MIYAZAKI UNIV, FAC ENGN, MIYAZAKI 88921, JAPAN
[3] INST PHYS & CHEM RES, COSM RADIAT LAB, WAKO, SAITAMA 35101, JAPAN
[4] TOKYO METROPOLITAN UNIV, DEPT PHYS, HACHIOJI, TOKYO 19203, JAPAN
[5] NAGOYA UNIV, DEPT ASTROPHYS, SCH SCI, CHIKUSA KU, NAGOYA, AICHI 46401, JAPAN
关键词
galaxies; abundances; clustering; clusters; individual; (Abell; 1060); X-rays;
D O I
10.1093/pasj/48.5.671
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The results from ASCA observations of the Abell 1060 cluster of galaxies are presented. Spatially sorted X-ray spectra were used to derive the distributions of the temperature and metallicity in the X-ray emitting gas of the cluster. Within similar to 20' (or 400 kpc assuming H-0 = 50 km s(-1) Mpc(-1)) of the cluster center, the gas temperature has been found to be radially constant at 3.1(-0.5)(+0.3) keV (or 3.1 +/- 0.2 keV within similar to 10'), and the 2-10 keV luminosity was estimated to be 2 x 10(43) erg s(-1). An upper limit on the cool emission component at the cluster center was derived to be 6 x 10(41) erg s(-1) in 0.5-3 keV, assuming that it has a temperature of 1 keV. Although the metallicity is consistent with being radially constant at 0.3 relative to solar value, the present observations do not constrain the abundance well beyond 10', allowing values in the range from 0.2 to 0.4 solar value. There is some indication that O, Ne, and Si are more abundant than Fe and Ni, when compared to the solar-abundance ratios. These results suggest the importance of galactic winds driven by type-II supernovae during the early phase of galaxy formation. In comparison with the Centaurus and Virgo clusters, discussions are made concerning the possible role of the cD galaxy in generating a metal concentration and a cool X-ray component at the cluster center.
引用
收藏
页码:671 / 677
页数:7
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