Multicolor photometry of the galaxy cluster A98: substructures and star formation properties

Multicolor photometry of the galaxy cluster A98: substructures and star formation properties
复制标题

星系团 A98 的多色光度测量:子结构和恒星形成特性

DOI:
10.1088/1674-4527/10/1/001
复制
发表时间:
2009-09
影响因子:
1.8
通讯作者:
Wu, Jiang-Hua
Wu, Jiang-Hua
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Yuan, Qi-Rong;Zhou, Xu;Jiang, Zhao-Ji;Wu, Zhen-Yu;Ma, Jun;Yang, Yan-Bin;Zhang, Li;Wu, Jiang-Hua

文献摘要

参考文献

相似文献

利用北京-亚利桑那州-台湾-康涅狄格州(BATC)多色系统对A98(z=0.104)星系团进行了光学测光观测。在58∼×58�的场强下,得到了V�~(20)的所有源的15个中间带的光谱能量分布(SED)。在用颜色-颜色图将恒星-星系分离后,将光度红移技术应用于星系样本,以进一步确定成员。颜色-星等关系被认为是对早期类型星系团的进一步限制。结果,获得了198个微弱成员星系的列表。基于新产生的成员星系样本,详细研究了A98N、A98S和A98W的动力子结构。在A98的主要集中点以南也发现了一个分离速率的星系群,A98X,它的引力不受A98的约束。对于74个光谱确认的成员星系,研究了环境对恒星形成历史的影响。发现核心区的亮星系具有较短的恒星形成时间尺度、较长的平均恒星年龄和较高的星际介质金属丰度,这可以在分级宇宙学的背景下解释。
An optical photometric observation with the Beijing-Arizona-Taiwan- Connecticut (BATC) multicolor system is carried out for A98 (z =0 .104), a galaxy cluster with two large enhancements in X-ray surface brightness. Spectral energy dis- tributions (SEDs) covering15 intermediate bands are obtained for all sources detected down to V ∼ 20 mag in a field of 58 � × 58 � . After star-galaxy separation with color- color diagrams, a photometric redshift technique is applied to the galaxy sample for further membership determination. The color-magnitude relation is taken as a further restriction of the early-type cluster galaxies. As a result, a list of 198 faint member galaxies is achieved. Based on the newly generated sample of member galaxies, the dynamical substructures, A98N, A98S, and A98W, are investigated in detail. A sepa- rate galaxy group, A98X, is also found to the south of the main concentration of A98, which is gravitationally unbound to A98. For 74 spectroscopically confirmed member galaxies, the environmental effect on the star formation history is investigated. The bright galaxies in the core region are found to have shorter time scales of star forma- tion, longer mean stellar ages, and higher interstellar medium metallicities, which can be interpreted in the context of the hierarchical cosmological scenario.
DOI: 10.1086/323302
发表时间: 2001-10
期刊: The Astronomical Journal
影响因子: --
作者:
Q. Yuan;Xu Zhou;Jian-sheng Chen;Zhao-ji Jiang;Jun Ma;Hong Wu;S. Xue;Jin Zhu
通讯作者: Q. Yuan;Xu Zhou;Jian-sheng Chen;Zhao-ji Jiang;Jun Ma;Hong Wu;S. Xue;Jin Zhu
DOI: 10.1086/172718
发表时间: 1993-06
期刊: The Astrophysical Journal
影响因子: --
作者:
E. Salvador-Solé;G. González‐Casado;J. Solanes
通讯作者: E. Salvador-Solé;G. González‐Casado;J. Solanes
DOI: 10.1086/316829
发表时间: 2000-11
期刊: The Astronomical Journal
影响因子: --
作者:
J. Pinkney;J. Burns;M. Ledlow;P. Gomez;J. Hill
通讯作者: J. Pinkney;J. Burns;M. Ledlow;P. Gomez;J. Hill
DOI: 10.1086/115982
发表时间: 1991
期刊: The Astronomical Journal
影响因子: --
作者:
T. Beers;K. Gebhardt;W. Forman;J. Huchra;C. Jones
通讯作者: T. Beers;K. Gebhardt;W. Forman;J. Huchra;C. Jones
DOI: 10.1093/mnras/174.1.29p
发表时间: 1976
影响因子: 4.8
作者:
D. Allen
通讯作者: D. Allen