Multicolor Photometry of the Galaxies in the Central Region of Abell 2634
Multicolor Photometry of the Galaxies in the Central Region of Abell 2634
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DOI：
10.1086/323302
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发表时间：
2001-10
期刊：
影响因子：
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通讯作者：
Q. Yuan;Xu Zhou;Jian-sheng Chen;Zhao-ji Jiang;Jun Ma;Hong Wu;S. Xue;Jin Zhu
中科院分区：
文献类型：
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作者：
Q. Yuan;Xu Zhou;Jian-sheng Chen;Zhao-ji Jiang;Jun Ma;Hong Wu;S. Xue;Jin Zhu
利用北京-亚利桑那-台北-康涅狄格多色系统对附近星系团Abell 2634的中心区域进行了光学光度观测。从具有14个滤光片的2K × 2K CCD图像中，覆盖了3600至10000 Å的波长范围，在56′ × 视场内检测到了5572个低至V ∼ 20 mag的源。 56′以这个规则的星系团为中心。结果，我们获得了所有检测到的光源的光谱能量分布 (SED)。我们的观测中包括 178 个先前已知的星系，其中 147 个在文献中已知其径向速度。排除前景和背景星系后，形成 124 个已知成员的样本，用于研究 SED 属性。观测到的早期型成员星系的 SED 与模板 SED 的比较证明了我们的光度测量的准确性和可靠性。基于对成员星系SED特性的了解，我们对属于Abell 2634的微弱星系进行了选择。这很好地表明了颜色-颜色图在星-星系分离中的强大作用。结果，根据颜色特征选择了 359 个微弱星系。将早期型星系的光度红移和色星等相关技术应用于这些暗星系，得到了74个暗成员星系的列表。基于新生成的成员星系样本，讨论了Abell 2634核心区星系的空间分布和色星等关系。早期型成员的颜色指数色散在外围区域存在较大的趋势，这可能反映了环境对星团内星系演化影响的一些线索。
An optical photometric observation with the Beijing-Arizona-Taipei-Connecticut multicolor system is carried out for the central region of the nearby cluster of galaxies Abell 2634. From the 2K × 2K CCD images with 14 filters, which cover a range of wavelength from 3600 to 10000 Å, 5572 sources are detected down to V ∼ 20 mag in a field of 56′ × 56′ centered on this regular cluster of galaxies. As a result, we achieved the spectral energy distributions (SEDs) of all sources detected. There are 178 previously known galaxies included in our observations, 147 of which have known radial velocities in the literature. After excluding the foreground and background galaxies, a sample of 124 known members is formed for an investigation of the SED properties. The comparison of observed SEDs of the early-type member galaxies with the template SEDs demonstrates the accuracy and reliability of our photometric measurements. Based on the knowledge of SED properties of member galaxies, we performed the selection of faint galaxies belonging to Abell 2634. It is well shown that the color-color diagrams are powerful in the star-galaxy separation. As a result, 359 faint galaxies are selected by their color features. The technique of photometric redshift and color-magnitude correlation for the early-type galaxies are applied for these faint galaxies, and a list of 74 faint member galaxies is achieved. On the basis of the newly generated sample of member galaxies, the spatial distribution and color-magnitude relation of the galaxies in the core region of Abell 2634 are discussed. There exists a tendency that the color index dispersion of the early-type members is larger for the outer region, which might reflect some clues about the environmental effect on the evolution of galaxies in a cluster.