Galaxy pairs in the Sloan Digital Sky Survey – III. Evidence of induced star formation from optical colours
Galaxy pairs in the Sloan Digital Sky Survey – III. Evidence of induced star formation from optical colours
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DOI：
10.1111/j.1365-2966.2010.17932.x
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发表时间：
2010-10
影响因子：
4.8
通讯作者：
D. Patton;S. Ellison;L. Simard;A. McConnachie;J. Mendel
中科院分区：
文献类型：
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作者：
D. Patton;S. Ellison;L. Simard;A. McConnachie;J. Mendel
我们已经从斯隆数字巡天数据发布7中收集了一个大的，高质量的星系颜色目录，并确定了21，347个星系对，跨越了一系列投影分离（rp < 80 h −1 70 kpc），相对速度（<10，000 km s −1，其中包括质量控制所必需的投影对）和恒星质量比（从1：10到10：1）。我们发现，星系对中的红色部分是高于控制样本匹配的恒星质量和红移，并证明这种差异可能是由于这样一个事实，即星系对居住在更高的密度环境比非配对星系。我们检测到明确的迹象，相互作用引起的恒星形成的蓝色星系内的配对，证明了极蓝色星系的比例较高，沿着与蓝色的配对与控制星系的颜色之间的偏移。这些符号在紧密配对中最强（rp < 30 h −1
We have assembled a large, high quality catalogue of galaxy colours from the Sloan Digital Sky Survey Data Release 7, and have identified 21,347 galaxies in pairs spanning a range of projected separations (rp < 80 h −1 70 kpc), relative velocities (�v < 10, 000 km s −1 , which includes projected pairs that are essential for quali ty control), and stellar mass ratios (from 1:10 to 10:1). We find that the red fraction of galaxies i n pairs is higher than that of a control sample matched in stellar mass and redshift, and demonstrate that this difference is likely due to the fact that galaxy pairs reside in higher dens ity environments than non-paired galaxies. We detect clear signs of interaction-induced sta r formation within the blue galaxies in pairs, as evidenced by a higher fraction of extremely blue galaxies, along with blueward offsets between the colours of paired versus control galaxies. These signs are strongest in close pairs (rp < 30 h −1