The Environmental Dependence of Galaxy Properties in the Local Universe: Dependences on Luminosity, Local Density, and System Richness
The Environmental Dependence of Galaxy Properties in the Local Universe: Dependences on Luminosity, Local Density, and System Richness
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DOI：
10.1086/425529
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发表时间：
2004-11
期刊：
影响因子：
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通讯作者：
Masayuki Tanaka;T. Goto;S. Okamura;K. Shimasaku;J. Brinkmann
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文献类型：
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作者：
Masayuki Tanaka;T. Goto;S. Okamura;K. Shimasaku;J. Brinkmann
我们研究了星星形成的环境依赖性和星系的形态在本地宇宙的基础上，从斯隆数字巡天的数据构建的体积有限的样本。样本星系（共19，714个）的红移范围仅为0.030 200 km s-1，不依赖于系统丰富度，这些系统中的大多数星系都是非成星的早型星系。星系的星星形成活动不同于场星系，即使是在σ <$100 km s-1这样低的系统中也是如此。这一结果表明，只有在丰富的系统中才有效的环境机制，如冷气体的冲压压力剥离和骚扰，在将星系转化为红色早型星系中并没有发挥重要作用。然而，星系之间的相互作用和相互作用仍然是环境依赖性的驱动因素。在局域宇宙的稠密环境中，暗星系的缓慢转变在一定程度上发生，但亮星系的转变并不清晰可见。我们认为亮星系的演化与星系团、星系团等星系系统的关系并不密切，而暗星系的演化则可能与星系系统有着密切的联系。
We investigate the environmental dependence of star formation and the morphology of galaxies in the local universe based on a volume-limited sample constructed from the data of the Sloan Digital Sky Survey. The sample galaxies (19,714 in total) are restricted to the redshift range of 0.030 200 km s-1 show no dependence on system richness, and most of the galaxies in those systems are non–star-forming early-type galaxies. Star formation activities of galaxies are different from those of field galaxies even in systems as poor as σ ∼ 100 km s-1. This result suggests that environmental mechanisms that are effective only in rich systems, such as ram pressure stripping of cold gas and harassment, have not played a major role in transforming galaxies into red early-type galaxies. Strangulation and interactions between galaxies, however, remain candidates of the driver of the environmental dependence. In the dense environment in the local universe, the slow transformation of faint galaxies occurs to some extent, but the transformation of bright galaxies is not clearly visible. We suggest that the evolution of bright galaxies is not strongly related to galaxy system, such as groups and clusters, while the evolution of faint galaxies is likely to be closely connected to galaxy system.