M以上和M以下星系性质与环境关系的比较
Comparisons of the environmental dependence of galaxy properties between galaxies above and below M
摘要：
从Sloan数字巡天数据第6版（SDSS DR 6）的主星系样本中，构造了M值以上和M值以下的两个有限体积样本，探讨了M值以上和M值以下星系性质对环境依赖性的差异。我们测量了一个半径为每个星系到第5个最近星系的距离的共动球中的局部三维星系密度，并比较了最低密度区星系与密度区星系的基本性质。结果表明，只有在M以上的星系，其光度对局部环境的依赖性很强，而在M以下的星系，这种依赖性很弱。值得注意的是，对于所有不同光度的星系，g-r色、集中指数ci和星系形态都强烈依赖于局部环境。这表明，M是一个特征参数，只有对星系光度的环境依赖性。
英文摘要：
From the Main galaxy sample of the Sloan Digital Sky Survey Data Release 6 (SDSS DR6), we construct two volume-limited samples above and below the value of M, to explore the difference of the environmental dependence of galaxy properties between galaxies above and below the value of M . We measure the local three-dimensional galaxy density in a comoving sphere with a radius of the distance to the 5th nearest galaxy for each galaxy, and compare basic properties of galaxies in the lowest density regime with those of galaxies in the densest regime. It is found that the galaxy luminosity strongly depend on local environments only for galaxies above M, but this dependence is very weak for galaxies below M . It is worth noting that g-r color, concentration index ci and galaxy morphologies strongly depend on local environments for all galaxies with different luminosities. This shows that M is an characteristic parameter only for the environmental dependence of galaxy luminosity.
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