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THE DEPENDENCE OF GALAXY MORPHOLOGY AND STRUCTURE ON ENVIRONMENT AND STELLAR MASS

机译:银河形态和结构对环境和星体质量的依赖性

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摘要

From the Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5), we extract a sample of 4594 galaxies at redshifts 0.02 < z < 0.03, complete down to a stellar mass of M = 10~(10) solar mass. We quantify their structure (Sersic index), morphology (Sersic index + "Bumpiness"), and local environment. We show that morphology and structure are intrinsically different galaxy properties, and we demonstrate that this is a physically relevant distinction by showing that these properties depend differently on galaxy mass and environment. Structure mainly depends on galaxy mass whereas morphology mainly depends on environment. This is driven by variations in star formation activity, as traced by color, which only weakly affects the structure of a galaxy but strongly affects its morphological appearance. The implication of our results is that the existence of the morphology-density relation is intrinsic and not just due to a combination of more fundamental, underlying relations. Our findings have consequences for high-redshift studies, which often use some measure of structure as a proxy for morphology. A direct comparison with local samples selected through visually classified morphologies may lead to biases in the inferred evolution of the morphological mix of the galaxy population, and misinterpretations in terms of how galaxy evolution depends on mass and environment.
机译:从Sloan数字天空调查(SDSS)数据发布5(DR5)中,我们提取了红移0.02 <z≤0.03的4594个星系样本,完全分解为恒星质量M = 10〜(10)太阳质量。我们量化它们的结构(Sersic指数),形态(Sersic指数+“凸凹度”)和局部环境。我们表明形态和结构本质上是不同的星系属性,并且通过显示这些属性对星系质量和环境的依赖程度不同,证明了这是物理上相关的区别。结构主要取决于星系质量,而形态主要取决于环境。这是由颜色所跟踪的恒星形成活动的变化所驱动的,这种变化仅对银河的结构产生微弱的影响,而对银河的形态外观则产生强烈的影响。我们的结果意味着,形态密度关系的存在是内在的,而不仅仅是由于更基本的基础关系的组合。我们的发现对高红移研究具有重要意义,该研究经常使用某种结构度量来替代形态。与通过视觉分类形态选择的本地样本的直接比较可能会导致推断银河系种群形态混合的偏向,并可能误解银河系演化如何取决于质量和环境。

著录项

  • 来源
    《The Astrophysical journal》 |2008年第2期|p.L13-L16|共4页
  • 作者

    Arjen van der Wel;

  • 作者单位

    Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 天文学;
  • 关键词

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