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LINKING GAS FRACTIONS TO BMODALITIES IN GALAXY PROPERTIES

机译:将天然气馏分与银河系中的双峰联系起来

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摘要

Galaxies over 4 decades in stellar mass are shown to obey a strong correlation between u — K colors and atomic-gas-to-stellar mass ratios (G/S), using stellar mass-to-light ratios derived from optical colors. The correlation holds for G/S ranging from nearly 10 : 1 to 1 : 100 for a sample obtained by merging the SDSS DR2, 2MASS, and HyperLeda H I catalogs. This result implies that u — K colors can be calibrated to provide "photometric gas fractions" for statistical applications. Here this technique is applied to a sample of ~ 35,000 SDSS-2MASS galaxies to examine the relationship of gas fractions to observed bimodalities in galaxy properties as a function of color and stellar mass. The recently identified transition in galaxy properties at stellar masses ~(2-3) x 10~(10) solar mass corresponds to a shift in gas richness, dividing low-mass late-type galaxies with G/S ~ 1 : 1 from high-mass galaxies with intermediate-to-low G/S. Early-type galaxies below the transition mass also show elevated G/S, consistent with formation scenarios involving mergers of low-mass gas-rich systems and/or cold-mode gas accretion.
机译:使用源自光学颜色的恒星质量与光之比,超过4年的恒星质量星系显示出服从u-K颜色与原子-气体-恒星质量比(G / S)之间的强相关性。对于通过合并SDSS DR2、2MASS和HyperLeda H I目录获得的样本,G / S的相关性范围从接近10:1到1 :: 100。该结果意味着可以对u-K颜色进行校准,以提供用于统计应用的“光度气体分数”。在这里,这项技术被应用于约35,000个SDSS-2MASS星系的样本,以检验气体分数与星系性质中观察到的双峰态之间的关系,该关系是颜色和恒星质量的函数。最近发现的恒星质量〜(2-3)x 10〜(10)的星系性质的转变对应于气体富集的变化,将G / S〜1:1的低质量晚期星系从高质量划分为高。高/低G / S的质量星系。低于过渡质量的早期星系也显示出较高的G / S,这与涉及低质量富气系统和/或冷模式增生合并的形成场景一致。

著录项

  • 来源
    《The Astrophysical journal》 |2004年第2pt2期|p.L89-L92|共4页
  • 作者

    SHEILA J. KANNAPPAN;

  • 作者单位

    McDonald Observatory, The University of Texas at Austin, 1 University Station C1402, Austin, TX 78712-0259;

  • 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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