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THE ELLIPTICITY OF THE DISKS OF SPIRAL GALAXIES

机译:螺旋星系盘的椭圆率

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摘要

The disks of spiral galaxies are generally elliptical rather than circular. The distribution of ellipticities can be fitted with a lognormal distribution. For a sample of 12,764 galaxies from the Sloan Digital Sky Survey Data Release 1 (SDSS DR1), the distribution of apparent axis ratios in the i band is best fit by a lognormal distribution of intrinsic ellipticities with ln ε=-1.85 +- 0.89. For a sample of nearly face-on spiral galaxies analyzed by Andersen & Bershady using both photometric and spectroscopic data, the best-fitting distribution of ellipticities has ln ε = -2.29 +- 1.04. Given the small size of the Andersen & Bershady sample, the two distributions are not necessarily inconsistent with each other. If the ellipticity of the potential were equal to that of the light distribution of the SDSS DR1 galaxies, it would produce 1.0 mag of scatter in the Tully-Fisher relation, greater than is observed. The Andersen & Bershady results, however, are consistent with a scatter as small as 0.25 mag in the Tully-Fisher relation.
机译:螺旋星系的圆盘通常是椭圆形而不是圆形。椭圆度的分布可以与对数正态分布拟合。对于来自斯隆数字天空测量数据版本1(SDSS DR1)的12,764个星系的样本,i波段中视轴比率的分布最适合因数椭圆率的对数正态分布,lnε= -1.85 +-0.89。对于由安德森(Andersen)和贝沙迪(Bershady)使用光度和光谱数据分析的近乎面对的螺旋星系的样本,椭圆度的最佳拟合分布为lnε= -2.29 +-1.04。鉴于Andersen&Bershady样本的规模较小,两个分布不一定相互矛盾。如果电势的椭圆率等于SDSS DR1星系的光分布的椭圆率,那么它将以Tully-Fisher关系产生1.0 mag的散射,大于所观察到的。但是,Andersen&Bershady的结果与Tully-Fisher关系中的小至0.25 mag的散射一致。

著录项

  • 来源
    《The Astrophysical journal》 |2004年第1期|p.214-220|共7页
  • 作者

    BARBARA S. RYDEN;

  • 作者单位

    Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210;

  • 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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