Shape alignments of satellite galaxies

被引：27

作者：

Bernstein, GM ^{[1
]}

Norberg, P

机构：

[1] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA

[2] Univ Durham, Dept Phys, Durham DH1 3LE, England

来源：

ASTRONOMICAL JOURNAL | 2002年 / 124卷 / 02期

基金：

美国国家科学基金会;

关键词：

galaxies : dwarf; galaxies : halos; gravitational lensing;

D O I：

10.1086/341383

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We test a sample of satellites of isolated primary galaxies, extracted from the 2dF Galaxy Redshift Survey, for any tendency to be aligned along (or against) the primary-to-satellite radius vector. If tidal effects induce such an alignment, it would contaminate recent measurements of galaxy halo masses that use the coherent alignment induced on background galaxies by gravitational lensing. The mean tangential ellipticity of 1819 satellites within 500 kpc projected radius is (e(+)) = +0.004 +/- 0.008, so no tidal alignment is detected. This implies at 95% confidence that satellite alignment is less than a 20% contamination of the alignment signal recently attributed to galaxy-galaxy lensing by Smith et al. and McKay et al.

引用

页码：733 / 736

页数：4

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