孤立椭圆Galerkin的同伴：重访Bothun-Sullivan样本
Companions to Isolated Elliptical Galaxies: Revisiting the Bothun-Sullivan Sample
摘要：
我们研究了一个相对孤立的椭圆星系样本的物理伴星系的数量。NED已被用于重新研究34个椭圆星系样本的卫星星系的入射，首先由Bothun & Sullivan在视觉搜索中进行了研究，预计搜索半径为75 kpc。我们使用NED中编目的数据重复了他们最初的调查。这些椭圆星系中有9个似乎是星系团的成员;剩下的25个星系样本显示，在75 kpc的预测搜索半径内，每个星系平均有+1.0+/-0.5个明显的伴星，超过了两个等面积的比较区域，距离为150-300 kpc。这比Bothun & Sullivan在相同样本中发现的+0.12+/-0.42个伴星/星系要大得多。利用已发表的径向速度来识别物理伴星，并给出了每个椭圆星系+0.4伴星的较低估计。搜索半径扩大到300千码差距。
英文摘要：
(Abridged) We investigate the number of physical companion galaxies for a sample of relatively isolated elliptical galaxies. NED has been used to reinvestigate the incidence of satellite galaxies for a sample of 34 elliptical galaxies, first investigated by Bothun & Sullivan in a visual search out to a projected search radius of 75 kpc. We have repeated their original investigation using data cataloged in NED. Nine of these elliptical galaxies appear to be members of galaxy clusters; the remaining sample of 25 galaxies reveals an average of +1.0+/-0.5 apparent companions per galaxy within a projected search radius of 75 kpc, in excess of two equal-area comparison regions displaced by 150-300 kpc. This is significantly larger than the +0.12+/-0.42 companions/galaxy found by Bothun & Sullivan for the identical sample. Making use of published radial velocities identifies physical companions and gives a somewhat lower estimate of +0.4 companions per elliptical galaxy. An expansion of the search radius out to 300 kpc.
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