期刊
ASTRONOMICAL JOURNAL
卷 141, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/141/1/27
关键词
galaxies: elliptical and lenticular, cD; galaxies: individual (NGC 5128); galaxies: interactions; galaxies: star clusters: general; globular clusters: general; planetary nebulae: general
资金
- NSERC
We use recently compiled position and velocity data for the globular cluster and planetary nebula subsystems in GC 5128, the nearby giant elliptical, to search for evidence of past dwarf-satellite accretion events. Beyond a 10' (similar to 11 kpc) radius in galactocentric distance, we find tentative evidence for four subgroups of globular clusters and four subgroups of planetary nebulae. These each have more than four members within a search radius of 2' and internal velocity dispersion of less than or similar to 40 km s(-1), typical parameters for a dwarf galaxy. In addition, two of the globular cluster groupings overlap with two of the planetary nebulae groupings, and two subgroupings also appear to overlap with previously known arc and shell features in the halo light. Simulation tests of our procedure indicate that the probability of finding false groups due to chance is <1%.
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