期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 426, 期 2, 页码 1137-1143出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2012.21803.x
关键词
methods: data analysis; methods: observational; techniques: radial velocities; globular clusters: individual: NGC 1851; Galaxy: halo; Galaxy: stellar content
资金
- INAF
- Ramon y Cajal Programme
- Ministerio of Economia y Competitividad [AYA2010-17631]
We present the results of a spectroscopic survey performed in the outskirts of the globular cluster NGC 1851 with VIsible MultiObject Spectrograph (VIMOS)/Very Large Telescope (VLT). The radial velocities of 107 stars in a region between 12 and 33?arcmin around the cluster have been derived. We clearly identify the cluster stellar population over the entire field of view, indicating the presence of a significant fraction of stars outside the tidal radius predicted by King models. We also find tentative evidence of a cold (sv = 20?km?s-1) peak in the distribution of velocities at vr similar to 180?km?s-1 constituted mainly by main-sequence stars whose location in the colourmagnitude diagram is compatible with a stream at a similar distance to this cluster. If confirmed, this evidence would strongly support the extragalactic origin of this feature.
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