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Spectroscopic hint of a cold stream in the direction of the globular cluster NGC 1851

We present the results of a spectroscopic survey performed in the outskirts of the globular cluster NGC1851 with VIMOS@VLT. The radial velocities of 107 stars in a region between 12' and 33' 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 (sigma_v< 20 km/s) peak in the distribution of velocities at v_r~180 km/s constituted mainly by Main Sequence stars whose location in the color-magnitude diagram is compatible with a stream at a similar distance of this cluster. If confirmed, this evidence would strongly support the extra-Galactic origin of this feature.

preprint2012arXivOpen access
A. SollimaR. G. GrattonJ. A. Carballo-BelloD. Martinez-DelgadoE. CarrettaA. BragagliaS. LucatelloJ. Penarrubia
astro-ph.GA
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A. SollimaR. G. GrattonJ. A. Carballo-BelloD. Martinez-DelgadoE. CarrettaA. BragagliaS. LucatelloJ. Penarrubia

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