2012MNRAS.426.1137S

Query : 2012MNRAS.426.1137S

2012MNRAS.426.1137S - Mon. Not. R. Astron. Soc., 426, 1137-1143 (2012/October-3)

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

SOLLIMA A., GRATTON R.G., CARBALLO-BELLO J.A., MARTINEZ-DELGADO D., CARRETTA E., BRAGAGLIA A., LUCATELLO S. and PENARRUBIA J.

Abstract (from CDS):

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 33arcmin 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 (σv ≤ 20km/s) peak in the distribution of velocities at vr ∼ 180km/s constituted mainly by main-sequence stars whose location in the colour-magnitude 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.

Based on VIsible MultiObject Spectrograph (VIMOS) observations collected with the Very Large Telescope at the European Southern Observatory, Cerro Paranal, Chile, within the observing programme 082.D-0244.

Alexander von Humboldt Fellow for Advanced Research.


Abstract Copyright: © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS

Journal keyword(s): methods: data analysis - methods: observational - techniques: radial velocities - globular clusters: individual: NGC 1851 - Galaxy: halo - Galaxy: stellar content

VizieR on-line data: <Available at CDS (J/MNRAS/426/1137): table1.dat>

Nomenclature: Table 1: [SGC2012] NNN N=107 among (Nos 9-730).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
3 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 883 0
4 NGC 2298 GlC 06 48 59.41 -36 00 19.1     8.89     ~ 547 0
5 NAME CMa Dwarf Galaxy G 07 12.6 -27 40     -0.1     ~ 203 1
6 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
7 NGC 4147 GlC 12 10 06.149 +18 32 31.78   11.45 10.74     ~ 616 0
8 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
9 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
10 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 548 0
11 NAME Monoceros Stream St* ~ ~           ~ 374 1

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