The globular cluster NGC 7492 and the Sagittarius tidal stream: together but unmixed
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Carballo Bello, J. A
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The globular cluster NGC 7492 and the Sagittarius tidal stream: together but unmixed
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Abstract
We have derived from VIMOS spectroscopy the radial velocities for a sample of 71 stars selected from CFHT/Megacam photometry around the Galactic globular cluster NGC 7492. In the resulting velocity distribution, it is possible to distinguish two relevant non-Galactic kinematic components along the same line of sight: a group of stars at < v(r)> similar to 125 km s(-1) which is compatible with the velocity of the old leading arm of the Sagittarius tidal stream, and a larger number of objects at < v(r)> similar to -110 km s(-1) that might be identified as members of the trailing wrap of the same stream. The systemic velocity of NGC 7492 set at v(r) similar to -177 km s(-1) differs significantly from that of both components, thus our results confirm that this cluster is not one of the globular clusters deposited by the Sagittarius dwarf spheroidal in the Galactic halo, even if it is immersed in the stream. A group of stars with < v(r)> similar to -180 km s(-1) might be comprised of cluster members along one of the tidal tails of NGC 7492.
Patrocinador
CONICYT-Chile FONDECYT Postdoctoral Fellowship
3160502
Ministry for the Economy, Development, and Tourism's Programa Iniciativa Cientifica Milenio
IC120009
CONICYT's PCI program
DPI20140066
Proyecto Basal
PFB-06/2007
FONDECYT
1171273
1170364
CONICYT-PCHA
2015-21151643
German Research Foundation (DFG)
Sonderforschungsbereich SFB 881
CONICYT
ACT-1122
project BASAL
PFB-06
Comite Mixto ESO-GOBIERNO DE CHILE
CONICYT, Programa de astronomia, Fondo GEMINI, posicion Postdoctoral
ESO programme
091.D-0446(D)
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Artículo de publicación ISI
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Monthly Notices of The Royal Astronomical Society 474, 4766–4771 (2018)
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