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| DOI | 10.1093/MNRAS/STU2303 | ||||
| Año | 2015 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
We present a study of the kinematics of the remote globular cluster NGC 5694 based on GIRAFFE@VLT medium-resolution spectra. A sample of 165 individual stars selected to lie on the red giant branch in the cluster colour-magnitude diagram was considered. Using radial velocity and metallicity from Calcium triplet, we were able to select 83 bona fide cluster members. The addition of six previously known members leads to a total sample of 89 cluster giants with typical uncertainties <= 1.0 kms(-1) in their radial velocity estimates. The sample covers a wide range of projected distances from the cluster centre, from similar to 0.2 arcmin to 6.5 arcmin similar or equal to 23 half-light radii (r(h)). We find only very weak rotation, as typical of metal-poor globular clusters. The velocity dispersion gently declines from a central value of sigma = 6.1 kms(-1) to sigma similar or equal to 2.5 kms(-1) at similar to 2 arcmin similar or equal to 7.1r(h), then it remains flat out to the next (and last) measured point of the dispersion profile, at similar to 4 arcmin similar or equal to 14.0r(h), at odds with the predictions of isotropic King models. We show that both isotropic single-mass non-collisional models and multimass anisotropic models can reproduce the observed surface brightness and velocity dispersion profiles.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Bellazzini, M. | Mujer |
Istituto Nazionale di Astrofisica - Italia
Osservatorio Astronomico Di Bologna - Italia |
| 2 | Mucciarelli, A. | Hombre |
UNIV BOLOGNA - Italia
Alma Mater Studiorum Università di Bologna - Italia |
| 3 | Sollima, Antonio | Hombre |
Istituto Nazionale di Astrofisica - Italia
Osservatorio Astronomico Di Bologna - Italia |
| 4 | Catelan, Marcio | Hombre |
Pontificia Universidad Católica de Chile - Chile
Instituto Milenio de Astrofísica - Chile Centro de Excelencia en Astrofísica y Tecnologías Afines - Chile |
| 5 | Dalessandro, E. | Hombre |
UNIV BOLOGNA - Italia
Alma Mater Studiorum Università di Bologna - Italia |
| 6 | Correnti, M. | Hombre |
Space Telescope Sci Inst - Estados Unidos
STScI - Estados Unidos Space Telescope Science Institute - Estados Unidos |
| 7 | D'Orazi, Valentina | Mujer |
Macquarie Univ - Australia
MONASH UNIV - Australia Macquarie University - Australia Monash University - Australia |
| 8 | CORTES-ORELLANA, CADDY CORAL | Hombre |
Instituto Milenio de Astrofísica - Chile
Universidad Metropolitana de Ciencias de la Educación - Chile |
| 9 | AMIGO-FUENTES, PIA CONSUELO | Mujer |
Instituto Milenio de Astrofísica - Chile
Universidad de Valparaíso - Chile |
| Fuente |
|---|
| FONDECYT |
| National Science Foundation |
| Proyecto Basal |
| Fondo Nacional de Desarrollo Científico, Tecnológico y de Innovación Tecnológica |
| Ministry for the Economy, Development, and Tourism's Programa Iniciativa Cientifica Milenio |
| Fondo Nacional de Desarrollo CientÃfico, Tecnológico y de Innovación Tecnológica |
| Ministry for the Economy, Development |
| PRIN MIUR |
| Agradecimiento |
|---|
| We are grateful to an anonymous referee for useful comments and suggestions. MB and AS acknowledges the financial support from PRIN MIUR, project: The Chemical and Dynamical Evolution of the Milky Way and Local Group Galaxies, prot. 2010LY5N2T, (PI F. Matteucci). Support for MC, PA and CC is provided by the Ministry for the Economy, Development, and Tourism's Programa Iniciativa Cientifica Milenio through grant IC 120009, awarded to the Millennium Institute of Astrophysics (MAS). MC also acknowledges support by Proyecto Basal PFB-06/2007 and by FONDECYT grant #1141141. |
| 2 IRAF (Image Reduction and Analysis Facility) is distributed by the National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation. 3 http://wwwuser.oat.ts.astro.it/castelli/odfnew.html |