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| DOI | 10.1093/MNRAS/STU1797 | ||||
| Año | 2015 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
Hercules is a dwarf spheroidal satellite of the Milky Way, found at a distance of approximate to 138 kpc, and showing evidence of tidal disruption. It is very elongated and exhibits a velocity gradient of 16 +/- 3 km s(-1) kpc(-1). Using these data a possible orbit of Hercules has previously been deduced in the literature. In this study, we make use of a novel approach to find a best-fitting model that follows the published orbit. Instead of using trial and error, we use a systematic approach in order to find a model that fits multiple observables simultaneously. As such, we investigate a much wider parameter range of initial conditions and ensure we have found the best match possible. Using a dark matter free progenitor that undergoes tidal disruption, our best-fitting model can simultaneously match the observed luminosity, central surface brightness, effective radius, velocity dispersion, and velocity gradient of Hercules. However, we find it is impossible to reproduce the observed elongation and the position angle of Hercules at the same time in our models. This failure persists even when we vary the duration of the simulation significantly, and consider a more cuspy density distribution for the progenitor. We discuss how this suggests that the published orbit of Hercules is very likely to be incorrect.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | BLANA, MATIAS | Hombre |
Universidad de Concepción - Chile
Max Planck Institute for Extraterrestrial Physics - Alemania |
| 2 | Fellhauer, Michael | Hombre |
Centro de Excelencia en Astrofísica y Tecnologías Afines - Chile
Universidad de Concepción - Chile Max Planck Institute for Extraterrestrial Physics - Alemania |
| 3 | Smith, Rory | Hombre |
Universidad de Concepción - Chile
Max Planck Institute for Extraterrestrial Physics - Alemania |
| 4 | CANDLISH, GRAEME NICHOLAS | Hombre |
Universidad de Concepción - Chile
Max Planck Institute for Extraterrestrial Physics - Alemania |
| 5 | Cohen, Roger E. | Hombre |
Universidad de Concepción - Chile
Max Planck Institute for Extraterrestrial Physics - Alemania |
| 6 | Farias, J. P. | - |
Universidad de Concepción - Chile
Max Planck Institute for Extraterrestrial Physics - Alemania |
| Agradecimiento |
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| MF acknowledges financial support of FONDECYT grant no. 1095092, 1130521 and BASAL PFB-06/2007. RS acknowledges financial support of FONDECYT grant no. 3120135. GNC acknowledges financial support of FONDECYT grant no. 3130480. RC acknowledges financial support through an ESO Comite Mixto grant. |