Simple dynamical models of the Sagittarius dwarf galaxy

We present two simple dynamical models for Sagittarius based on N-body simulations of the progressive disruption of a satellite galaxy orbiting for 12.5 Gyr within a realistic Galactic potential. In both models the satellite initially has observable properties similar to those of current outlying dw...

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Detalles Bibliográficos
Autores principales: Helmi, Amina, White, Simon David Manton
Formato: Articulo
Lenguaje:Inglés
Publicado: 2001
Materias:
Ciencias Astronómicas
Galaxies: individual: Sagittarius dSph
Galaxies: interactions
Galaxy: halo
Galaxy: structure
Local group
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83148
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83148
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Galaxies: individual: Sagittarius dSph
Galaxies: interactions
Galaxy: halo
Galaxy: structure
Local group
spellingShingle Ciencias Astronómicas
Galaxies: individual: Sagittarius dSph
Galaxies: interactions
Galaxy: halo
Galaxy: structure
Local group
Helmi, Amina
White, Simon David Manton
Simple dynamical models of the Sagittarius dwarf galaxy
topic_facet Ciencias Astronómicas
Galaxies: individual: Sagittarius dSph
Galaxies: interactions
Galaxy: halo
Galaxy: structure
Local group
description We present two simple dynamical models for Sagittarius based on N-body simulations of the progressive disruption of a satellite galaxy orbiting for 12.5 Gyr within a realistic Galactic potential. In both models the satellite initially has observable properties similar to those of current outlying dwarfs; in one case it is purely stellar while in the other it is embedded in an extended massive halo. The purely stellar progenitor is a King model with a total velocity dispersion of 18.9 km s<SUP>-1</SUP>, a core radius of 0.44 kpc and a tidal radius of 3 kpc. The initial stellar distribution in the other case follows a King profile with the same core radius, a slightly larger total velocity dispersion and similar extent. Both these models are consistent with all published data on the current Sagittarius system, they match not only the observed properties of the main body of Sagittarius, but also those reported for unbound debris at larger distances.
format Articulo
Articulo
author Helmi, Amina
White, Simon David Manton
author_facet Helmi, Amina
White, Simon David Manton
author_sort Helmi, Amina
title Simple dynamical models of the Sagittarius dwarf galaxy
title_short Simple dynamical models of the Sagittarius dwarf galaxy
title_full Simple dynamical models of the Sagittarius dwarf galaxy
title_fullStr Simple dynamical models of the Sagittarius dwarf galaxy
title_full_unstemmed Simple dynamical models of the Sagittarius dwarf galaxy
title_sort simple dynamical models of the sagittarius dwarf galaxy
publishDate 2001
url http://sedici.unlp.edu.ar/handle/10915/83148
work_keys_str_mv AT helmiamina simpledynamicalmodelsofthesagittariusdwarfgalaxy
AT whitesimondavidmanton simpledynamicalmodelsofthesagittariusdwarfgalaxy
bdutipo_str Repositorios
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