AustralieFrV1, Main, Exploration, bibRecord, 009143

Inside the whale: the structure and dynamics of the isolated Cetus dwarf spheroidal

Identifieur interne : 009143 ( Main/Exploration ); précédent : 009142; suivant : 009144

Inside the whale: the structure and dynamics of the isolated Cetus dwarf spheroidal

Auteurs : G. F. Lewis [Australie] ; R. A. Ibata [France] ; S. C. Chapman [États-Unis] ; A. Mcconnachie [Canada] ; M. J. Irwin ; E. Tolstoy [Pays-Bas] ; N. R. Tanvir

Source :

Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2007-03-11.

RBID : ISTEX:80D5653725A378192CDACCD1B420928421C86262

Descripteurs français

Pascal (Inist)
- Cinématique, Deimos, Dispersion vitesse, Dynamique, Filtre adapté, Galaxies naines, Groupe local, Observation spectroscopique, Orbite, Rapport masse luminosité, Satellite Mars, Vitesse rotation, Voie lactée.

English descriptors

Abstract

This paper presents a study of the Cetus dwarf, an isolated dwarf galaxy within the Local Group. A matched‐filter analysis of the INT/WFC imaging of this system reveals no evidence for significant tidal debris that could have been torn off the galaxy, bolstering the hypothesis that Cetus has never significantly interacted with either the Milky Way or M31. Additionally, Keck/Deimos spectroscopic observations identify this galaxy as a distinct kinematic population possessing a systematic velocity of −87 ± 2 km s−1 and with a velocity dispersion of 17 ± 2 km s−1; while tentative, these data also suggest that Cetus possesses a moderate rotational velocity of ∼8 km s−1. The population is confirmed to be relatively metal‐poor, consistent with [Fe/H]∼−1.9, and, assuming virial equilibrium, implies that the Cetus dwarf galaxy possesses a mass‐to‐light ratio of ∼70. It appears, therefore, that Cetus may represent a primordial dwarf galaxy, retaining the kinematic and structural properties lost by other members of the dwarf population of the Local Group in their interactions with the large galaxies. An analysis of Cetus' orbit through the Local Group indicates that it is at apocentre; taken in conjunction with the general dwarf population, this shows the mass of the Local Group to be ≳2 × 1012 M⊙.

Url:

DOI: 10.1111/j.1365-2966.2007.11395.x

Affiliations:

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<front><div type="abstract" xml:lang="en">This paper presents a study of the Cetus dwarf, an isolated dwarf galaxy within the Local Group. A matched‐filter analysis of the INT/WFC imaging of this system reveals no evidence for significant tidal debris that could have been torn off the galaxy, bolstering the hypothesis that Cetus has never significantly interacted with either the Milky Way or M31. Additionally, Keck/Deimos spectroscopic observations identify this galaxy as a distinct kinematic population possessing a systematic velocity of −87 ± 2 km s−1 and with a velocity dispersion of 17 ± 2 km s−1; while tentative, these data also suggest that Cetus possesses a moderate rotational velocity of ∼8 km s−1. The population is confirmed to be relatively metal‐poor, consistent with [Fe/H]∼−1.9, and, assuming virial equilibrium, implies that the Cetus dwarf galaxy possesses a mass‐to‐light ratio of ∼70. It appears, therefore, that Cetus may represent a primordial dwarf galaxy, retaining the kinematic and structural properties lost by other members of the dwarf population of the Local Group in their interactions with the large galaxies. An analysis of Cetus' orbit through the Local Group indicates that it is at apocentre; taken in conjunction with the general dwarf population, this shows the mass of the Local Group to be ≳2 × 1012 M⊙.</div>
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Serveur d'exploration sur les relations entre la France et l'Australie

Inside the whale: the structure and dynamics of the isolated Cetus dwarf spheroidal

Inside the whale: the structure and dynamics of the isolated Cetus dwarf spheroidal

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

	Serveur d'exploration sur les relations entre la France et l'Australie
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