AustralieFrV1, PascalFrancis, Checkpoint, bibRecord, 001659

Stellar streams as probes of dark halo mass and morphology: a Bayesian reconstruction

Identifieur interne : 001659 ( PascalFrancis/Checkpoint ); précédent : 001658; suivant : 001660

Stellar streams as probes of dark halo mass and morphology: a Bayesian reconstruction

Auteurs : A. Varghese [France] ; R. Ibata [France] ; G. F. Lewis [Australie]

Source :

Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2011.

RBID : Pascal:11-0435890

Descripteurs français

Pascal (Inist)
- Morphologie, Matière sombre, Galaxies, Orbite, Cinématique, Correction, Densité potentielle, Distribution densité, Masse stellaire, Gravitation.

English descriptors

KwdEn :
- Corrections, Dark matter, Density distribution, Galaxies, Gravitation, Kinematics, Morphology, Orbits, Potential density, Stellar mass.

Abstract

Tidal streams provide a powerful tool by means of which the matter distribution of the dark matter haloes of their host galaxies can be studied. However, the analysis is not straightforward because streams do not delineate orbits, and for most streams, especially those in external galaxies, kinematic information is absent. We present a method wherein streams are fitted with simple corrections made to possible orbits of the progenitor, using a Bayesian technique known as parallel tempering to efficiently explore the parameter space. We show that it is possible to constrain the shape of the host halo potential or its density distribution using only the projection of tidal streams on the sky, if the host halo is considered to be axisymmetric. By adding kinematic data or the circular velocity curve of the host to the fitting data, we are able to recover other parameters of the matter distribution such as its mass and profile. We test our method on several simulated low-mass stellar streams and also explore the cases for which additional data are required.

Affiliations:

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Le document en format XML

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Stellar streams as probes of dark halo mass and morphology: a Bayesian reconstruction

Stellar streams as probes of dark halo mass and morphology: a Bayesian reconstruction

Source :

Descripteurs français

English descriptors

Abstract

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

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri