Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2011-06-09
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
Accepted for publication in MNRAS; 20 pages, 18 figures and 3 tables
Scientific paper
Tidal streams provide a powerful tool by means of which the matter distribution of the dark matter halos 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 fit 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.
Ibata Rodrigo A.
Lewis Geraint F.
Varghese Anjali
No associations
LandOfFree
Stellar Streams as Probes of Dark Halo Mass and Morphology: A Bayesian Reconstruction does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Stellar Streams as Probes of Dark Halo Mass and Morphology: A Bayesian Reconstruction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stellar Streams as Probes of Dark Halo Mass and Morphology: A Bayesian Reconstruction will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-580145