The sagittarius stream and halo triaxiality

  • Deg N
  • Widrow L
  • 20


    Mendeley users who have this article in their library.
  • 35


    Citations of this article.


We present a mass model for the Milky Way, which is fitted to observations of the Sagittarius stream together with constraints derived from a wide range of photometric and kinematic data. The model comprises a Sérsic bulge, an exponential disc and an Einasto halo. Our Bayesian analysis is accomplished using an affine-invariant Markov chain Monte Carlo algorithm. We find that the best-fitting dark matter halo is triaxial with axis ratios of 3.3 ± 0.7 and 2.7 ± 0.4 and with the short axis approximately aligned with the Sun–Galactic Centre line. Our results are consistent with those presented in Law & Majewski. Such a strongly aspherical halo is disfavoured by the standard cold dark matter scenario for structure formation.

Author-supplied keywords

  • Dynamics-Galaxy
  • Galaxy
  • Halo-Galaxy
  • Structure
  • kinematics

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Get full text


  • Nathan Deg

  • Lawrence Widrow

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free