Details

Autor(en) / Beteiligte

• Bovy, Jo
• Rix, Hans-Walter

Titel

A DIRECT DYNAMICAL MEASUREMENT OF THE MILKY WAY'S DISK SURFACE DENSITY PROFILE, DISK SCALE LENGTH, AND DARK MATTER PROFILE AT 4 kpc ≲ R ≲ 9 kpc

Ist Teil von

• The Astrophysical journal, 2013-12, Vol.779 (2), p.1-30

Ort / Verlag

United States

Erscheinungsjahr

2013

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• We present and apply rigorous dynamical modeling with which we infer unprecedented constraints on the stellar and dark matter mass distribution within our Milky Way (MW), based on large sets of phase-space data on individual stars. We independently fit a parameterized MW potential and a three-integral, action-based distribution function (DF) to the phase-space data of 43 separate abundance-selected sub-populations (MAPs), accounting for the complex selection effects affecting the data. Using metal-poor MAPs with small radial scale lengths as dynamical tracers probes 4.5 kpc [lap] RGC [lap] 7 kpc, while MAPs with longer radial scale lengths sample 7 kpc [lap] RGC [lap] 9 kpc. Our results show that action-based DF modeling of complex stellar data sets is now a feasible approach that will be fruitful for interpreting Gaia data.