2014/04/24 by Joanna Jałocha, Szymon Sikora, Łukasz Bratek +1
Physics and Astronomy · #Astronomy and Astrophysical Research #Dark matter #Differential rotation #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy rotation curve #Gravitational microlensing #Mass distribution #Milky Way #Orbit (dynamics) #Rotation (mathematics) #Stellar, planetary, and galactic studies #astro-ph.GA
paper · pdf · doi:10.1051/0004-6361/201322919
published as A&A 566, A87 (2014) · 10 pages, 10 figures
arxiv created 2014/04/24 · openalex publication_date 2014/05/07 · arxiv updated 2014/06/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We model the vertical structure of mass distribution of the Milky Way galaxy in the framework of a finite-width global disk model. Assuming only the Galactic rotation curve, we tested the predictions of the model inside the solar orbit for two measurable processes that are unrelated to each other: the gravitational microlensing that allows one to fix the disk width-scale by the best fit to measurements, and the vertical gradient of rotation modeled in the quasi-circular orbits approximation. The former is sensitive to the gravitating mass in compact objects, the latter to all kinds of gravitating matter. The analysis points to a small width-scale of the considered disks and an at-most insignificant contribution of non-baryonic dark matter in the solar circle. The predicted high vertical gradient values in the rotation are consistent with the gradient measurements.