Constraining the vertical structure of the Milky Way rotation by microlensing in a finite-width global disk model^⋆

¹ Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskego 152, 31342 Kraków, Poland
e-mail: Lukasz.Bratek@ifj.edu.pl
² Astronomical Observatory, Jagellonian University, Orla 171, 30244 Kraków, Poland
³ Institute of Physics, Jagellonian University, Reymonta 4, 30059 Kraków, Poland

Received: 26 October 2013
Accepted: 24 April 2014

Abstract

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.