Gravitational microlensing as a test of a finite-width disk model of the Galaxy

TL;DR

This paper demonstrates that a finite-width disk model of the Galaxy aligns with microlensing and rotational data, implying minimal non-baryonic dark matter in the inner Galaxy region.

Contribution

It introduces a simple finite-width disk model showing consistency between microlensing mass and dynamical mass, challenging the need for significant non-baryonic dark matter.

Findings

Microlensing mass matches dynamical mass after gas subtraction.

Non-baryonic mass component appears negligible in the inner Galaxy.

Supports a baryon-dominated model of the Galaxy.

Abstract

The aim of this work is to show, in the framework of a simple finite-width disk model, that the amount of mass seen through gravitational microlensing measurements in the region $0<R<R0$ is consistent with the dynamical mass ascertained from Galaxy rotation after subtracting gas contribution. Since microlensing only detects compact objects, this result suggests that a non-baryonic mass component may be negligible in this region.