On the axisymmetric thin disk model of flattened galaxies

TL;DR

This paper investigates the gravitational effects and rotation curve features of flattened galaxies using an axisymmetric thin disk model, highlighting the impact of data cutoff and demonstrating the model's effectiveness with NGC 5475.

Contribution

It introduces an iteration method to analyze thin disk models and shows that baryonic matter distribution can explain observed rotation curves in spiral galaxies.

Findings

Non-monotonic rotation curve features are characteristic of thin disk models.

Data cutoff significantly affects mass distribution estimates.

Baryonic matter distribution explains NGC 5475's rotation curve.

Abstract

Non-monotonic features of rotation curves, and also the related gravitational effects typical of thin disks -- like backward-reaction or amplification of rotation by negative surface density gradients -- which are characteristic imprints of disk-like mass distributions, are discussed in the axisymmetric thin disk model. The influence of the data cutoff in rotational velocity measurements on the determination of the mass distribution in flattened galaxies is studied. It has also been found that the baryonic matter distribution in the spiral galaxy NGC 5475, obtained in the axisymmetric thin disk approximation, accounts for the rotation curve of the galaxy. To obtain these results, the iteration method developed recently by the authors has been applied.