Modeling the Kinematics of Distant Galaxies

TL;DR

This paper develops a detailed kinematic model of distant galaxies incorporating stellar, gaseous, and dark matter components to better understand their evolution, using Hubble data and hydrodynamical simulations.

Contribution

It introduces a comprehensive three-dimensional galaxy model including gas and dark matter, and applies it to analyze galaxy kinematics from Hubble observations.

Findings

Both galaxies studied are disk-dominated.

The model estimates gas and stellar mass ratios in the disks.

Kinematic profiles match observational data.

Abstract

Evolution of galaxies is one of the most actual topics in astrophysics. Among the most important factors determining the evolution are two galactic components which are difficult or even impossible to detect optically: the gaseous disks and the dark matter halo. We use deep Hubble Space Telescope images to construct a two-component (bulge + disk) model for stellar matter distribution of galaxies. Properties of the galactic components are derived using a three-dimensional galaxy modeling software, which also estimates disk thickness and inclination angle. We add a gas disk and a dark matter halo and use hydrodynamical equations to calculate gas rotation and dispersion profiles in the resultant gravitational potential. We compare the kinematic profiles with the Team Keck Redshift Survey observations. In this pilot study, two galaxies are analyzed deriving parameters for their stellar components; both galaxies are found to be disk-dominated. Using the kinematical model, the gas mass and stellar mass ratio in the disk are estimated.