Multi-component parametric inversion of galaxy kinematics and stellar populations using full spectral fitting

TL;DR

This paper introduces a new two-component spectral fitting method for galaxy kinematics and stellar populations, accounting for differences between disc and bulge components, and demonstrates its effectiveness through Monte-Carlo simulations.

Contribution

It presents a novel multi-component parametric inversion technique that models stellar kinematics and populations simultaneously, addressing limitations of previous methods.

Findings

Demonstrates degeneracies between parameters via Monte-Carlo simulations

Provides a framework for analyzing asymmetric LOSVDs in galaxy regions

Enhances understanding of galaxy structure through spectral decomposition

Abstract

The stellar line-of-sight velocity distribution (LOSVD) can be strongly asymmetric in regions where the light contributions of both disc and bulge in spiral and lenticular galaxies are comparable. Existing techniques for the stellar kinematics analysis do not take into account the difference of disc and bulge stellar populations. Here we present a novel approach to the analysis of stellar kinematics and stellar populations. We use a two-component model of spectra where different stellar population components are convolved with pure Gaussian LOSVDs. For this model we present Monte-Carlo simulations demonstrating degeneracies between the parameters.