Spectral Libraries for Analyzing Spectra of Low-Metalicity Galaxies

TL;DR

This paper introduces new spectral libraries tailored for analyzing low-metallicity star clusters and starburst galaxies, incorporating non-LTE spectra and rotation effects, along with a Python tool for spectral integration.

Contribution

The authors developed isochrone-specific spectral libraries with non-LTE spectra at various metallicities, including rotation, and provided a Python program for spectral synthesis based on initial mass functions.

Findings

Spectral libraries cover metallicities Z=0.006, 0.002, 0.0004.

Includes spectra with and without stellar rotation effects.

Provides a Python tool for spectral integration using initial mass functions.

Abstract

We present a set of isochrone-tailored spectral libraries for analyzing composite spectra of low-metallicity massive star clusters or starburst galaxies. Specifically, we have computed non-LTE spectra for stars of all initial masses for isochrones at metallicities, Z=0.006, 0.002,and 0.0004, with and without considering rotation. These isochrones were constructed by the Geneva group (Ekstr\"{o}m et al., 2011; Georgy et al., 2013; Groh et al., 2019; Eggenberger et al. 2020). We also present a Python program for integrating individual spectra for an arbitrary initial mass function.