The elliptical galaxy NGC 5044: Stellar population and ionized gas
M. G. Rickes, M.G. Pastoriza, Ch Bonatto
TL;DR
This study analyzes the stellar populations, metallicity, and ionized gas in NGC 5044 using spectroscopy, revealing alpha element enhancement, multiple ionization sources, and spatial variations in gas properties.
Contribution
It provides a detailed spectroscopic analysis of NGC 5044, highlighting the presence of multiple ionization mechanisms and metallicity gradients in an elliptical galaxy.
Findings
Alpha element enhancement towards the galaxy center
Evidence of non-thermal ionization sources like AGN or shocks
External regions show ionization from hot post-AGB stars
Abstract
In this work we investigate the stellar population, metallicity distribution and ionized gas in the elliptical galaxy NGC 5044, using long-slit spectroscopy and a stellar population synthesis method. We found differences in the slope of metal-line profiles along the galaxy which suggests an enhancement of alpha elements, particularly towards the central region. The presence of a non-thermal ionization source, such as a low-luminosity AGN and/or shock ionization, is implied by the large values of the ratio (N II])Ha observed in all sampled regions. However, the emission lines observed in the external regions indicate the presence of an additional ionization source, probably hot, post-AGB stars.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.