Publication Date

6-1-2024

Document Type

Article

Publication Title

Monthly Notices of the Royal Astronomical Society

Volume

531

Issue

1

DOI

10.1093/mnras/stae1287

First Page

1856

Last Page

1869

Abstract

In order to facilitate the future study of ultra-diffuse galaxies (UDGs), we compile a catalogue of their spectroscopic properties. Using it, we investigate some of the biases inherent in the current UDG sample that have been targeted for spectroscopy. In comparison to a larger sample of UDGs studied via their spectral energy distributions (SED), current spectroscopic targets are intrinsically brighter, have higher stellar mass, are larger, more globular cluster-rich, older, and have a wider spread in their metallicities. In particular, many spectroscopically studied UDGs have a significant fraction of their stellar mass contained within their globular cluster (GC) system. We also search for correlations between parameters in the catalogue. Of note is a correlation between alpha element abundance and metallicity, as may be expected for a 'failed galaxy' scenario. However, the expected correlations of metallicity with age are not found, and it is unclear if this is evidence against a 'failed galaxy' scenario or simply due to the low number of statistics and the presence of outliers. Finally, we attempt to segment our catalogue into different classes using a machine learning K-means method. We find that the clustering is very weak and that it is currently not warranted to split the catalogue into multiple, distinct subpopulations. Our catalogue is available online, and we aim to maintain it beyond the publication of this work.

Funding Sponsor

Instituto de Astrofísica de Canarias

Keywords

catalogues, galaxies: dwarf, galaxies: formation, galaxies: fundamental parameters, galaxies: kinematics and dynamics

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.

Department

Physics and Astronomy

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