A Catalogue and Analysis of Ultra-Diffuse Galaxy Spectroscopic Properties
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arXiv
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| Format: | Preprint |
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2024
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| author | Gannon, Jonah S. Ferré-Mateu, Anna Forbes, Duncan A. Brodie, Jean P. Buzzo, Maria Luisa Romanowsky, Aaron J. |
| author_facet | Gannon, Jonah S. Ferré-Mateu, Anna Forbes, Duncan A. Brodie, Jean P. Buzzo, Maria Luisa Romanowsky, Aaron J. |
| contents | In order to help 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 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 sub-populations. Our catalogue is available online and we aim to maintain it beyond the publication of this work. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_09104 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A Catalogue and Analysis of Ultra-Diffuse Galaxy Spectroscopic Properties Gannon, Jonah S. Ferré-Mateu, Anna Forbes, Duncan A. Brodie, Jean P. Buzzo, Maria Luisa Romanowsky, Aaron J. Astrophysics of Galaxies In order to help 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 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 sub-populations. Our catalogue is available online and we aim to maintain it beyond the publication of this work. |
| title | A Catalogue and Analysis of Ultra-Diffuse Galaxy Spectroscopic Properties |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2405.09104 |