The Disturbed and Globular Cluster-Rich Ultra-diffuse Galaxy UGC 9050-Dw1
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arXiv
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| Auteurs principaux: | , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866914629055152128 |
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| author | Fielder, Catherine E. Jones, Michael G. Sand, David J. Bennet, Paul Crnojevic, Denija Karunakaran, Ananthan Mutlu-Pakdil, Burcin Spekkens, Kristine |
| author_facet | Fielder, Catherine E. Jones, Michael G. Sand, David J. Bennet, Paul Crnojevic, Denija Karunakaran, Ananthan Mutlu-Pakdil, Burcin Spekkens, Kristine |
| contents | We investigate the ultra-diffuse galaxy (UDG) UGC 9050-Dw1, which was selected because of its disturbed morphology as part of a larger sample of UDGs that display evidence for significant interactions. We use the Hubble Space Telescope's Advanced Camera for Surveys to identify globular clusters (GCs) associated with UGC 9050-Dw1, and the Jansky Very Large Array to measure its $\mathrm{H}\mathrm{I}$ content. UGC 9050-Dw1, a neighbor to the low surface brightness spiral UGC 9050, exhibits a unique UV bright central ``clump'' with clearly associated $\mathrm{H}{\mathrm{I}}$ gas and an extended stellar tidal plume to the north. We identify $52^{+4}_{-6}$ GCs, implying a specific frequency $S_\mathrm{N} = 122_{-24}^{+30}$, one of the highest reported for a UDG of this luminosity. Additionally, $\sim 20\%$ of the total light of the galaxy is contributed by GCs. Nearly uniform GC colors suggest they were formed during a single intense episode of star formation. We propose that UGC 9050-Dw1 formed via a rare dwarf merger event where induced, clumpy star formation led to its current observed properties. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_06164 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | The Disturbed and Globular Cluster-Rich Ultra-diffuse Galaxy UGC 9050-Dw1 Fielder, Catherine E. Jones, Michael G. Sand, David J. Bennet, Paul Crnojevic, Denija Karunakaran, Ananthan Mutlu-Pakdil, Burcin Spekkens, Kristine Astrophysics of Galaxies We investigate the ultra-diffuse galaxy (UDG) UGC 9050-Dw1, which was selected because of its disturbed morphology as part of a larger sample of UDGs that display evidence for significant interactions. We use the Hubble Space Telescope's Advanced Camera for Surveys to identify globular clusters (GCs) associated with UGC 9050-Dw1, and the Jansky Very Large Array to measure its $\mathrm{H}\mathrm{I}$ content. UGC 9050-Dw1, a neighbor to the low surface brightness spiral UGC 9050, exhibits a unique UV bright central ``clump'' with clearly associated $\mathrm{H}{\mathrm{I}}$ gas and an extended stellar tidal plume to the north. We identify $52^{+4}_{-6}$ GCs, implying a specific frequency $S_\mathrm{N} = 122_{-24}^{+30}$, one of the highest reported for a UDG of this luminosity. Additionally, $\sim 20\%$ of the total light of the galaxy is contributed by GCs. Nearly uniform GC colors suggest they were formed during a single intense episode of star formation. We propose that UGC 9050-Dw1 formed via a rare dwarf merger event where induced, clumpy star formation led to its current observed properties. |
| title | The Disturbed and Globular Cluster-Rich Ultra-diffuse Galaxy UGC 9050-Dw1 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2306.06164 |