The Disturbed and Globular Cluster-Rich Ultra-diffuse Galaxy UGC 9050-Dw1

Ananthan Karunakaran; Burcin Mutlu-Pakdil; Catherine E. Fielder; David J. Sand; Denija Crnojevic; Kristine Spekkens; Michael G. Jones; Paul Bennet

The Disturbed and Globular Cluster-Rich Ultra-diffuse Galaxy UGC 9050-Dw1

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arxiv 2306.06164 v2 pith:TWAPRYGK submitted 2023-06-09 astro-ph.GA

The Disturbed and Globular Cluster-Rich Ultra-diffuse Galaxy UGC 9050-Dw1

Catherine E. Fielder , Michael G. Jones , David J. Sand , Paul Bennet , Denija Crnojevic , Ananthan Karunakaran , Burcin Mutlu-Pakdil , Kristine Spekkens This is my paper

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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.

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Globular cluster distributions as a dynamical probe of dark matter
astro-ph.GA 2025-04 unverdicted novelty 5.0

N-body and semianalytic simulations indicate that globular cluster distributions in UDG1 and Fornax require dark matter halos via dynamical friction, while DF44 yields no strong constraint.