An Ultra diffuse Galaxy in the NGC 5846 group from the VEGAS survey

Duncan A. Forbes; Enrichetta Iodice; Jonah Gannon; Marilena Spavone; Michele Cantiello; Nicola Napolitano; Pietro Schipani; Warrick J Couch

arxiv: 1905.06415 · v1 · pith:M5GH645Snew · submitted 2019-05-15 · 🌌 astro-ph.GA

An Ultra diffuse Galaxy in the NGC 5846 group from the VEGAS survey

Duncan A. Forbes , Jonah Gannon , Warrick J Couch , Enrichetta Iodice , Marilena Spavone , Michele Cantiello , Nicola Napolitano , Pietro Schipani This is my paper

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keywords udgsclustersgalaxiesgroupsurveyvegasdiffusegalaxy

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Many ultra diffuse galaxies (UDGs) have now been identified in clusters of galaxies. However, the number of nearby UDGs suitable for detailed follow-up remain rare. Our aim is to begin to identify UDGs in the environments of nearby bright early-type galaxies from the VEGAS survey. Here we use a deep g band image of the NGC 5846 group, taken as part of the VEGAS survey, to search for UDGs. We found one object with properties of a UDG if it associated with the NGC 5846 group, which seems likely. The galaxy, we name NGC 5846$\_$UDG1, has an absolute magnitude of M$_g$ = -14.2, corresponding to a stellar mass of $\sim$10$^8$ M$_{\odot}$. It also reveals a system of compact sources which are likely globular clusters. Based on the number of globular clusters detected we estimate a halo mass that is greater than 8$\times$10$^{10}$ M$_{\odot}$ for UDG1.

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Globular cluster distributions as a dynamical probe of dark matter
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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.