The undiscovered ultra-diffuse galaxies of the Local Group
Oliver Newton (1,2), Arianna Di Cintio (3,4), Salvador Cardona-Barrero, (3,4), Noam I. Libeskind (5,2), Yehuda Hoffman (6), Alexander Knebe (7,8,9),, Jenny Sorce (10,11,5), Matthias Steinmetz (5), and Elmo Tempel (12,13) ((1), Center for Theoretical Physics

TL;DR
This study predicts a significant population of isolated ultra-diffuse galaxies in the Local Group using hydrodynamic simulations, indicating many remain undiscovered and could be detected with future surveys.
Contribution
First to use hydrodynamic constrained simulations to predict the number and properties of UDGs in the Local Group, including their detectability in current and future surveys.
Findings
Approximately 12±3 isolated UDGs within 2.5 Mpc of the Local Group.
2+2−1 UDGs are detectable in SDSS footprint.
Almost all UDGs in the Local Group field could be observable in future all-sky surveys.
Abstract
Ultra-diffuse galaxies (UDGs) are attractive candidates to probe cosmological models and test theories of galaxy formation at low masses; however, they are difficult to detect because of their low surface brightness. In the Local Group a handful of UDGs have been found to date, most of which are satellites of the Milky Way and M31, and only two are isolated galaxies. It is unclear whether so few UDGs are expected. We address this by studying the population of UDGs formed in hydrodynamic constrained simulations of the Local Group from the HESTIA suite. For a Local Group with a total enclosed mass , we predict that there are isolated UDGs (68% confidence) with stellar masses and effective radii , within 2.5 Mpc of the Local…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research · Space Technology and Applications
