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Andromeda XXV -- a dwarf galaxy with a low central dark matter density
Emily J. E. Charles, Michelle L. M. Collins, R. Michael Rich +7
Andromeda (And) XXV has previously been reported as a dwarf spheroidal galaxy (dSph) with little-to-no dark matter. However, the uncertainties on this result were significant. In t…
A detailed star formation history for the extremely diffuse Andromeda XIX dwarf galaxy
Michelle L. M. Collins, Benjamin F. Williams, Erik J. Tollerud +3
We present deep imaging of the ultra-diffuse Andromeda XIX dwarf galaxy from the Advance Camera for Surveys on the Hubble Space Telescope which resolves its stellar populations to…
Six More Ultra-Faint Milky Way Companions Discovered in the DECam Local Volume Exploration Survey
W. Cerny, C. E. Martínez-Vázquez, A. Drlica-Wagner +28
We report the discovery of six ultra-faint Milky Way satellites discovered through matched-filter searches conducted using Dark Energy Camera (DECam) data processed as part of the…
The Hubble Space Telescope Survey of M31 Satellite Galaxies I. RR Lyrae-based Distances and Refined 3D Geometric Structure
Alessandro Savino, Daniel R. Weisz, Evan D. Skillman +33
We measure homogeneous distances to M31 and 38 associated stellar systems (16.8 6.0), using time-series observations of RR Lyrae stars taken as part of the Hubbl…
Observational constraints on stellar feedback in dwarf galaxies
Michelle L. M. Collins, Justin I. Read
Feedback to the interstellar medium (ISM) from ionising radiation, stellar winds and supernovae is central to regulating star formation in galaxies. Due to their low mass ($M_{*} <…
Pegasus V -- a newly discovered ultra-faint dwarf galaxy on the outskirts of Andromeda
Michelle L. M. Collins, Emily J. E. Charles, David Martínez-Delgado +5
We report the discovery of an ultra-faint dwarf in the constellation of Pegasus. Pegasus~V (Peg~V) was initially identified in the public imaging data release of the DESI Legacy Im…