HST Imaging of the Local Volume Dwarf Galaxies Pisces A&B: Prototypes for Local Group Dwarfs
Erik J. Tollerud, Marla C. Geha, Jana Grcevich, Mary E. Putman, Daniel, R. Weisz, Andrew E. Dolphin

TL;DR
This study uses Hubble Space Telescope imaging and Bayesian methods to determine the distances and star formation histories of the nearby dwarf galaxies Pisces A and B, revealing their recent star formation activity and their location at the void-filament boundary.
Contribution
The paper introduces a Bayesian approach to accurately measure galaxy distances using the RGB tip and applies it to Pisces A and B, providing new insights into their evolution and environment.
Findings
Distances of 5.64 Mpc and 8.89 Mpc for Pisces A and B.
Recent increase in star formation rates in both galaxies.
Galaxies located at the void-filament boundary, indicating delayed evolution.
Abstract
We present observations of the Pisces A and B galaxies with the Advanced Camera for Surveys on the Hubble Space Telescope. Photometry from these images clearly resolve a Red Giant Branch for both objects, demonstrating that they are nearby dwarf galaxies. We describe a Bayesian inferential approach to determining the distance to these galaxies using the magnitude of the tip of the RGB, and then apply this approach to these galaxies. We also provide the full probability distributions for parameters derived using this approach. This reveals the distance to these galaxies as and for Pisces A and B, respectively, placing both within the Local Volume but not the Local Group. We estimate the star formation histories of these galaxies, which suggests that they have recently undergone an increase in their star formation…
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