The Recent Star Formation Histories of M81 Group Dwarf Irregular Galaxies
Daniel R. Weisz, Evan D. Skillman, John M. Cannon, Andrew E. Dolphin,, Robert C. Kennicutt Jr., Janice Lee, Fabian Walter

TL;DR
This study analyzes the star formation histories of nine dwarf irregular galaxies in the M81 Group using Hubble Space Telescope data, revealing minor differences across luminosities and highlighting stochastic star formation as a key factor.
Contribution
It provides a comparative analysis of SFHs in M81 Group dIs and Local Group counterparts, and investigates the nature of potential tidal dwarf galaxies.
Findings
Minor differences in SF characteristics across luminosities
Star formation appears largely stochastic in dIs
Some candidate tidal dwarfs are not true dIs
Abstract
We present observations and analysis of nine dwarf irregular galaxies (dIs) in the M81 Group taken with the Advanced Camera for Surveys aboard the Hubble Space Telescope. The nine galaxy sample (the Garland, M81 Dwarf A, DDO 53, Ho IX, Ho I, DDO 165, NGC 2366, Ho II, and IC 2574) spans 6 magnitudes in luminosity, a factor of 1000 in current star formation rate, and 0.5 dex in metallicity. Here we use color-magnitude diagrams of resolved stellar populations to study the star formation histories (SFHs) of these galaxies. We divide the sample into faint and bright galaxies, with a dividing line of M_ = -15, and then analyze the similarities and differences in the SFHs, birthrate parameters, fraction of stars formed per time interval, and spatial distribution of stellar components. Comparing these parameters as a function of luminosity, we find only minor differences in SF…
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