PHAST data yield spatially resolved SFHs across M31's southern disk showing a global recent SFR decline driven by reduced ring activity, with mean rates of 0.445 and 0.285 solar masses per year over the last 100 and 20 Myr.
Shown in Figure15, are the SFH results for all PHAST regions with density lower than 1.5 stars per arcsecond 2, extending back to 1.2 Gyr
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The Panchromatic Hubble Andromeda Southern Treasury (PHAST). II. The Spatially Resolved Recent Star Formation History in M31
PHAST data yield spatially resolved SFHs across M31's southern disk showing a global recent SFR decline driven by reduced ring activity, with mean rates of 0.445 and 0.285 solar masses per year over the last 100 and 20 Myr.