The ACS Nearby Galaxy Survey Treasury IV. The Star Formation History of NGC 2976
Benjamin F. Williams, Julianne J. Dalcanton, Adrienne Stilp, Karoline, M. Gilbert, Rok Roskar, Anil C. Seth, Daniel Weisz, Andrew Dolphin, Stephanie, M. Gogarten, Evan Skillman, Jon Holtzman

TL;DR
This study reconstructs the star formation history of NGC 2976, revealing outside-in star formation shutdown linked to gas depletion, influenced by interactions within the M81 group.
Contribution
It provides a detailed spatially-resolved star formation history of NGC 2976, linking star formation patterns to gas dynamics and galaxy interactions.
Findings
Outer disk stars are older, indicating outside-in quenching.
Star formation follows the Schmidt law during the past 0.5 Gyrs.
Gas depletion is causing the current cessation of star formation.
Abstract
We present resolved stellar photometry of NGC 2976 obtained with the Advanced Camera for Surveys (ACS) as part of the ACS Nearby Galaxy Survey Treasury (ANGST) program. The data cover the radial extent of the major axis of the disk out to 6 kpc, or ~6 scale lengths. The outer disk was imaged to a depth of M_F606W ~ 1, and an inner field was imaged to the crowding limit at a depth of M_F606W ~ -1. Through detailed analysis and modeling of these CMDs we have reconstructed the star formation history of the stellar populations currently residing in these portions of the galaxy, finding similar ancient populations at all radii but significantly different young populations at increasing radii. In particular, outside of the well-measured break in the disk surface brightness profile, the age of the youngest population increases with distance from the galaxy center, suggesting that star…
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