THE RECENT STELLAR ARCHEOLOGY OF M31—THE NEAREST RED DISK GALAXY

@article{Davidge2012THERS,
  title={THE RECENT STELLAR ARCHEOLOGY OF M31—THE NEAREST RED DISK GALAXY},
  author={Timothy John Davidge and Alan W. McConnachie and Mark A. Fardal and Juergen Fliri and David Valls-Gabaud and Scott C. Chapman and Geraint F. Lewis and Robert Michael Rich},
  journal={The Astrophysical Journal},
  year={2012},
  volume={751}
}
We examine the star-forming history of the M31 disk during the past few hundred Myr. The luminosity functions (LFs) of main-sequence stars at distances RGC > 21 kpc (i.e., >4 disk scale lengths) are matched by models that assume a constant star formation rate (SFR). However, at smaller RGC the LFs suggest that during the past ∼10 Myr the SFR was 2–3 times higher than during the preceding ∼100 Myr. The rings of cool gas that harbor a significant fraction of the current star-forming activity are… 
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