Galaxies M32 and NGC 5102 confirm a near-infrared spectroscopic chronometer

  title={Galaxies M32 and NGC 5102 confirm a near-infrared spectroscopic chronometer},
  author={Jesse Miner and James A. Rose and Gerald N. Cecil},
  journal={The Astrophysical Journal},
We present near-infrared (NIR) IRTF/SpeX spectra of the intermediate-age galaxy M32 and the post-starburst galaxy NGC 5102. We show that features from thermally pulsing asymptotic giant branch (TP-AGB) and main-sequence turnoff (MSTO) stars yield similar ages to those derived from optical spectra. The TP-AGB can dominate the NIR flux of a coeval stellar population between ~0.1 and ~2 Gyr, and the strong features of (especially C-rich) TP-AGB stars are useful chronometers in integrated light… Expand

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