HST STIS Spectroscopy of the Triple Nucleus of M31: Two Nested Disks in Keplerian Rotation around a Supermassive Black Hole

  title={HST STIS Spectroscopy of the Triple Nucleus of M31: Two Nested Disks in Keplerian Rotation around a Supermassive Black Hole},
  author={Ralf Bender and John Kormendy and Gary A. Bower and Richard Green and Jens Thomas and Anthony C. Danks and Theodore R. Gull and John B. Hutchings and Charles L. Joseph and Mary Elizabeth Anne Kaiser and Tod R. Lauer and Charles H. Nelson and Douglas O. Richstone and D. Weistrop and Bruce E. Woodgate},
  journal={The Astrophysical Journal},
  pages={280 - 300}
We present Hubble Space Telescope (HST) spectroscopy of the nucleus of M31 obtained with the Space Telescope Imaging Spectrograph (STIS). Spectra that include the Ca II infrared triplet (λ ≃ 8500 Å) see only the red giant stars in the double brightness peaks P1 and P2. In contrast, spectra taken at λ ≃ 3600-5100 Å are sensitive to the tiny blue nucleus embedded in P2, the lower surface brightness nucleus of the galaxy. P2 has a K-type spectrum, but we find that the blue nucleus has an A-type… 
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