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 Allen Bower and Richard Green and Jens Thomas and Anthony C. Danks and T 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 Donna Etta Weistrop and Bruce E. Woodgate},
  journal={The Astrophysical Journal},
We present Hubble Space Telescope (HST) spectroscopy of the nucleus of M31 obtained with the Space TelescopeImagingSpectrograph(STIS).SpectrathatincludetheCaiiinfraredtriplet(k ’ 85008)seeonlythered giant stars in the double brightness peaks P1 and P2. In contrast, spectra taken atk ’ 3600 51008 are sensitive to thetinybluenucleusembeddedinP2,thelowersurfacebrightnessnucleusofthegalaxy.P2 hasaK-typespectrum, but we find that the blue nucleus has an A-type spectrum: it shows strong Balmer… Expand
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