A Counterrotating Bulge in the S(b) Galaxy NGC 7331

  title={A Counterrotating Bulge in the S(b) Galaxy NGC 7331},
  author={Francisco Prada and Carlos M. Guti{\'e}rrez and Reynier F. Peletier and C. D. Mckeith},
  journal={The Astrophysical Journal},
We have found that the bulge of the large, nearby Sb galaxy NGC 7331 rotates retrograde to its disk. Analysis of spectra in the region of the near-IR Ca II triplet along the major axis shows that, in the radial range between 5'' and ~20'', the line-of-sight velocity distribution of the absorption lines has two distinct peaks and can be decomposed into a fast-rotating component with v/σ > 3, and a slower rotating, retrograde component with v/σ ~ 1-1.5. The radial surface brightness profile of… 

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