Bulgeless Giant Galaxies Challenge Our Picture Of Galaxy Formation By Hierarchical Clustering

  title={Bulgeless Giant Galaxies Challenge Our Picture Of Galaxy Formation By Hierarchical Clustering},
  author={John Kormendy and Niv Drory and Ralf Bender and Mark Edward Cornell},
  journal={The Astrophysical Journal},
To better understand the prevalence of bulgeless galaxies in the nearby field, we dissect giant Sc-Scd galaxies with Hubble Space Telescope (HST) photometry and Hobby-Eberly Telescope (HET) spectroscopy. We use the HET High Resolution Spectrograph (resolution R ? ?/FWHM 15, 000) to measure stellar velocity dispersions in the nuclear star clusters and (pseudo)bulges of the pure-disk galaxies M 33, M 101, NGC?3338, NGC?3810, NGC?6503, and NGC?6946. The dispersions range from 20 ? 1?km?s?1 in the… Expand
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