Survival of Pure Disk Galaxies over the Last 8 Billion Years

  title={Survival of Pure Disk Galaxies over the Last 8 Billion Years},
  author={Sonali Sachdeva and Kanak Saha},
  journal={The Astrophysical Journal},
Pure disk galaxies without any bulge component, i.e., bulges that are neither classical nor pseudo, seem to have escaped the effects of merger activity that are inherent to hierarchical galaxy formation models as well as strong internal secular evolution. We discover that a significant fraction (~15%–18%) of disk galaxies in the Hubble Deep Field () and in the local universe () are such pure disk systems (PDSs). The spatial distribution of light in these PDSs is well-described by a single… Expand

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