The Outer Structure of Galactic Disks: Connections Between Bars, Disks, and Environments

摘要

Surface-brightness profiles for early-type (S0-Sb) disks exhibit three mainclasses (Type I, II, and III). Type II profiles are more common in barredgalaxies, and most of the time appear to be related to the bar's Outer LindbladResonance. Roughly half of barred galaxies in the field have Type II profiles,but almost none in the Virgo Cluster do; this might be related to ram-pressurestripping in clusters. A strong \textit{anti}correlation is found between TypeIII profiles ("antitruncations") and bars: Type III profiles are most commonwhen there is no bar, and least common when there is a strong bar.