Do luminous elliptical galaxies have young disks?

Richard M. McDermid, Harald Kuntschner, Roger L. Davies

Research output: Contribution to journalReview article

Abstract

Since the mid-1970s, it has become clear that, rather than being uncomplicated
dynamical systems, elliptical galaxies exhibit a rich variety of shapes, internal
dynamics and stellar populations. Disky galaxies have correspondingly higher Hβ
indices (de Jong and Davies, 1997). Using Hβ as an indicator of age (Worthey,
1994), this correlation implies that disky galaxies tend to have a lower luminosityweighted age than boxy galaxies. This observed trend can be explained by superimposing a young (2 Gyr) disk population on an old (12 Gyr) spheroidal population. Here we seek dynamical evidence for such disks.
Original languageEnglish
Pages (from-to)341
Number of pages1
JournalAstrophysics and Space Science
Volume277
Issue numberSupplement
DOIs
Publication statusPublished - 2001

Keywords

  • Disks
  • Dynamics
  • Galaxies: elliptical
  • Kinematics
  • Stellar populations

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