An Hα atlas of nearby southern spiral galaxies

Stuart D. Ryder*, Michael A. Dopita

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


We present here an atlas of CCD images of 25 nearby southern spiral galaxies taken through narrow-band (15 Å) Hα filters, and accompanying red continuum (6676 Å) images. Most of these galaxies have never previously been imaged in Ha and will complement the earlier photographic atlas of Hodge & Kennicutt. We comment on the individual distributions of the H II regions in relation to the morphology and characteristics of each galaxy. Nearly half of the galaxies surveyed exhibit rather asymmetrical distributions of star formation activity, even though the stellar distributions may be quite regular. Among galaxies possessing both a strong stellar bar and an encircling inner ring, there appears to be a decrease in the number of H II regions tracing out the bar as the number of H II regions in the ring itself increases, and vice versa. The images should prove useful mainly as finding charts for in-depth studies of the H II region populations, as well as for the purposes of determining abundance gradients and the kinematics of these galaxies.

Original languageEnglish
Pages (from-to)415-421
Number of pages7
JournalThe Astrophysical Journal. Supplement Series
Issue number2
Publication statusPublished - 1 Dec 1993
Externally publishedYes


  • Atlases
  • Galaxies: spiral
  • Galaxies: structure
  • H ii regions


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