On the ionization conditions in the interarm gas of M 33

  • P. Benvenuti
  • S. D'Odorico
Part V: Large-Scale Distribution of H II Regions
Part of the Lecture Notes in Physics book series (LNP, volume 42)


Deep spectroscopic observations of the galaxy Messier 33 in the spectral region λλ 4300–6700 Å show the presence of the λ 5007 Å emission line of [O III] in the interarm region. We derive for the log I(5OO7)/I(Hß) a preliminary value of .12, which indicates moderate ionization conditions in the interarm gas.


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Copyright information

© Springer-Verlag 1975

Authors and Affiliations

  • P. Benvenuti
    • 1
  • S. D'Odorico
    • 1
  1. 1.Osservatorio Astrofisico di Asiago Universitá di PadovaItaly

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