H2 infrared line emission from S140: A warm PDR

R. Timmermann, F. Bertoldi, C. M. Wright, S. Drapatz, B. T. Draine, L. Haser, A. Sternberg

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ISO SWS spectra of H2 pure rotational and rovibrational transitions, as well as [FeII], and [SiII] fine structure lines were obtained for one position on the photodissociation region (PDR) adjacent to the bright rim of the S140 HII region. The gas density is ≈ 104 cm-3 and the incident UV flux χ ≈ 400 at the location of the ionization front. Our PDR model analysis shows that the relative H2 line intensities are characteristic of low-density fluorescent emission and that the gas temperature is T > 500K in the partially dissociated gas. A comparison of predicted and observed fine structure line intensities permits an estimate of the abundances of Fe and Si.

Original languageEnglish (US)
Pages (from-to)L281-L284
JournalAstronomy and Astrophysics
Issue number2
StatePublished - Nov 10 1996

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Abundances
  • HII regions
  • ISM: individual: S140
  • Infrared: ISM: lines and bands
  • Molecules
  • Reflection nebulae


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