Surprisingly weak fine-structure line emission from S 140

Ossenkopf, V., Koumpia, E., Okada, Y., Mookerjea, B. & van der Tak, F. F. S., 2016, Conditions and Impact of Star Formation. Vol. 75-76. p. 199-200 2 p. (EAS Publications Series).

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GREAT observations of the [Oi] and [Cii] fine-structure lines in S 140 show very low intensities towards the embedded sources. We measure line-to-continuum cooling ratios of 10-5 - 10-4, i.e. values matching the far-IR line deficit seen in ULIRGs. Normal PDR models fail to explain the combination of source size, line ratios, and absolute line intensities. A match is, however, possible when modelling the sources in terms of inside-out PDRs. The small beam-filling of PDRs in a dense homogeneous medium can lead to a line deficit compared to the infrared continuum, emitted from a much larger region.
Original languageEnglish
Title of host publicationConditions and Impact of Star Formation
Number of pages2
Publication statusPublished - 2016

Publication series

NameEAS Publications Series

ID: 40852054