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Mechanical feedback in the molecular ISM of luminous IR galaxies
ASTRON, PO Box 2, 7990 AA Dwingeloo, The Netherlands .
2008 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 488, no 1, p. L5-L8Article in journal, Letter (Refereed) Published
Abstract [en]

Aims. Molecular emission lines originating in the nuclei of luminous infra-red galaxies are used to determine the physical properties of the nuclear ISM in these systems.

Methods. A large observational database of molecular emission lines is compared with model predictions that include heating by UV and X-ray radiation, mechanical heating, and the effects of cosmic rays.

Results. The observed line ratios and model predictions imply a separation of the observed systems into three groups: XDRs, UV-dominated high-density ( $n \geq 10^5$ cm-3) PDRs, and lower-density ( n = 104.5 cm-3) PDRs that are dominated by mechanical feedback.

Conclusions. The division of the two types of PDRs follows naturally from the evolution of the star formation cycle of these sources, which evolves from deeply embedded young stars, resulting in high-density ( $n \geq 10^5$ cm-3) PDRs, to a stage where the gas density has decreased ( n = 104.5 cm-3) and mechanical feedback from supernova shocks dominates the heating budget.

Place, publisher, year, edition, pages
EDP Sciences , 2008. Vol. 488, no 1, p. L5-L8
Keyword [en]
ISM: molecules -- galaxies: ISM -- galaxies: starburst -- galaxies: active -- infrared: galaxies -- radio lines: galaxies
National Category
Physical Sciences
Research subject
Natural Science, Physics
Identifiers
URN: urn:nbn:se:vxu:diva-4050DOI: 10.1051/0004-6361:200810327OAI: oai:DiVA.org:vxu-4050DiVA, id: diva2:204007
Available from: 2009-01-08 Created: 2009-01-08 Last updated: 2017-12-13Bibliographically approved

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Publisher's full texthttp://www.aanda.org/index.php?option=article&access=doi&doi=10.1051/0004-6361:200810327

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Baan, Willem A.

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
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