Mechanical feedback in the molecular ISM of luminous IR galaxies

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作者：
Loenen, A.F. [1 ,2 ]
Spaans, M. [1 ]
Baan, W.A. [2 ]
Meijerink, R. [3 ]
机构：
[1] Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, Netherlands
[2] ASTRON, PO Box 2, 7990 AA Dwingeloo, Netherlands
[3] Astronomy Department, University of California, Berkeley, CA 94720, United States
来源：
Astronomy and Astrophysics | 2008年 / 488卷 / 01期
关键词：
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 ( cm) PDRs; and lower-density ( cm) 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 ( cm) PDRs; to a stage where the gas density has decreased ( cm) and mechanical feedback from supernova shocks dominates the heating budget. © 2008 ESO;
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