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Testing PDR models against ISO fine structure line data for extragalactic sources

Vasta, M. and Barlow, M. J. and Viti, S. and Yates, J. A. and Bell, T. A. (2010) Testing PDR models against ISO fine structure line data for extragalactic sources. Monthly Notices of the Royal Astronomical Society, 404 (4). pp. 1910-1921. ISSN 0035-8711. https://resolver.caltech.edu/CaltechAUTHORS:20100616-142224367

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Abstract

Far-infrared [C ii] 158-μm, [O i] 145-μm and [O i] 63-μm fine structure emission-line fluxes were measured from archival Infrared Space Observatory Long Wavelength Spectrometer spectra of 46 extragalactic sources, with 28 sources providing detections in all three lines. For 12 of the sources, the contribution to the [C ii] 158-μm line flux from H ii regions could be estimated from their detected [N ii] 122-μm line fluxes. The measured [C ii]/[O i] and [O i] 63/145-μm line flux ratios were compared with those from a grid of photodissociation region (PDR) models previously computed using the ucl_pdr code. Persistent offsets between the observed and modelled line ratios could be partly attributed to the effects of [O i] 63-μm self-absorption. Using the Spherical Multi-Mol (smmol) code, we calculated model [O i] line profiles and found that the strength of the [O i] 63-μm line was reduced by 20–80 per cent, depending on the PDR parameters. We conclude that high PDR densities and radiation field strengths, coupled with the effects of [O i] 63-μm self-absorption, are likely to provide the best match to the observed line flux ratios.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1111/j.1365-2966.2010.16402.xDOIUNSPECIFIED
http://www3.interscience.wiley.com/journal/123314698/abstractPublisherUNSPECIFIED
Additional Information: © 2010 The Authors. Journal compilation © 2010 RAS. Accepted 2010 January 22. Received 2010 January 4; in original form 2009 October 16. We thank the referee, Dr N. Abel, for constructive comments that helped improve the paper.MV would like to thank Dr Estelle Bayet for her help throughout this research. Samuel Farrens is thanked for comments.
Subject Keywords:astrochemistry; line: profiles; photodissociation region (PDR); Galaxy: fundamental parameters; infrared: galaxies
Issue or Number:4
Record Number:CaltechAUTHORS:20100616-142224367
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20100616-142224367
Official Citation:Vasta, M., M. J. Barlow, et al. (2010) Testing PDR models against <i>ISO</i> fine structure line data for extragalactic sources. Monthly Notices of the Royal Astronomical Society 1910-1921 DOI: 10.1111/j.1365-2966.2010.16402.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18711
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:15 Jul 2010 23:52
Last Modified:03 Oct 2019 01:46

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