NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-18 T02:41:30 PDT
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For refcode 2010MNRAS.404.1910V:
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NED Abstract

Copyright by Royal Astronomical Society. 2010MNRAS.404.1910V Testing PDR models against ISO fine structure line data for extragalactic sources Vasta, M.; Barlow, M. J.; Viti, S.; Yates, J. A.; Bell, T. A. Abstract. Far-infrared [CII] 158- micron, [OI] 145-micron and [OI] 63-micron 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 [CII] 158-micron line flux from HII regions could be estimated from their detected [NII] 122-micron line fluxes. The measured [CII]/[OI] and [OI] 63/145-micron 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 [OI] 63-micron self-absorption. Using the Spherical Multi-Mol (SMMOL) code, we calculated model [OI] line profiles and found that the strength of the [OI] 63-micron 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 [OI] 63-micron self-absorption, are likely to provide the best match to the observed line flux ratios. Key words: astrochemistry, line: profiles, photodissociation region (PDR), Galaxy: fundamental parameters, infrared: galaxies
Retrieve 44 NED objects in this reference.
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