Modelling carbon radio recombination line observations towards the ultracompact H II region W48A

Jeyakumar, S.; Roshi, Anish D.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/5853

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DC Field	Value	Language
dc.contributor.author	Jeyakumar, S.	-
dc.contributor.author	Roshi, Anish D.	-
dc.date.accessioned	2014-02-17T11:22:12Z	-
dc.date.available	2014-02-17T11:22:12Z	-
dc.date.issued	2013-10-01	-
dc.identifier.citation	Monthly Notices of the Royal Astronomical Society, 2013, Vol. 434, p2742.	en
dc.identifier.issn	1745-3933 (online)	-
dc.identifier.uri	http://hdl.handle.net/2289/5853	-
dc.description	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)	en
dc.description.abstract	We model the carbon recombination line (CRL) emission from the photodissociation region (PDR) surrounding the ultracompact (UC) H ii region W48A. Our modelling shows that the inner regions (AV ∼ 1) of the C ii layer in the PDR contribute significantly to the CRL emission. Using models spanning over a large range of parameters that are typical for the environments of UCH ii regions, we explore the dependence of the line ratios of CRL emission on the density of the PDR and on the far-ultraviolet radiation incident in the region. We find that it is possible to constrain the density of the PDR by observing a suitable set of CRLs. If the neutral density in the PDR is high ( ≳ 107 cm−3), then the CRL emission is bright at high frequencies ( ≳ 20 GHz), and the absorption lines from such regions can be detected at low frequencies ( ≲ 10 GHz). By modelling CRL observations towards W48A, we can show that the UCH ii region is embedded in a molecular cloud with a density of about 4 × 107 cm−3	en
dc.language.iso	en	en
dc.publisher	Oxford University Press	en
dc.relation.uri	http://adsabs.harvard.edu/abs/2013MNRAS.434.2742J	en
dc.relation.uri	http://arxiv.org/abs/1306.3147	en
dc.relation.uri	http://dx.doi.org/10.1093/mnras/stt1073	en
dc.rights	2013 The Authors &The Royal Astronomical Society	en
dc.subject	atomic processes	en
dc.subject	ISM: clouds	en
dc.subject	radio lines: ISM	en
dc.title	Modelling carbon radio recombination line observations towards the ultracompact H II region W48A	en
dc.type	Article	en
Appears in Collections:	Research Papers (A&A)

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