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HCO+ emission excess in bipolar outflows

Rawlings, JMC; Redman, MP; Keto, E; Williams, DA; (2004) HCO+ emission excess in bipolar outflows. MON NOT R ASTRON SOC , 351 (3) 1054 - 1062. 10.1111/j.1365-2966.2004.07855.x. Green open access

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Abstract

A plausible model is proposed for the enhancement of the abundance of molecular species in bipolar outflow sources. In this model, levels of HCO+ enhancement are considered based on previous chemical calculations, which are assumed to result from shock-induced desorption and photoprocessing of dust grain ice mantles in the boundary layer between the outflow jet and the surrounding envelope. A radiative transfer simulation that incorporates chemical variations within the flow shows that the proposed abundance enhancements in the boundary layer are capable of reproducing the observed characteristics of the outflow seen in HCO+ emission in the star-forming core L1527. The radiative transfer simulation also shows that the emission lines from the enhanced molecular species, which trace the boundary layer of the outflow, exhibit complex line profiles, indicating that detailed spatial maps of the line profiles are essential in any attempt to identify the kinematics of potential infall/outflow sources. This study is one of the first applications of a full three-dimensional radiative transfer code which incorporates chemical variations within the source.

Type: Article
Title: HCO+ emission excess in bipolar outflows
Open access status: An open access version is available from UCL Discovery
DOI: 10.1111/j.1365-2966.2004.07855.x
Publisher version: http://dx.doi.org/10.1111/j.1365-2966.2004.07855.x
Language: English
Additional information: © 2004 RAS Definitive versions of articles pre-2013 are available at http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966, now published by http://mnras.oxfordjournals.org
Keywords: stars : formation, ISM : clouds, ISM : jets and outflows, ISM : molecules., YOUNG STELLAR OBJECTS, RADIATIVE-TRANSFER, MOLECULAR OUTFLOWS, CO OUTFLOWS, ACCRETION, ENVELOPES, CONTINUUM, MECHANISM, FLOW, JET
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/144297
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