2004/03/19 by J. M. C. Rawlings, J. M. C Rawlings, M. P. Redman +2 · 3 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Atmospheric radiative transfer codes #Bipolar outflow #Boundary layer #Flow (mathematics) #Free molecular flow #Galaxies: Formation, Evolution, Phenomena #Line (geometry) #Opacity #Outflow #Radiative transfer #astro-ph
paper · pdf · doi:10.1111/j.1365-2966.2004.07855.x
published as Mon.Not.Roy.Astron.Soc. 351 (2004) 1054 · MNRAS, accepted. 10 pages, 6 figures
arxiv created 2004/03/19 · openalex publication_date 2004/06/23 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.