The HCO+ emission excess in bipolar outflows

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, that 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 that 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.

MNRAS, accepted. 10 pages, 6 figures

References in corpus (4)

• The Episodic, Precessing Giant Molecular Outflow from IRAS 04239+2436 (HH 300)
• Tracing the envelopes around embedded low-mass young stellar objects with HCO+ and millimeter-continuum observations
• Bow shocks, Wiggling Jets, and Wide-Angle Winds: A High Resolution Study of the Entrainment Mechanism of the PV Ceph Molecular (CO) Outflow
• Radiative Transfer Modelling of the Accretion Flow onto a Star-Forming Core in W51

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