A Numerical Synthesis of Molecular Lines from the UV-heated Outflow walls in the Embedded Protostellar Objects

Details A Numerical Synthesis of Molecular Lines from the UV-heated Outflow walls in the Embedded Protostellar Objects A Numerical Synthesis of Molecular Lines from the UV-heated Outflow walls in the Embedded Protostellar Objects

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21944407l&link_type=abstract

American Astronomical Society, AAS Meeting #219, #444.07

Astronomy and Astrophysics

Astronomy

Scientific paper

An UV-heated outflow wall can reproduce the warm CO emission in the Herschel/PACS observations of embedded protostellar objects. We have developed improved models of Photo Dominated Region (PDR) and Non-LTE line radiative transfer (RT) to synthesize the Herschel FIR observations more accurately and self-consistently. A new (r, δ) coordinate system was used, where the r is the distance from the origin and the δ is z/R2 in the cylindrical coordinate of (R, z). This is an adequate coordinate system to represent a power-law density of an envelope and a high spatial resolution near the outflow wall. The PDR model solves the FUV continuum radiative transfer, gas energetics, and chemistry simultaneously. A local FUV radiation flux is calculated by using a Monte Carlo method taking anisotropic scattering into account. The RT was developed from the RATRAN code (Hogertheijde & van de Tak 2000) using an accelerated Monte-Carlo method, and it can cope with line overlap effect among multiple molecular and atomic species. These newly developed models can be used to analyze quantitatively the effect of UV-heated outflow walls on the warm molecular lines in the embedded protostellar objects.

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