Radiative transfer modeling of the observed line profiles in G31.41+0.31
Journal article, 2021

An inverse P-Cygni profile of H13CO+ (1 → 0) in G31.41+0.31 was recently observed, which indicates the presence of an infalling gas envelope. Also, an outflow tracer, SiO, was observed. Here, exclusive radiative transfer modelings have been implemented to generate synthetic spectra of some key species (H13CO+, HCN, SiO, NH3, CH3CN, CH3OH, CH3SH, and CH3NCO) and extract the physical features to infer the excitation conditions of the surroundings where they observed. The gas envelope is assumed to be accreting in a spherically symmetric system towards the central hot core region. Our principal intention was to reproduce the observed line profiles toward G31.41+0.31 and extract various physical parameters. The LTE calculation with CASSIS and non-LTE analysis with the RATRAN radiative transfer codes are considered for the modeling purpose. The best-fitted line parameters are derived, which represents the prevailing physical condition of the gas envelope. Our results suggest that an infalling gas could explain the observed line profiles of all the species mentioned above except SiO. An additional outflow component is required to confer the SiO line profile. Additionally, an astrochemical model is implemented to explain the observed abundances of various species in this source.

Astrochemistry

ISM

Line profiles

Kinematics and dynamics

Individual(G31.41+0.31)

Author

Bratati Bhat

Indian Centre for Space Physics

Prasanta Gorai

Indian Centre for Space Physics

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Extragalactic Astrophysics

Suman Kumar Mondal

Indian Centre for Space Physics

Sandip K. Chakrabarti

Indian Centre for Space Physics

Ankan Das

Indian Centre for Space Physics

Advances in Space Research

0273-1177 (ISSN)

Vol. In Press

Subject Categories

Meteorology and Atmospheric Sciences

Astronomy, Astrophysics and Cosmology

Geophysics

DOI

10.1016/j.asr.2021.07.011

More information

Latest update

8/16/2021