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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 421511.0, MPI für Astronomie / Publikationen_mpia
Molecular emission line formation in prestellar cores
Authors:Pavlyuchenkov, Ya; Wiebe, D.; Shustov, B.; Henning, Th; Launhardt, R.; Semenov, D.
Date of Publication (YYYY-MM-DD):2008
Title of Journal:The Astrophysical Journal
Start Page:335
End Page:350
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We investigate general aspects of molecular line formation under conditions typical of prestellar cores. Focusing on simple linear molecules, we study the formation of their rotational lines with radiative transfer simulations. We present a thermalization diagram to show the effects of collisions and radiation on the level excitation. We construct a detailed scheme (contribution chart) to illustrate the formation of emission-line profiles. This chart can be used as an efficient tool to identify which parts of the cloud contribute to a specific line profile. We show how molecular line characteristics for uniform model clouds depend on hydrogen density, molecular column density, and kinetic temperature. The results are presented in a two-dimensional plane to illustrate mutual effects of the physical factors. We also use a core model with a nonuniform density distribution and chemical stratification to study the effects of cloud contraction and rotation on spectral line maps. We discuss the main issues that should be taken into account when dealing with interpretation and simulation of observed molecular lines.
Free Keywords:ISM: Clouds; Line: Formation; Line: Profiles; Radiative Transfer; Stars: Formation
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2008ApJ...689..335P [ID No:1]
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