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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 358628.0, MPI für Astronomie / Publikationen_mpia
Do we need to know the temperature in prestellar cores?
Authors:Pavlyuchenkov, Y.; Henning, T.; Wiebe, D.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:The Astrophysical Journal
Volume:669
Start Page:L101
End Page:L104
Audience:Not Specified
Abstract / Description:Molecular line observations of starless (prestellar) cores combined with a chemical evolution modeling and radiative transfer calculations are a powerful tool to study the earliest stages of star formation. However, conclusions drawn from such a modeling may noticeably depend on the assumed thermal structure of the cores. The assumption of isothermality, which may work well in chemo-dynamical studies, becomes a critical factor in molecular line formation simulations. We argue that even small temperature variations, which are likely to exist in starless cores, can have a nonnegligible effect on the interpretation of molecular line data and derived core properties. In particular, ``chemically pristine'' isothermal cores (low depletion) can have centrally peaked C18O and C34S radial intensity profiles, while having ringlike intensity distributions in models with a colder center and/or warmer envelope assuming the same underlying chemical structure. Therefore, derived molecular abundances based on oversimplified thermal models may lead to a misinterpretation of the line data.
Free Keywords:Astrochemistry; ISM: Molecules; Line: Profiles; Stars: Formation
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2007ApJ...669L.101P
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