A New Reference Chemical Composition for TMC-1

Abstract

Recent detections of complex organic molecules in dark clouds have rekindled interest in the astrochemical modeling of these environments. Because of its relative closeness and rich molecular complexity, TMC-1 has been extensively observed to study the chemical processes taking place in dark clouds. We use local thermodynamical equilibrium radiative transfer modeling coupled with a Bayesian statistical method which takes into account outliers to analyze the data from the Nobeyama spectral survey of TMC-1 between 8 and 50 GHz. We compute the abundance relative to molecular hydrogen of 57 molecules, including 19 isotopologues in TMC-1 along with their associated uncertainty. The new results are in general agreement with previous abundance determination from Ohishi & Kaifu and the values reported in the review from Agundez & Wakelam. However, in some cases, large opacity and low signal to noise effects allow only upper or lower limits to be derived, respectively.

Accepted for publication in ApJS

References in corpus (11)

• emcee: The MCMC Hammer
• Formation of methyl formate and other organic species in the warm-up phase of hot molecular cores
• Chemistry of Dark Clouds: Databases, Networks, and Models
• Reactive Desorption and Radiative Association as Possible Drivers of Complex Molecule Formation in the Cold Interstellar Medium
• The origin of complex organic molecules in prestellar cores
• Complex molecules in the hot core of the low mass protostar NGC1333-IRAS4A
• Detection of HC11N in the Cold Dust Cloud TMC-1
• Modeling Complex Organic Molecules in dense regions: Eley-Rideal and complex induced reaction
• Molecular Carbon Chains and Rings in TMC-1
• New extended deuterium fractionation model: assessment at dense ISM conditions and sensitivity analysis
• Implication of Formation Mechanisms of HC5N in TMC-1 as Studied by 13C Isotopic Fractionation

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