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 (3)

• Formation of methyl formate and other organic species in the warm-up phase of hot molecular cores
• The origin of complex organic molecules in prestellar cores
• Modeling Complex Organic Molecules in dense regions: Eley-Rideal and complex induced reaction

Cited by in corpus (4)

• Chemical complexity induced by efficient ice evaporation in the Barnard 5 molecular cloud
• Non-Detection of HC${}_{11}$N toward TMC-1: Constraining the Chemistry of Large Carbon-Chain Molecules
• Detection of Interstellar HC${}_5$O in TMC-1 with the Green Bank Telescope
• Deep K-band observations of TMC-1 with the Green Bank Telescope: Detection of HC7O, non-detection of HC11N, and a search for new organic molecules