Discovery of CCS Velocity-Coherent Substructures in the Taurus Molecular Cloud 1

Abstract

We present the results of mapping observations toward a nearby starless filamentary cloud, the Taurus Molecular Cloud 1 (TMC-1), in the CCS(JN=43-32, 45.379033 GHz) emission line, using the Nobeyama 45-m telescope. The map shows that the TMC-1 filament has a diameter of ~0.1 pc and a length of ~0.5 pc at a distance of 140 pc. The position-velocity diagrams of CCS clearly indicate the existence of velocity-coherent substructures in the filament. We identify 21 substructures that are coherent in the position-position-velocity space by eye. Most of the substructures are elongated along the major axis of the TMC-1 filament. The line densities of the subfilaments are close to the critical line density for the equilibrium (~17 Mo/pc for the excitation temperature of 10 K), suggesting that self-gravity should play an important role in the dynamics of the subfilaments.

To appear in the Astrophysical Journal

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Cited by in corpus (14)

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• Discovery of Interstellar 2-Cyanoindene (2-C${}_9$H${}_7$CN) in GOTHAM Observations of TMC-1
• Early Science from GOTHAM: Project Overview, Methods, and the Detection of Interstellar Propargyl Cyanide (HCCCH${}_2$CN) in TMC-1
• Carbon-Chain Chemistry in the Interstellar Medium
• Astronomical Detection of the Interstellar Anion C10H- towards TMC-1 from the GOTHAM Large Program on the GBT
• The spatial distribution of an aromatic molecule, C6H5CN, in the cold dark cloud TMC-1
• Detection of Interstellar $E$-1-cyano-1,3-butadiene in GOTHAM Observations of TMC-1
• Discovery of Interstellar trans-cyanovinylacetylene (HCCCH=CHCN) and vinylcyanoacetylene (H${}_2$C=CHC${}_3$N) in GOTHAM Observations of TMC-1
• First images of phosphorus molecules towards a proto-Solar analog
• VLA ammonia observations of L1287: analysis of the "Guitar" core and two filaments
• Velocity-Coherent Substructure in TMC-1: Inflow and Fragmentation
• Studying the chemical and kinematical structures of dense cores TMC-1C, L1544, and TMC-1 in the Taurus molecular cloud using the CCS and NH3 observations
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