TRAO Survey of Nearby Filamentary Molecular clouds, the Universal Nursery of Stars (TRAO FUNS) I. Dynamics and Chemistry of L1478 in the California Molecular Cloud

Abstract

"TRAO FUNS" is a project to survey Gould Belt's clouds in molecular lines. This paper presents its first results on the central region of the California molecular cloud, L1478. We performed On-The-Fly mapping observations using the Taedeok Radio Astronomy Observatory (TRAO) 14m single dish telescope equipped with a 16 multi-beam array covering $\sim$1.0 square degree area of this region using C${}^{18}$O (1-0) mainly tracing low density cloud and about 460 square arcminute area using N${}_2$H${}^{+}$ (1-0) mainly tracing dense cores. CS (2-1) and SO $(3_2-2_1)$ were also used simultaneously to map $\sim$440 square arcminute area of this region. We identified 10 filaments by applying the dendrogram technique to the C${}^{18}$O data-cube and 8 dense N${}_2$H${}^{+}$ cores by using {\sc FellWalker}. Basic physical properties of filaments such as mass, length, width, velocity field, and velocity dispersion are derived. It is found that L1478 consists of several filaments with slightly different velocities. Especially the filaments which are supercritical are found to contain dense cores detected in N${}_2$H${}^{+}$. Comparison of non-thermal velocity dispersions derived from C${}^{18}$O and N${}_2$H${}^{+}$ for the filaments and dense cores indicates that some of dense cores share similar kinematics with those of the surrounding filaments while several dense cores have different kinematics with those of their filaments. This suggests that the formation mechanism of dense cores and filaments can be different in individual filaments depending on their morphologies and environments.

25 pages, 15 figures, accepted for publication in ApJ

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Cited by in corpus (15)

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• ALMA observations of NGC 6334S. II. Subsonic and Transonic Narrow Filaments in a High-mass Star Formation Cloud
• Characterizing the line emission from molecular clouds. II. A comparative study of California, Perseus, and Orion A
• TRAO Survey of the nearby filamentary molecular clouds, the universal nursery of stars (TRAO FUNS). II. Filaments and Dense cores in IC 5146
• A wide-field CO survey towards the California Molecular Filament
• Evolution of the Hub-filament Structures in IC 5146 in the Context of the Energy Balance of Gravity, Turbulence, and Magnetic Field
• Role of Filamentary Structures in the Formation of Two Dense Cores, L1544 and L694-2
• Magnetic Fields and Fragmentation of Filaments in the Hub of California-X
• Characterization of dense Planck clumps observed with Herschel and SCUBA-2
• Probing the filamentary nature of star formation in the California giant molecular cloud
• The Formation of Filaments and Dense cores in the Cocoon Nebula (IC~5146)
• Prestellar Cores in Turbulent Clouds: Properties of Critical Cores
• Parallel and Perpendicular Alignments of Velocity Gradient and Magnetic Field observed in the Molecular Clouds L1478 and L1482
• From inter-filamentary gas to filaments and hubs: gas flows in the Mon R2 hub-filament system
• FIRESTORM I: Stellar Feedback and Gas Kinematics in the Evolved W40 Hub-Filament System