CO~($J=1-0$) Observations of a Filamentary Molecular Cloud in the Galactic Region Centered at $l = 150\arcdeg, b = 3.5\arcdeg$

Abstract

We present large-field (4.25~$\times$~3.75 deg${}^2$) mapping observations toward the Galactic region centered at $l = 150\arcdeg, b = 3.5\arcdeg$ in the $J=1-0$ emission line of CO isotopologues (${}^{12}$CO, ${}^{13}$CO, and C${}^{18}$O), using the 13.7 m millimeter-wavelength telescope of the Purple Mountain Observatory. Based on the ${}^{13}$CO observations, we reveal a filamentary cloud in the Local Arm at a velocity range of $-$0.5 to 6.5~km~s${}^{-1}$. This molecular cloud contains 1 main filament and 11 sub-filaments, showing the so-called "ridge-nest" structure. The main filament and three sub-filaments are also detected in the C${}^{18}$O line. The velocity structures of most identified filaments display continuous distribution with slight velocity gradients. The measured median excitation temperature, line width, length, width, and linear mass of the filaments are $\sim$9.28~K, 0.85~km~s${}^{-1}$, 7.30~pc, 0.79~pc, and 17.92~$M_\sun$~pc${}^{-1}$, respectively, assuming a distance of 400~pc. We find that the four filaments detected in the C${}^{18}$O line are thermally supercritical, and two of them are in the virialized state, and thus tend to be gravitationally bound. We identify in total 146 ${}^{13}$CO clumps in the cloud, about 77$\%$ of the clumps are distributed along the filaments. About 56$\%$ of the virialized clumps are found to be associated with the supercritical filaments. Three young stellar object (YSO) candidates are also identified in the supercritical filaments, based on the complementary infrared (IR) data. These results indicate that the supercritical filaments, especially the virialized filaments, may contain star-forming activities.

arXiv comment48 pages, 24 figures, 3 tables. Published by Astrophysical Journal

References in corpus (31)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Milky Way in Molecular Clouds: A New Complete CO Survey
• From filamentary clouds to prestellar cores to the stellar IMF: Initial highlights from the Herschel Gould Belt survey
• Trigonometric Parallaxes of High Mass Star Forming Regions: the Structure and Kinematics of the Milky Way
• Clouds, filaments and protostars: the Herschel Hi-GAL Milky Way
• Characterizing interstellar filaments with Herschel in IC5146
• The persistent cosmic web and its filamentary structure I: Theory and implementation
• Herschel view of the Taurus B211/3 filament and striations: Evidence of filamentary growth?
• Filamentary structure of star-forming complexes
• Large-Scale Structure of the Molecular Gas in Taurus Revealed by High Linear Dynamic Range Spectral Line Mapping
• A Three-Dimensional Map of Milky-Way Dust
• The Distance to the Perseus Spiral Arm in the Milky Way
• Helical Fields and Filamentary Molecular Clouds
• The initial conditions of stellar protocluster formation. I. A catalogue of Spitzer dark clouds
• The Turbulent Shock Origin of Proto--Stellar Cores
• The persistent cosmic web and its filamentary structure II: Illustrations
• Filamentary structures and compact objects in the Aquila and Polaris clouds observed by Herschel
• Filaments and ridges in Vela C revealed by Herschel: from low-mass to high-mass star-forming sites
• Formation of Massive Molecular Cloud Cores by Cloud-cloud Collision
• The "Nessie" Nebula: Cluster Formation in a Filamentary Infrared Dark Cloud
• A Classification Scheme for Young Stellar Objects Using the WIDE-FIELD INFRARED SURVEY EXPLORER AllWISE Catalog: Revealing Low-Density Star Formation in the Outer Galaxy
• A census of dense cores in the Aquila cloud complex: SPIRE/PACS observations from the Herschel Gould Belt survey
• Physical properties of interstellar filaments
• Formation and evolution of interstellar filaments; Hints from velocity dispersion measurements
• The Herschel first look at protostars in the Aquila Rift
• The seeds of star formation in the filamentary infrared-dark cloud G011.11-0.12
• The Search for Faint Radio Supernova Remnants in the Outer Galaxy: Five New Discoveries
• Molecular Clouds in the North American and Pelican Nebulae: Structures
• The Coalsack near and far
• Discovery of a new supernova remnant G150.3+4.5
• CO Core Candidates in the Gemini Molecular Cloud

Cited by in corpus (14)

• The Milky Way Imaging Scroll Painting (MWISP): Project Details and Initial Results from the Galactic Longitude of 25.8deg to 49.7deg
• Star-forming content of the giant molecular filaments in the Milky Way
• The Serpens filament: at the onset of slightly supercritical collapse
• Local Molecular Gas toward the Aquila Rift Region
• 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
• Searching for Molecular Outflows with Support Vector Machines: Dark Cloud Complex in Cygnus
• Dynamical origin of non-thermal states in galactic filaments
• A wide-field CO survey towards the California Molecular Filament
• The discovery of the largest gas filament in our Galaxy, or a new spiral arm?
• CO~($J=1-0$) Observations toward Filamentary Molecular Clouds in the Galactic Region with $l = [169\arcdeg.75, 174\arcdeg.75], b = [-0\arcdeg.75, 0\arcdeg.5]$
• Different molecular filament widths as tracers of accretion onto filaments
• Large-field CO (J=1-0) observations toward SNR G150.3+4.5
• Symmetry properties and widths of the filamentary structures in the Orion A giant molecular cloud
• Molecular Clouds Associated with {H \small{II}} regions and Candidates within l = 106.65${}^{\circ }$ to 109.50${}^{\circ }$ and b = $-$1.85${}^{\circ }$ to 0.95${}^{\circ }$