The filamentary structures in the CO emission toward the Milky Way disk

Abstract

We present a statistical study of the filamentary structure orientation in the CO emission observations obtained in the Milky Way Imaging Scroll Painting (MWISP) survey in the range $25.8°<l<49.7°$, $|b|\le 1.25°$, and $-100<v_{\mathrm{LSR}}<135$ km/s. We found that most of the filamentary structures in the ${}^{12}$CO and ${}^{13}$CO emission do not show a global preferential orientation either parallel or perpendicular to the Galactic plane. However, we found ranges in Galactic longitude and radial velocity where the ${}^{12}$CO and ${}^{13}$CO filamentary structures are parallel to the Galactic plane. These preferential orientations are different from those found for the HI emission. We consider this an indication that the molecular structures do not simply inherit these properties from parental atomic clouds. Instead, they are shaped by local physical conditions, such as stellar feedback, magnetic fields, and Galactic spiral shocks.

Accepted for publication in Astronomy & Astrophysics (7 pages, 7 figures). arXiv admin note: text overlap with arXiv:2007.07285

References in corpus (19)

• The Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey
• Physical properties of molecular clouds for the entire Milky Way disk
• The Vertical Structure of the Outer Milky Way HI Disk
• FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45-m telescope (FUGIN) I: Project Overview and Initial Results
• The Milky Way Imaging Scroll Painting (MWISP): Project Details and Initial Results from the Galactic Longitude of 25.8deg to 49.7deg
• Large-scale filaments associated with Milky Way spiral arms
• The Bones of the Milky Way
• The identification of filaments on far infrared and submillimiter images. Morphology, physical conditions and relation with star formation of filamentary structure
• The molecular cloud lifecycle
• Simulations of magnetized multiphase galactic disk regulated by supernovae explosions
• The Cloud Factory I: Generating resolved filamentary molecular clouds from galactic-scale forces
• Simulations of the star-forming molecular gas in an interacting M51-like galaxy
• An application of an optimal statistic for characterising relative orientations
• From diffuse gas to dense molecular cloud cores
• The HI/OH/Recombination line survey of the inner Milky Way (THOR): data release 2 and HI overview
• Dynamical cloud formation traced by atomic and molecular gas
• Autonomous Gaussian decomposition of the Galactic Ring Survey. I. Global statistics and properties of the 13CO emission data
• The relative orientation between the magnetic field and gradients of surface brightness within thin velocity slices of 12CO and 13CO emission from the Taurus molecular cloud
• Atomic and molecular gas properties during cloud formation

Cited by in corpus (8)

• The Galactic dynamics revealed by the filamentary structure in atomic hydrogen emission
• Large-scale Velocity-coherent Filaments in the SEDIGISM Survey: Association with Spiral Arms and Fraction of Dense Gas
• The Stellar "Snake" I: Whole Structure and Properties
• HP2 Survey V. Ophiuchus: Filament formation in a dispersing cloud complex
• Bimodal orientation distribution and head-tail asymmetry of a sample of filamentary molecular clouds
• Cold atomic gas identified by HI self-absorption. Cold atomic clouds toward giant molecular filaments
• The Impact of Expanding HII Regions on Filament G37:Curved Magnetic Field and Multiple Direction Material Flows
• Anisotropy in the carbon monoxide (CO) line emission across the Milky Way's disk