Magnetic stability of massive star forming clumps in RCW 106

Abstract

The RCW 106 molecular cloud complex is an active massive star-forming region where a ministarburst is taking place. We examined its magnetic structure by near-IR polarimetric observations with the imaging polarimeter SIRPOL on the IRSF 1.4 m telescope. The global magnetic field is nearly parallel to the direction of the Galactic plane and the cloud elongation. We derived the magnetic field strength of $\sim 100$-$1600\mu$G for 71 clumps with the Davis-Chandrasekhar-Fermi method. We also evaluated the magnetic stability of these clumps and found massive star-forming clumps tend to be magnetically unstable and gravitationally unstable. Therefore, we propose a new criterion to search for massive star-forming clumps. These details suggest that the process enhancing the clump density without an increase of the magnetic flux is essential for the formation of massive stars and the necessity for accreting mass along the magnetic field lines.

arXiv comment14 pages, 4 figures, accepted to ApJL

References in corpus (21)

• Gaia Data Release 2. Summary of the contents and survey properties
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Density, Velocity, and Magnetic Field Structure in Turbulent Molecular Cloud Models
• Structural Analysis of Molecular Clouds: Dendrograms
• The Aquila prestellar core population revealed by Herschel
• Dispersion of Magnetic Fields in Molecular Clouds. I
• The Efficiency of Grain Alignment in Dense Interstellar Clouds: A Reassessment of Constraints from Near Infrared Polarization
• The Magnetic Field in Taurus Probed by Infrared Polarization
• Embedded Stellar Clusters in the W3/W4/W5 Molecular Cloud Complex
• The Three-mm Ultimate Mopra Milky Way Survey. I. Survey Overview, Initial Data Releases, and First Results
• Grain Alignment in Starless Cores
• The Giant Molecular Cloud associated with RCW 106 -- A 1.2 mm continuum mapping study
• Molecular line mapping of the giant molecular cloud associated with RCW 106 - III. Multi-molecular line mapping
• Molecular line mapping of the giant molecular cloud associated with RCW 106 - II. Column density and dynamical state of the clumps
• Conversion Law of Infrared Luminosity to Star Formation Rate for Galaxies
• Simulating radiative feedback and star cluster formation in GMCs: I. Dependence on gravitational boundedness
• The scaling relations and star formation laws of ministarburst complexes
• H2, CO, and Dust Absorption through Cold Molecular Clouds
• Near-IR Imaging Polarimetry toward a Bright-Rimmed Cloud: Magnetic Field in SFO 74
• The Three-mm Ultimate Mopra Milky Way Survey. II. Cloud and Star Formation Near the Filamentary Ministarburst RCW 106
• Molecular line mapping of the giant molecular cloud associated with RCW 106 - IV. Ammonia towards dust emission

Cited by in corpus (3)

• HII regions and high-mass starless clump candidates I: Catalogs and properties
• The Role of Magnetic Fields in Triggered Star Formation of RCW 120
• High-Mass Starless Clumps: Dynamical State and Correlation Between Physical Parameters