Anchoring Magnetic Field in Turbulent Molecular Clouds

Abstract

One of the key problems in star formation research is to determine the role of magnetic fields. Starting from the atomic inter-cloud medium (ICM) which has density nH ~ 1 per cubic cm, gas must accumulate from a volume several hundred pc across in order to form a typical molecular cloud. Star formation usually occurs in cloud cores, which have linear sizes below 1 pc and densities nH2 > 10^5 per cubic cm. With current technologies, it is hard to probe magnetic fields at scales lying between the accumulation length and the size of cloud cores, a range corresponds to many levels of turbulent eddy cascade, and many orders of magnitude of density amplification. For field directions detected from the two extremes, however, we show here that a significant correlation is found. Comparing this result with molecular cloud simulations, only the sub-Alfvenic cases result in field orientations consistent with our observations.

accepted by ApJ

References in corpus (11)

• Theory of Star Formation
• Magnetic Fields in the Formation of Sun-Like Stars
• Magnetic Fields in Dark Cloud Cores: Arecibo OH Zeeman Observations
• Studies of regular and random magnetic fields in the ISM: statistics of polarization vectors and the Chandrasekhar-Fermi technique
• The effect of magnetic fields on star cluster formation
• Magnetic fields in massive star forming regions
• Results of SPARO 2003: Mapping Magnetic Fields in Giant Molecular Clouds
• The Galactic distribution of magnetic fields in molecular clouds and HII regions
• The cooling of atomic and molecular gas in DR21
• Comparison of Magnetic Field Structures on Different Scales in and around the Filamentary Dark Cloud GF 9
• Dispersion of Observed Position Angles of Submillimeter Polarization in Molecular Clouds

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