Abstract
view Abstract Citations (54) References (14) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Effects of Magnetic Fields and Rotation on the Fragmentation of Filamentary Molecular Clouds: Comparison of the Theory with the Orion A Cloud Hanawa, Tomoyuki ; Nakamura, Fumitaka ; Matsumoto, Tomoaki ; Nakano, Takenori ; Tatematsu, Ken'ichi ; Umemoto, Tomofumi ; Kameya, Osamu ; Hirano, Naomi ; Hasegawa, Tetsuo ; Kaifu, Norio ; Yamamoto, Satoshi Abstract We discuss the fragmentation of a filamentary molecular cloud on the basis of a magnetohydrodynamical stability analysis and the observations of the Orion A cloud with the Nobeyama 45 m telescope. Our model cloud has axial and helical magnetic fields and rotates around the axis. The dispersion relation for this cloud shows that the presence of a magnetic field and/or rotation shortens the wavelength of the most unstable mode, i.e., the mean distance between the adjacent fragments, measured in units of the filament diameter. We compare the theoretical results with the observed clumpy structure of the filamentary Orion A cloud and find that the sum of magnetic and centrifugal forces in the parent cloud was comparable with the pressure force (thermal and turbulent) and has had significant effects on the fragmentation. The rotation velocity of the filament measured in the (C-13)O emission line is consistent with this result. Publication: The Astrophysical Journal Pub Date: February 1993 DOI: 10.1086/186749 Bibcode: 1993ApJ...404L..83H Keywords: Fragmentation; H Ii Regions; Interstellar Magnetic Fields; Magnetohydrodynamic Stability; Molecular Clouds; Rotation; Carbon Monoxide; Emission Spectra; Line Spectra; Astrophysics; HYDROMAGNETICS; INSTABILITIES; ISM: INDIVIDUAL NAME: ORION NEBULA; ISM: MAGNETIC FIELDS full text sources ADS | data products SIMBAD (2) Related Materials (1) Erratum: 1993ApJ...412L..75H
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