First clear detection of the CCS Zeeman splitting toward the pre-stellar core, Taurus Molecular Cloud-1
arXiv:1908.07708 · doi:10.1093/pasj/psz102
Abstract
We report a first clear detection of the Zeeman splitting of a CCS emission line at 45 GHz toward a nearby prestellar dense filament, Taurus Molecular Cloud-1. We observed HCN non-Zeeman line simultaneously as the CCS line, and did not detect any significant splitting of HCN line. Thus, we conclude that our detection of the CCS Zeeman splitting is robust. The derived \textcolor{black}{line-of-sight} magnetic field strength is about 117 21 G, which corresponds to the normalized mass-to-magnetic flux ratio of 2.2 if we adopt the inclination angle of 45. Thus, we conclude that the TMC-1 filament is magnetically supercritical. Recent radiative transfer calculations of CCS and HCN lines along the line of sight suggest that the filament is collapsing with a speed of 0.6 km s, which is comparable to three times the isothermal sound speed. This infall velocity appears to be consistent with the evolution of a gravitationally-infalling core.
arXiv comment23 pages, 8 figures, PASJ in press
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Cited by in corpus (7)
- An Early Transition to Magnetic Supercriticality in Star Formation
- Carbon-Chain Chemistry in the Interstellar Medium
- Different Modes of Star Formation II: Gas Accretion Phase of Initially Subcritical Star-Forming Clouds
- Magnetic fields in star-forming systems (II): examining dust polarization, the Zeeman effect, and the Faraday rotation measure as magnetic field tracers
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