The Magnetic Fields in the Ophiuchus and Taurus Molecular Clouds

Details The Magnetic Fields in the Ophiuchus and Taurus Molecular Clouds The Magnetic Fields in the Ophiuchus and Taurus Molecular Clouds

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...471..302t&link_type=abstract

Astrophysical Journal v.471, p.302

Astronomy and Astrophysics

Astronomy

36

Ism: Clouds, Ism: Magnetic Fields, Ism: Molecules, Polarization, Stars: Formation, Ism: Individual Name: Rho Ophiuchi Cloud, Ism: Individual Name: Taurus Molecular Cloud

Scientific paper

We discuss the significance of previously published OH Zeeman effect measurements of the magnetic field in the ρ Oph cloud (L1688) and also a new OH Zeeman effect measurement for the dark cloud core TMC-1C, the latter obtained with the Arecibo telescope. Results for both of these clouds, like previously published OH Zeeman results for other dark clouds, show that the line-of-sight field strength |B||| I ≤ 10 jμG. The ρ Oph cloud is significantly higher in column density than other clouds studied, and recent H I Zeeman effect observations have revealed B|| ≍ +10 μG in the H I self-absorption region in front of the cloud. The low values of B|| derived from the OH Zeeman effect may indicate that OH poorly samples the dense gas in the ρ Oph cloud, or else that the cloud is in a state of supercritical collapse. The TMC-1C cloud core may have formed via ambipolar diffusion in a manner similar to recent modeling of dark cloud Barnard 1.

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