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Magnetic Fields in Dark Cloud Cores and H2O Masers

Published online by Cambridge University Press:  19 July 2016

Rolf Güsten  and
Dirk Fiebig
Rolf Güsten
Affiliation:
Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 53 Bonn 1, F.R.G.
Dirk Fiebig
Affiliation:
Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 53 Bonn 1, F.R.G.

Abstract

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We present results of recent circular polarization experiments with the MPIfR 100-m telescope, revealing for the first time, the magnetic field strength towards interstellar H2O masers and the dense cores of local dark cloud complexes. Weak Zeeman splittings of a few 10 kHz only in the 22.235 GHz maser transition of the non-paramagnetic H2O molecule imply magnetic field strengths of ~ 50 mG in the dense (n ~ 1010 cm−3) masing layer. With the recently identified CCS radical it became possible to study the magnetic field associated with dense (~ 105 cm−3) dark cloud cores, the potential sites of future star formation. We report the detection of a −110μG field towards TMC-1C, a low-mass core associated with the Taurus Molecular Cloud. From complementary gas density and kinetic temperature probing measurements, we derive approximate equipartition between magnetic, gravitational and thermal energy for this clump.

Type
6. Magnetic Fields in Molecular Clouds, Dark Globules and in the Pre-Stellar and Circumstellar Environment
Information
Symposium - International Astronomical Union , Volume 140: Galactic and Intergalactic Magnetic Fields , 1990 , pp. 305 - 308
Copyright
Copyright © Kluwer 1990 

References

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