Aperture synthesis observations of the 21 centimeter Zeeman effect toward Cassiopeia A

Details Aperture synthesis observations of the 21 centimeter Zeeman effect toward Cassiopeia A Aperture synthesis observations of the 21 centimeter Zeeman effect toward Cassiopeia A

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...301..320s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 301, Feb. 1, 1986, p. 320-330. NSF-supported research.

Astronomy and Astrophysics

Astronomy

34

Cassiopeia Constellation, Interstellar Gas, Interstellar Magnetic Fields, Nebulae, Radio Sources (Astronomy), Supernova Remnants, Zeeman Effect, Astronomical Maps, Hydrogen Clouds, Molecular Clouds, Synthetic Apertures

Scientific paper

The Westerbork synthesis radio telescope has been used to perform an improved sensitivity study of the 21 cm H I Zeeman effect toward Cas A. Synthesis maps of the line-of-sight magnetic field strength are presented for velocities corresponding to the Perseus arm absorption features. Considerable spatial structure exists in these maps, with measured field strengths exceeding 40 micro-G at some positions in front of the source. No significant reversals in field direction are apparent. Peaks in magnetic field strength often coincide in position with clumps of molecular gas that appear in H2CO and in OH synthesis maps of Cas A. The magnetic field peaks arise in clumps of higher density H I gas that are associated with the molecular clumps. Thus, for the first time, an increase in magnetic field strength with interstellar gas density. Magnetic effects are likely to have an important influence upon the dynamics of the H I clumps and to a lesser extent upon the molecular clumps. High magnetic fields in the direction of Cas A may arise because the line of sight passes through, or close to, regions of star formation.

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