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

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

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...337..342t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 337, Feb. 1, 1989, p. 342-354.

Astronomy and Astrophysics

Astrophysics

37

Interstellar Magnetic Fields, Orion Nebula, Synthetic Apertures, Zeeman Effect, Centimeter Waves, H I Regions, H Ii Regions, Interstellar Extinction, Very Large Array (Vla)

Scientific paper

The VLA has been used to map the 21 cm Zeeman effect at 40 arcsec resolution in the absorbing H I gas in front of Orion A. Two such regions exist having typical velocities of 1 and 5 km/s; both almost certainly lie close to the H II region. Field strengths exceed 100 micro G in this H I gas. The field in the higher velocity component has been reliably detected across most of the continuum source. No field reversals exist. The distribution of line-of-sight field strengths derived for this component mimics that of tau(H I) for positions where the lines are not saturated, suggesting that the mass-to-flux ratio in this gas is approximately constant. The distribution of visual extinction across Orion A using existing radio and optical data is rederived. Maxima and minima of extinction are generally coincident with maxima and minima of magnetic field. This correspondence suggests that the observed association between field strength and tau(H I) is a real column density effect, that the effect encompasses all neutral gas in front of the source, and that the mass-to-flux ratio for this neutral gas is approximately constant. Results for Orion A lend weight to the conclusion that magnetic fields play a crucial role in the dynamics of interstellar material.

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