Aperture synthesis observations of the 21 CM Zeeman effect

Details Aperture synthesis observations of the 21 CM Zeeman effect Aperture synthesis observations of the 21 CM Zeeman effect

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...118..157b&link_type=abstract

Astronomy and Astrophysics, vol. 118, no. 1, Feb. 1983, p. 157-162.

Astronomy and Astrophysics

Astronomy

15

Hydrogen Clouds, Interstellar Magnetic Fields, Magnetic Field Configurations, Synthetic Apertures, Zeeman Effect, Absorption Spectra, Astronomical Maps, Line Spectra, Radio Astronomy, Spatial Resolution

Scientific paper

The first applications of aperture synthesis techniques to measurement of the Zeeman effect is described. The technique has been used to study the spatial structure of the magnetic field embedded within the Cas A Perseus Arm H I absorbing region. Galactic H I absorbing clouds have been observed along the lines-of-sight to two unresolved continuum sources, 3C123 and 3C147. It is found that the line-of-sight field is nearly uniform across the projected face of the source with the possible exception of a weak east-west gradient in the line component centered at about -37 km/s. This gradient runs counter to that of H I optical depths and CO line strengths. Upper limits have been set of 16 and 35 micro-G for galactic H I absorption lines in the spectra of the unresolved sources 3C123 and 3C147.

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