Rotation measures of low-latitude extragalactic sources and the magnetoionic structure of the Galaxy

Details Rotation measures of low-latitude extragalactic sources and the magnetoionic structure of the Galaxy Rotation measures of low-latitude extragalactic sources and the magnetoionic structure of the Galaxy

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...386..143c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 386, Feb. 10, 1992, p. 143-157.

Astronomy and Astrophysics

Astrophysics

78

Extragalactic Radio Sources, Faraday Effect, Interstellar Magnetic Fields, Magnetoionics, Pulsars, Astronomical Models, Galactic Rotation, Milky Way Galaxy

Scientific paper

Faraday rotation measurements of 56 extragalactic sources obtained predominantly in the range 45-93 deg, /b/ less than 5 deg are reported. Within the longitude range sampled in the present study, RM(l) = 1600 sin (l0 - l) rad/sq m, with a null in RM occurring at 62 deg. Under the assumption of a uniform circular geometry for the magnetic field lines, it is argued that the magnetoionic medium must exist to a Galactocentric radius of about 25 kpc to produce the observed magnitudes of the RMs, where it is assumed that ne and /B/ equal their local values of 0.03/cu cm and 2.1 micro-G out to Rm. The medium must exist to an even greater radius if ne and/or /B/ decrease with R, as is likely. Comparison of extragalactic and pulsar RMs along nearly coincident lines of sight is consistent with at least one field reversal exterior to the radius of the solar orbit about the Galactic center.

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