New Rotation Measures of Distant Pulsars in the Inner Galaxy and Magnetic Field Reversals

Details New Rotation Measures of Distant Pulsars in the Inner Galaxy and Magnetic Field Reversals New Rotation Measures of Distant Pulsars in the Inner Galaxy and Magnetic Field Reversals

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.268..497r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 268, NO. 2/MAY15, P. 497, 1994

Astronomy and Astrophysics

Astronomy

125

Pulsars: General - Ism: Magnetic Fields - Galaxy: Structure

Scientific paper

We present new rotation measures (RMs) for 27 pulsars, most of which were discovered in searches by Clifton & Lyne and Clifton et al. These pulsars have generally high dispersion measures and low Galactic latitudes, and are located in the first quadrant of the Galaxy. The new RMs, considered together with existing RMs in the same directions, provide further evidence that the large-scale Galactic magnetic field along the Sagittarius arm is opposite in direction from the local field. We have run models used by Rand & Kulkarni, but with a more careful selection of the data, to find that the field changes direction at about 0.4 kpc inside the solar circle, locally points to Galactic longitude 88°, and has a strength of 1.4 μG. These RMs also provide evidence for a second reversal of the magnetic field direction in the inner Galaxy at a radius of 5.5 kpc, with a much stronger field beyond the reversal. The primary signature of this reversal is a systematic segregation of positive and negative RMs by distance and longitude in the region 0°

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