Excess rotation measure and large-scale magnetic field in the Scutum spiral arm of our Galaxy

Details Excess rotation measure and large-scale magnetic field in the Scutum spiral arm of our Galaxy Excess rotation measure and large-scale magnetic field in the Scutum spiral arm of our Galaxy

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...331..321v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 331, Aug. 1, 1988, p. 321-324.

Astronomy and Astrophysics

Astrophysics

22

Extragalactic Radio Sources, Galactic Rotation, Magnetic Field Configurations, Milky Way Galaxy, Scutum Constellation, Spiral Galaxies, Faraday Effect, Quasars, Sagittarius Constellation

Scientific paper

The authors present improved rotation measures (RMs) for several extragalactic radio sources seen through and to the sides of the Scutum spiral arm. From these, they obtain a first clear detection of excess RM attributable to the Scutum spiral arm's magnetic field. The magnetic field lines are clockwise as viewed from the north pole of our Galaxy; thus they are opposite to the anticlockwise field lines in the Sagittarius spiral arm. The deduced magnetic field intensity in the Scutum arm is 2±1 μG for the uniform (circular) component of the total magnetic field.

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