Magnetic field in the Andromeda Nebula inferred from polarization observations

Details Magnetic field in the Andromeda Nebula inferred from polarization observations Magnetic field in the Andromeda Nebula inferred from polarization observations

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...230..284r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 230, no. 2, April 1990, p. 284-292.

Astronomy and Astrophysics

Astrophysics

23

Andromeda Galaxy, Interstellar Magnetic Fields, Nebulae, Polarized Radiation, Radio Emission, Data Processing, Magnetic Field Configurations, Polarization Characteristics, Spiral Galaxies

Scientific paper

A method of pattern recognition intended primarily to determine the configuration of large-scale magnetic fields in external galaxies is proposed. Single-frequency polarization observations of M31 are analyzed to determine parameters of the large-scale magnetic field in this galaxy. In the inner part of the magnetic ring in M31, for r in the range of 7-10 kpc deviations of the magnetic field configuration from axial symmetry are noticeable at the 95 percent confidence level. The basic axisymmetric component of the field can be distorted either by the north-south asymmetry of the disk of M31, revealed earlier in distributions of other constituents of the interstellar medium, or by the spiral pattern; other possible explanations of apparent deviations from axial symmetry are also proposed. In the outer parts of M31 a purely axisymmetric field distribution is consistent with the available observational data.

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