Gaps and filaments in the synchrotron halo of M82 - Evidence for poloidal magnetic fields

Details Gaps and filaments in the synchrotron halo of M82 - Evidence for poloidal magnetic fields Gaps and filaments in the synchrotron halo of M82 - Evidence for poloidal magnetic fields

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...256...10r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 256, no. 1, p. 10-18.

Astronomy and Astrophysics

Astrophysics

43

Galactic Halos, Magnetic Field Configurations, Poloidal Flux, Starburst Galaxies, Astronomical Maps, Linear Polarization, Synchrotron Radiation

Scientific paper

We find clear evidence for a vertical magnetic field structure in the halo of M82. High resolution VLA maps at wavelengths of 90, 20, 6 and 3.6 cm have disclosed a complex morphology of the synchrotron halo encompassing the central starburst region of M82. The halo is characterized by a filamentary structure with prominent gaps located in between these filaments. All of these features exhibit a preferential orientation normal to the plane of M82, and extend out to z-distances of about 1 kpc. The most salient feature is an eye-catching synchrotron gap, which appears to be connected with a corresponding gap in the distribution of compact, nonthermal sources in the M82 nuclear region. The conditions for the existence of such filaments and gaps are discussed in the context of plasma convection along a vertical magnetic field into the M82 halo. The origin of the proposed large-scale bipolar field in M82 is discussed, juxtaposing the galactic dynamo and the bipolar wind model. The former is ruled out since the time scale to build up a dynamo is about 3 orders of magnitude larger than that for a wind-driven field.

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