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Radio and Polarization Properties in the Disk and Halo of Edge-On Spirals

Published online by Cambridge University Press:  12 April 2016

M. Dumke  and
M. Krause
M. Dumke
Affiliation:
Max–Planck–Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
M. Krause
Affiliation:
Max–Planck–Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany

Abstract

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We have observed a small sample of edge-on galaxies in total and linearly polarized radio continuum emission at λ6.2 cm, using the Effelsberg 100m telescope. The resulting maps were combined with available VLA data in order to obtain high-sensitivity radio images which have a sufficient angular resolution and do not suffer from the so-called missing-spacing problem.

From an analysis of these images (together with 2.8cm and 20cm data) we get the following results: 1. The radio emission perpendicular to the plane can be described by a two-component exponential distribution with scale-heights of ~ 300 pc and ~ 1.8 kpc, independently of the star forming activity and interaction state. 2. In the disk of the non-interacting galaxies of our sample the thermal fraction of the emission seems to be higher than usually deduced from observations of face-on galaxies. 3. The fractional polarization p increases with increasing galactic height, reaches a maximum at h ~ 1 – 3 kpc, and decreases again. In general p is lower in actively star forming galaxies.

Type
Part IX External Galaxies
Information
International Astronomical Union Colloquium , Volume 166: The Local Bubble and Beyond , 1997 , pp. 555 - 558
Copyright
Copyright © Springer-Verlag 1998

References

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