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Radio polarization observations of large supernova remnants at λ6 cm

Published online by Cambridge University Press:  29 January 2014

J. L. Han ,
X. Y. Gao ,
X. H. Sun ,
W. Reich ,
L. Xiao ,
P. Reich ,
J. W. Xu ,
W. B. Shi ,
E. Fürst  and
R. Wielebinski
J. L. Han
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Jia-20 Datun Road, Chaoyang District, Beijing 100012, China. hjl@nao.cas.cn
X. Y. Gao
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Jia-20 Datun Road, Chaoyang District, Beijing 100012, China. hjl@nao.cas.cn
X. H. Sun
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Jia-20 Datun Road, Chaoyang District, Beijing 100012, China. hjl@nao.cas.cn Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
W. Reich
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
L. Xiao
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Jia-20 Datun Road, Chaoyang District, Beijing 100012, China. hjl@nao.cas.cn
P. Reich
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
J. W. Xu
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Jia-20 Datun Road, Chaoyang District, Beijing 100012, China. hjl@nao.cas.cn
W. B. Shi
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Jia-20 Datun Road, Chaoyang District, Beijing 100012, China. hjl@nao.cas.cn
E. Fürst
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
R. Wielebinski
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
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Abstract

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We have observed 79 supernova remnants (SNRs) with the Urumqi 25 m telescope at λ6 cm during the Sino-German λ6 cm polarization survey of the Galactic plane. We measured flux densities of SNRs at λ6 cm, some of which are the first ever measured or the measurements at the highest frequency, so that we can determine or improve spectra of SNRs. Our observations have ruled out spectral breaks or spectral flattening that were suggested for a few SNRs, and confirmed the spectral break of S147. By combining our λ6 cm maps with λ11 cm and λ21 cm maps from the Effelsberg 100 m telescope, we calculated the spectral index maps of several large SNRs. For many remnants we obtained for the first time polarization images, which show the intrinsic magnetic field structures at λ6 cm. We disapproved three objects as being SNRs, OA184, G192.8−1.1 and G16.8−1.1, which show a thermal spectrum and no polarization. We have discovered two large supernova remnants, G178.2−4.2 and G25.1−2.3., in the survey maps.

Keywords

supernova remnantspolarizationradio continuum: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S296: Supernova Environmental Impacts , January 2013 , pp. 202 - 209
Copyright
Copyright © International Astronomical Union 2014 

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