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Spectral Turn-Over of Radio Arc Filaments at 43 GHz: Magnetic Tubes of 4000-yr Old in the Galactic Center

Published online by Cambridge University Press:  12 April 2016

Yoshiaki Sofue ,
Yasuhiro Murata  and
Wolfgang Reich
Yoshiaki Sofue
Affiliation:
Institute of Astronomy, University of Tokyo, Mitaka, Tokyo 181, Japan
Yasuhiro Murata
Affiliation:
Nobeyama Radio Observatory, Minamisaku-gun, Nagano 384-13, Japan
Wolfgang Reich
Affiliation:
MPIfR, Auf dem Hügel 69, D-5300, Bonn 1, FRG

Extract

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The origin of the straight magnetic filaments in the Radio Arc near the Galactic Center is still controversial: either if they are permanent structure of constant configuration for a galactic-time scale, or they are temporary structure of short life time such as due to a sudden injection of cosmic rays or to sudden shock compression. Measurement of life time of the radio emitting cosmic ray electrons consisting the filaments is one of the crucial methods besides a time variation measurement of the fine structure of the filaments.

In order to investigate possible spatial variation of spectral index at higher frequencies in the filaments, which might give information about the life time of cosmic ray electrons, we have performed high-resolution radio continuum observations at 43 GHz of the GO.18-0.04 region of the radio Arc near the galactic center using the Nobeyama Millimeter-wave Array. A detailed description of this work is given in Sofue et al. (1992).

Type
3. Astronomical Results and Prospects
Information
International Astronomical Union Colloquium , Volume 140: Astronomy with Millimeter and Submillimeter Wave Interferometry , 1994 , pp. 166 - 167
Copyright
Copyright © Astronomical Society of the Pacific 1994

References

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