Galactic Center Arc--Polarized Plumes Complex at 43 GHz

Details Galactic Center Arc--Polarized Plumes Complex at 43 GHz Galactic Center Arc--Polarized Plumes Complex at 43 GHz

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasj...47..829t&link_type=abstract

Publications of the Astronomical Society of Japan, v.47, p.829-836.

Astronomy and Astrophysics

Astronomy

15

Galaxies: Active, Galaxies: Magnetic Fields, Galaxies: Milky Way, Instruments, Polarization

Scientific paper

We observed the distribution of the Stokes I parameter and the linear polarization in the Galactic Center Arc--Polarized Plumes Complex region at 42.5 GHz with a newly developed 40-GHz band polarimeter equipped on the Nobeyama 45-m telescope. The Galactic Center Arc at 42.5 GHz is highly polarized up to p =50%. The magnetic fields with a 120('') resolution in the Galactic Center Arc are well ordered and are generally along the Vertical Filaments. The spectral indices between 10 and 42.5 GHz gradually become steeper going from the Galactic Center Arc to both Polarized Plumes, although the complex has a flat spectrum between 2.7 and 10 GHz. The relativistic electrons may be accelerated in the Galactic Center Arc and gradually drift along the poloidal magnetic field toward the Polarized Plumes with synchrotron-loss. The linear rotation of the polarization angle as the wavelength square and the depolarization properties between 10 and 42.5 GHz suggest a large internal Faraday rotation, RM= -3000 rad m(-2) , in the Galactic Center Arc.

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