Investigation of the linear polarization of the radio emission of the North Polar Spur at wavelength 31 CM with high resolution

Details Investigation of the linear polarization of the radio emission of the North Polar Spur at wavelength 31 CM with high resolution Investigation of the linear polarization of the radio emission of the North Polar Spur at wavelength 31 CM with high resolution

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995azh....72..674v&link_type=abstract

Astronomicheskij Zhurnal, vol. 72, p. 674

Astronomy and Astrophysics

Astronomy

Radio Emission, Linear Polarization, Radio Telescopes, Angular Resolution, Brightness Temperature, Interstellar Magnetic Fields, High Resolution, Polar Regions, Synchrotron Radiation, Relativistic Electron Beams, X Ray Astronomy

Scientific paper

Measurements of the linear polarization of the North Polar Spur along a declination of 14 deg were carried out using the RATAN-600 radio telescope at a frequency of 960 MHz, with a resulting angular resolution 4.5 min x 2.5 deg. A jump-like increase in the polarization position angle by 90 deg with zero brightness temperature was observed at alpha-1950 = 16 h 48 m. This is another manifestation of a virtually uniform magnetic field in the North Polar Spur, at least at Galactic latitudes greater than 30 deg. Using the results of polarization measurements at 910 MHz with a 10-m radio telescope together with a brightness temperature measurement for the polarized component at 1407 MHz, the spectral index for the synchrotron radiation was determined. Sharp steepening of the spectrum at decimeter wavelengths is evidence of a corresponding deficit of relativistic electrons with energies above 3 GeV. Physical parameters for a two-component model for Loop 1 were determined using the available observational data at radio, optical, X-ray, and T-ray wavelengths. It is shown that this extended supernova remnant consists of 80 percent by volume of hot rarified gas radiating at soft X-ray wavelengths and 20 percent of clouds of thermal ionized gas extended along a highly order magnetic field radiating at radio and gamma-ray wavelengths and giving rise to the observed emission and dispersion measures.

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