An Attempt to detect Linearly Polarized Radio Emmision from the Galaxy

Details An Attempt to detect Linearly Polarized Radio Emmision from the Galaxy An Attempt to detect Linearly Polarized Radio Emmision from the Galaxy

Sep 1957

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1957natur.180..495t&link_type=abstract

Nature, Volume 180, Issue 4584, pp. 495-496 (1957).

Physics

10

Scientific paper

SEVERAL authors1,2 have suggested that synchrotron radiation by relativistic electrons in galactic magnetic fields may be responsible for part of the galactic background radiation at radio-frequencies. Radiation so produced is linearly polarized in a direction perpendicular to the magnetic field. The actual polarization observed from an extended region is likely to be reduced due to a number of mechanisms3,4 which will be discussed elsewhere, but a small percentage might remain. Razin5 has described an attempt to measure this polarization by a method based on the suggestion that the Faraday effect in interstellar space would make the angular position of the plane of polarization strongly dependent upon frequency. By switching between a wide and a narrow receiver band-width, a change of output was noted which was interpreted as implying the presence of up to 4 per cent of linear polarization in some directions. On present evidence, the magnitude of the galactic magnetic field and of the electron density in interstellar space4 are thought insufficient for this dependence on frequency to lead to a reliable method of measurement, and a different procedure has been adopted. In the present method, a receiver band-width of 4 Mc./s. has been used, and although in certain circumstances the wider band-width might lead to a reduction of the polarization observed, the sensitivity is much improved, particularly when observing in directions away from the galactic plane.

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