Interstellar Origin of Cosmic Radiation at Radio-Frequencies

Details Interstellar Origin of Cosmic Radiation at Radio-Frequencies Interstellar Origin of Cosmic Radiation at Radio-Frequencies

Jun 1946

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1946natur.157..805g&link_type=abstract

Nature, Volume 157, Issue 3998, pp. 805-806 (1946).

Astronomy and Astrophysics

Astronomy

7

Scientific paper

RECENT publications of measurements of radiation from interstellar space1 and from the sun2,3 have important astronomical consequences. In the measurement of cosmic radiations at 5 metres wave-length, the maximum value of 13.2 × 10-21 Δ v Δω watts/sq. metre was obtained. This is equivalent to a radiation intensity of 4 × 10-18 ergs/sec./kilocycle band-width/sq. cm./sq. degree. We have previously investigated4 the theory of interstellar radiation arising from free-free transitions by electrons in the field of protons. From astronomical observations the numbers of protons and electrons in interstellar space, in the neighbourhood of the sun, are known to be of the order of 1 per cubic centimetre. On this basis we computed the expected intensity of radiation at the earth; the maximum predicted value is found to be 5 × 10-18 ergs/sec./kc./sq.cm./sq. degree, at about 1 metre wave-length. The accompanying graph shows the predicted free-free radiation from interstellar space as well as the presently available high-frequency measures. The plotted observations are the observed maximum intensities, in the region of Sagittarius. Data at the slightly longer wave-length bands, near 10 metres, would be of critical importance. The new and accurate observations by Hey, Phillips, and Parsons1 lie remarkably close to our predicted curve. Their observations show relatively low concentration of the radio-frequency radiation to the galactic plane, compared to both interstellar matter and stars. Possibly a slight under-estimation of background noise might explain this effect.

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