Low frequency variability and interstellar focusing

Details Low frequency variability and interstellar focusing Low frequency variability and interstellar focusing

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.315...40c&link_type=abstract

Nature (ISSN 0028-0836), vol. 315, May 2, 1985, p. 40-42.

Astronomy and Astrophysics

Astronomy

22

Extragalactic Radio Sources, Interstellar Matter, Low Frequencies, Radio Astronomy, Flux (Rate), Focusing, Luminosity, Power Series, Root-Mean-Square Errors, Scintillation, Synchrotron Radiation

Scientific paper

It has been suggested recently that flux variations in extragalactic radio sources at low radio frequencies may be the result of a focusing effect of irregularities in the local interstellar medium. Evidence is presented here which suggests that, in accordance with this explanation, low-frequency variability is a more common feature of sources at low galactic latitudes. In a sample of radio sources monitored over a period of five years at Bologna, the mean galactic longitude of the variable sources is smaller than that of the nonvariables to an extent that would occur with a chance of only two percent were the two groups drawn from the same parent distribution.

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