Are there any compact extragalactic radio sources at low frequencies

Details Are there any compact extragalactic radio sources at low frequencies Are there any compact extragalactic radio sources at low frequencies

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.192...33d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 192, July 1980, p. 33-39.

Astronomy and Astrophysics

Astronomy

6

Extragalactic Radio Sources, Interplanetary Medium, Low Frequencies, Radio Astronomy, Scintillation, Diameters, Halos, High Resolution, Quasars, Radio Galaxies, Void Ratio

Scientific paper

Observations at 5 GHz with the 5-km telescope and a survey of 1492 radio sources at 81.5 MHz using the method of interplanetary scintillations (IPS) are discussed with regard to the possibility of an extended structure being associated with compact radio sources at low frequencies. Attention is given to calculating the angular diameter and the fraction (R) of the total flux density in the scintillating component for complex brightness distributions. It is concluded that a multiple-component model for any complexity cannot produce a value for R near 0.6 if all the radio power comes from within a diameter of about 0.4 arcsec. In addition, if the calibration of the interplanetary medium by Readhead and Hewish (1974) is correct, the measurements of compact sources at high frequencies and at 81.5 MHz by the IPS method therefore imply the presence of additional components which become significant at low frequencies.

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