Observations of variable radio sources at 18-cm wavelength

Details Observations of variable radio sources at 18-cm wavelength Observations of variable radio sources at 18-cm wavelength

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976aj.....81.1069w&link_type=abstract

Astronomical Journal, vol. 81, Dec. 1976, p. 1069-1077.

Astronomy and Astrophysics

Astronomy

13

Extragalactic Radio Sources, Microwave Emission, Radio Astronomy, Continuous Radiation, Graphs (Charts), Periodic Variations, Radiant Flux Density

Scientific paper

A total of 42 extragalactic continuum radio sources having an extended component that is variable at meter wavelengths and a flux density greater than 1 Jy were monitored with a 37-m telescope for variability at a wavelength of 18 cm. The eight standard sources used for flux-density calibration are identified, and positions as well as minimum and maximum flux densities are given for the 42 investigated sources. Flux density is plotted as a function of time (in years) for three of the standard sources and all the monitored sources. The chi-squared probability of the null hypothesis that a given source is constant in flux density is calculated for each source. It is found that the eight standard sources show no variations and that 22 of the monitored sources exhibit evidence of variability.

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