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Published October 1, 1965 | public
Journal Article

Spectrum of the Intensity Variations in 3C 273B

Abstract

The intensity variations in radio source 3C 273B have been measured at wavelengths of 31.3, 21.2, and 10.6 centimeters. At 31.3 centimeters the variation is quite small, indicating that the variable component of the source is optically thick at this wavelength. Study of several different model sources shows that the observed dependence of the intensity variations on frequency can best be explained by an increase of the electron density in a source region about 2 parsecs in diameter. This interpretation is consistent with the distance to 3C 273 determined from Hubble's law and the observed red shift.

Additional Information

© 1965 American Association for the Advancement of Science. 21 July 1965. A detailed description of our observations and model calculations is in preparation. We thank E. B. Fomalont, D. H. Rogstad, J . B. Whiteoak, and J. D. Wyndham for permitting us to use their observations. Research supported by ONR contract Nonr 220(19). P.M. is on leave of absence from the Institute of Theoretical Astrophysics, Oslo, Norway; A.T.M. is an Alfred P. Sloan Research Fellow.

Additional details

Created:
August 19, 2023
Modified:
October 25, 2023