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Spectrum of the Intensity Variations in 3C 273B

Maltby, P. and Moffett, A. T. (1965) Spectrum of the Intensity Variations in 3C 273B. Science, 150 (3692). pp. 63-64. ISSN 0036-8075. doi:10.1126/science.150.3692.63.

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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.

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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.
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Office of Naval Research (ONR)Nonr 220(19)
Alfred P. Sloan FoundationUNSPECIFIED
Issue or Number:3692
Record Number:CaltechAUTHORS:20151211-154210197
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Official Citation:Spectrum of the Intensity Variations in 3C 273B P. Maltby and A. T. Moffett Science 1 October 1965: 150 (3692), 63-64. [DOI:10.1126/science.150.3692.63]
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62829
Deposited On:11 Dec 2015 23:57
Last Modified:10 Nov 2021 23:07

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