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Time-dependent radio fine structure of the compact sources NRAO 150 and 4C 39.25Very long baseline interferometer observations at 7.85 GHz have been used to probe the milliarcsecond structure of the unidentified, very compact radio source NRAO 150 and QSO 4 C 39.25. NRAO 150 exhibited no structural variations from 1972 to the end of 1974. A model with two circular Gaussian components fits the data well. NRAO 150 had a flux density of 7.6 plus or minus 0.5 Jy in the compact component; 4 C 39.25 showed a two-component structure, the components having a separation of (2.02 plus or minus 0.05 arc sec) x 10 to the -3rd power. The upper bound on the speed of transverse separation is 0.0001 arc sec per year or less than 2.7 c. From the spectrum there are also indications of a third, larger component.
Document ID
19800056852
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Baath, L. B.
(Onsala Space Observatory Goteborg, Sweden)
Cotton, W. D.
(Onsala Space Observatory Sweden)
Counselman, C. C.
(Onsala Space Observatory Sweden)
Shapiro, I. I.
(Onsala Space Observatory Sweden)
Wittels, J. J.
(MIT Cambridge, Mass., United States)
Hinteregger, H. F.
(Onsala Space Observatory Sweden)
Knight, C. A.
(Onsala Space Observatory Sweden)
Rogers, A. E. E.
(Onsala Space Observatory Sweden)
Whitney, A. R.
(Haystack Observatory Westford, Mass., United States)
Clark, T. A.
(NASA Goddard Space Flight Center Greenbelt, Md., United States)
Date Acquired
August 10, 2013
Publication Date
June 1, 1980
Publication Information
Publication: Astronomy and Astrophysics
Volume: 86
Issue: 3, Ju
Subject Category
Astrophysics
Accession Number
80A41022
Funding Number(s)
CONTRACT_GRANT: NGR-22-009-839
CONTRACT_GRANT: NSF DES-74-22712
CONTRACT_GRANT: NSF MPS-71-02109-A07
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Other

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