Further monitoring of the structure of superluminal radio sources

Journal Article · Sun Apr 01 04:00:00 EST 1979 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/156929· OSTI ID:6217143

Seielstad, G A; Cohen, M H; Linfield, R P; Moffet, A T; Romney, J D; Schilizzi, R T; Shaffer, D B

We have studied the sources 3C 120, 3C 273, 3C 279, and 3C 345 at six epochs between 1975.40 and 1977.13 using long baseline interferometry at 10.65 GHz, and at 1976.52 and 1977.41 at 5.01 GHz. The sources 3C 120 (usually) and 3C 345 (always) appear as double radio sources whose components are separating along constant potition angles. Assuming their redshifts are cosmological, the apparent transverse velocities of separation are v/c=6.7 +- 0.8 beginning in 1966.3 +- 0.3 yr for 3C 345 and, for 3C 120, v/c=4.1 +- 0.4 beginning in 1972.4 +- 0.5 yr and continuing into 1974, then v/c=8.5 +- 0.9 beginning in 1974.4 +- 0.2 yr and continuing until mid-1976. No models of 3C 273 are derived, but evidence for superluminal expansion is presented, showing v/c=5.2 +- 0.5 beginning in 1967.6 +- 0.4 yr. Visibility functions of 3C 279 have changed very little over the period 1976.39 +- 1977.41.

• Research Organization: Owens Valley Radio Observatory, California Institute of Technology
• OSTI ID: 6217143
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 229:1; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640103* -- Astrophysics & Cosmology-- Quasi-Stellar
Radio
& X-Ray Sources-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
ENERGY SPECTRA
INTERFEROMETRY
QUASARS
RADIATIONS
RADIOWAVE RADIATION
SPECTRA
VARIATIONS