Continuous change in the structure of quasar 3C 273B observed by Japan-USA VLBI experiments 1986-1988

Details Continuous change in the structure of quasar 3C 273B observed by Japan-USA VLBI experiments 1986-1988 Continuous change in the structure of quasar 3C 273B observed by Japan-USA VLBI experiments 1986-1988

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44..575t&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 6, p. 575-584.

Astronomy and Astrophysics

Astronomy

1

Active Galaxies, Galactic Structure, Quasars, Very Long Base Interferometry, Radio Sources (Astronomy), Ultraviolet Astronomy

Scientific paper

The right ascension of 3C 273B is used as the reference position for a radio celestial coordinate system. This radio source was observed from 1984 to 1988 by the Japan-USA VLBI experiments under the Crustal Dynamics Project (CDP). The continuous change in the structure of quasar '3C 273B' is revealed by the variation of correlation amplitudes on the UV plane from these experiments. This analysis is characterized by the calibration of antenna sensitivity and atmospheric coherence loss by using the correlation amplitudes of pointlike reference source, the use of continual data, and the parameter estimation method. The key findings are as follows: (1) a subcomponent of 3C 273B had been moving at a rate of 0.88 mas/yr toward a position angle of -127 deg; (2) the expansion of the quasars center part, within 1 milliarcsec (mas), was periodically variable; (3) the size and flux density of the center part change for a period shorter than a year. The delays calculated using the estimated structure is qualitatively consistent with the observed ones.

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