Optical monitoring of the superluminal quasar 3C 345 in 1984-1991

Details Optical monitoring of the superluminal quasar 3C 345 in 1984-1991 Optical monitoring of the superluminal quasar 3C 345 in 1984-1991

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995azh....72..447b&link_type=abstract

Astronomicheskij Zhurnal, vol. 72, p. 447

Astronomy and Astrophysics

Astronomy

8

Quasars, Light Curve, Luminosity, Blazars, Brightness Distribution, Radio Jets (Astronomy), Tables (Data), Variability, Optical Properties

Scientific paper

This article continues a series of publications containing results of a program of optical monitoring of OVV quasars, blazars, and similar objects (the Petersburg Quasar Monitoring Program), which has been conducted at the Byurakan station of the St. Petersburg Astronomical Institute since 1968. Results of long-term monitoring of the quasar 3C 345 in 1984-1991 are presented. The observations were conducted in the B band and consist of 365 brightness estimates obtained on 219 nights. The optical variability of 3C 345 on time scales from tens of years to tens of minutes is discussed. In 1991, the appearance of a new large amplitude slow outburst is noted (the characteristic time for brightness variation is of the order of a year). This outburst is similar to outbursts in 1967-1968, 1970-1972, 1976-1977, and 1982-1983, which were associated with the emergence of superluminal components in the milliarcsecond radio jet of 3C 345. The 1991 outburst suggests the emergence from the core of a new superluminal component. Analysis of the full known optical brightness curve for 3C 345 (1965-1993) shows the possible existence of a (quasi-)period of 700 days, which implies the appearance of a new brightness maximum in the 1994 observing season.

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