Optical monitoring of the superluminal quasar 3C345 from 1984 to 1991

Details Optical monitoring of the superluminal quasar 3C345 from 1984 to 1991 Optical monitoring of the superluminal quasar 3C345 from 1984 to 1991

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995arep...39..393b&link_type=abstract

Astronomy Reports, Volume 39, Issue 4, July 1995, pp.393-401

Astronomy and Astrophysics

Astronomy

4

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 on the Byurakanskii station of the St. Petersburg Astronomical Institute since 1968. Results of long-term monitoring of the quasar 3C345 from 1984 to 1991 are presented. The observations were conducted in the B bad, and consist of 365 brightness estimates obtained over the course of 219 nights. The character of the optical variability of 3C345 on time scales from tens of years to tens of minutes is discussed. In 1991, the appearance of a new large amplitude s(slow)outburst is noted (the characteristic time for brightness variation is of order a year). This outburst is similar to outbursts in 1967 to 1968, 1970 to 1972, 1976 to 1977, and 1982 to 1983, which were associated with the emergence of superluminal components in the milliarcsecond radio jet of 3C345. The 1991 outburst suggests the emergence from the core of a new superluminal component. Analysis of the full known optical brightness curve for 3C345 (1965 to 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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