Optical Variations in 3C 345

Vlba Monitoring of the Qso 3c 345

The Host Galaxies of Three Radio-loud Quasars: 3c 48, 3c 345, and B2 1425]2671 Sofia Kirhakos

Observations with the Wide-Field/Planetary Camera-2 of the Hubble Space T elescope are presented for three radio-loud quasars : 3C 48 (z\ 0.367), B2 1425]267 (z\ 0.366), and 3C 345 (z\ 0.594). All three quasars have luminous (D4 ] L*) galaxies as hosts, which are either elliptical (B2 1425]267 and 3C345) or interacting (3C 48), and all hosts are 0.5È1.0 mag bluer in V [I than other galaxies wit...

A and a Manuscript-nr. a Helical Model for the Compact Jet in 3c 345

We present a simple model for the apparent superluminal motion along curved trajectories of features observed in the compact radio jet of the quasar 3C 345. The model is inspired by the magneto-hydrodynamic approach of Camenzind (1986), and assumes a conical geometry of the jet within about three milliarcseconds of the radio core. Simultaneous conservation of three out of four physical paramete...

A historical light curve of 3C 345 and its periodic analysis

All data in the B band for quasar 3C 345 have been compiled into a light curve from twenty one publications, dating back to 1896; 1642 values are available. The light curve shows that 3C 345 is very active and exhibits very complicated nonsinusoidal variations. Using this data we have found a period of 10.1±0.8 years (or 21.8±1.5 years) for the outbursts in 3C 345. This value is in good agreeme...

A supermassive binary black hole in the quasar 3 C 345

Radio loud active galactic nuclei present a remarkable variety of signs indicating the presence of periodical processes possibly originating in binary systems of supermassive black holes, in which orbital motion and precession are ultimately responsible for the observed broad-band emission variations, as well as for the morphological and kinematic properties of the radio emission on parsec scal...