Abstract B-band measurements of 3C 273 over some 110 years are compiled and used in a search for periodicities using the Jurkevich method. Periods of 2.0, 13.65±0.20 and 22.5±0.2 yr are found. If the long-term periodicity is from the instability of a slim disk, then the periodicity (~ 13-yr or ~ 22-yr) suggests masses of 10 7 M⊙ for the central black holes.
Keywords Galaxies: active --- Galaxies: individual: 3C 273
It accepts original submissions from all over the world and is internationally published and distributed by IOP