English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Recent intensive observations of the BL Lac object OJ 287 raise a lot ofquestions on the models of binary black holes, processing jets, rotatinghelical jets and thermal instability of slim accretion disks. After carefullyanalyzing their radio flux and polarization data, Valtaoja et al.(\cite{valtaoja00}) propose a new binary model. Based on the black hole mass of$4 \times 10^8 {\rm M_\odot}$ estimated with the tight correlations of theblack hole masses and the bulge luminosity or central velocity dispersion ofhost galaxies, we computed the physical parameters of the new binary scenario.The impact of the secondary on the accretion disk around the primary black holecauses strong shocks propagating inwards and outwards, whose arrival at the jetroots is identified with the rapid increase of optical polarization and thelarge change of polarization angle at about 0.30 yr after the first mainoptical flare. An increase of optical polarization, a large rotation ofpositional angle and a small synchrotron flare at 2007.05 between the opticaloutbursts at 2006.75 and 2007.89 are expected by the model. With the estimatedparameters, we predicated an increase of $\gamma$-ray flux appearing about 5days after the first optical/IR peak, which is consistent with the EGRETobservations.Comment: 5 pages, no figur

Black hole mass and binary model for BL Lac object OJ 287