A Precessing Disk in OJ 287?

Details A Precessing Disk in OJ 287? A Precessing Disk in OJ 287?

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...478..527k&link_type=abstract

Astrophysical Journal v.478, p.527

Astronomy and Astrophysics

Astronomy

84

Accretion, Accretion Disks, Galaxies: Bl Lacertae Objects: Individual Alphanumeric: Oj 287, Galaxies: Active, Galaxies: Individual Alphanumeric: Oj 287

Scientific paper

Sillanpaa et al. have demonstrated that the active galactic nucleus OJ 287 has intensity peaks that recur within a period of about 12 yr. I suggest that this is the result of the sweeping of a precessing relativistic beam across our line of sight. In analogy to Hercules X-1 and SS 433, precession is attributed to the torque exerted by a companion mass on an accretion disk. Secondary maxima observed 1.2 yr after two of these peaks may be evidence of nodding motion.

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