Periodicity in the BL Lac object OJ287

Details Periodicity in the BL Lac object OJ287 Periodicity in the BL Lac object OJ287

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.314..146c&link_type=abstract

Nature (ISSN 0028-0836), vol. 314, March 14, 1985, p. 146-148.

Astronomy and Astrophysics

Astronomy

64

Bl Lacertae Objects, Blazars, Periodic Variations, Variable Stars, Accretion Disks, Active Galactic Nuclei, Black Holes (Astronomy), Light Curve, Power Spectra

Scientific paper

Short-term variations in luminosity provide the best upper limits for the sizes of active galactic nuclei. Periodicity provides further information on the geometrical, dynamical, and physical models of these regions. The best candidates for the study of such variations are the so-called blazars (optically violently variable /OVV/ objects and BL Lac objects). Photometric observations of OJ287 are presented which reveal periodic variability in timescales of a few minutes. It is concluded that the results are compatible with the presence of 'hotspots' in a thick accretion disk spiraling into a Kerr's supermassive black hole and that the central source is seen nearly pole-on.

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