A quasi-periodic oscillation in the blazar J1359+4011
The Owens Valley Radio Observatory 40-m telescope has been monitoring the 15-GHz radio flux density of over 1200 blazars since 2008. The 15-GHz light curve of the flat spectrum radio quasar J1359+4011 shows a strong and persistent quasi-periodic oscillation. The time-scale of the oscillation varies between 120 and 150 d over an ∼4 year time span. We interpret this as the active galactic nucleus mass-scaled analogue of low-frequency quasi-periodic oscillations from Galactic microquasars or as evidence of modulation of the accretion flow by thermal instabilities in the 'inner' accretion disc.
Additional Information© 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2013 September 4. Received 2013 September 4; in original form 2013 August 28. First published online: September 27, 2013. We thank Russ Keeney for his support of observations at OVRO. The OVRO 40-m programme is supported in part by NASA grants NNX08AW31G and NNX11A043G and NSF grants AST-0808050 and AST-1109911. TH was supported by the Jenny and Antti Wihuri foundation. Support from MPIfR for upgrading the OVRO 40-m telescope receiver is acknowledged. We thank V. Pavlidou for useful discussions. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
Published - MNRAS-2013-King-L114-7.pdf
Submitted - 1309.1158v1.pdf