Periodicity in the continua and broad line curves of a quasar E1821+643

Abstract

Here we present an in-depth analysis of the periodicity of the continua and broad emission lines of a quasar E1821+643. We applied non-parametric composite models, the linear sum of stationary and non-stationary Gaussian processes, and quantified contribution of their periodic parts. We found important qualitative differences among the three periodic signals. Periods of $\sim 2200$ and $\sim 4500$ days appear in both continua 5100 Å\, and 4200 Å\,, as well as in the H$\gamma$ emission line. Their integer ratio is nearly harmonic $\sim \frac{1}{2}$, suggesting the same physical origin. We discuss the nature of these periods, proposing that the system of two objects in dynamically interaction can be origin of two largest periods.

arXiv commentaccepted for publication in Astrophysics and Space Science,13 pages, 6 figures

References in corpus (23)

• Maximum gravitational recoil
• A massive binary black-hole system in OJ287 and a test of general relativity
• Supermassive recoil velocities for binary black-hole mergers with antialigned spins
• A possible close supermassive black-hole binary in a quasar with optical periodicity
• A systematic search for close supermassive black hole binaries in the Catalina Real-Time Transient Survey
• Alignment of the spins of supermassive black holes prior to coalescence
• Modeling reverberation mapping data II: dynamical modeling of the Lick AGN Monitoring Project 2008 dataset
• False periodicities in quasar time-domain surveys
• Flexible and Scalable Methods for Quantifying Stochastic Variability in the Era of Massive Time-Domain Astronomical Data Sets
• Multiwavelength Evidence for Quasi-periodic Modulation in the Gamma-ray Blazar PG 1553+113
• Predicting the direction of the final spin from the coalescence of two black holes
• Circumbinary MHD Accretion into Inspiraling Binary Black Holes
• A Stochastic Model for the Luminosity Fluctuations of Accreting Black Holes
• BGLS: A Bayesian formalism for the generalised Lomb-Scargle periodogram
• Super-massive binary black holes and emission lines in active galactic nuclei
• Early flattening of dark matter cusps in dwarf spheroidal galaxies
• Listening to the Universe with Gravitational-Wave Astronomy
• Modeling gravitational recoil from precessing highly-spinning unequal-mass black-hole binaries
• Spectropolarimetric evidence for a kicked supermassive black hole in the Quasar E1821+643
• Assessment of stochastic and deterministic models of 6304 quasar lightcurves from SDSS Stripe 82
• Ripple effects & oscillations in the broad FeKa line as a probe of massive black hole mergers
• A Degeneracy in DRW Modelling of AGN Light Curves
• First long-term optical spectro-photometric monitoring of a binary black hole candidate E1821+643: I. Variability of spectral lines and continuum

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• On possible proxies of AGN light curves cadence selection in future time domain surveys
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