Unveiling Sub-pc Supermassive Black Hole Binary Candidates in Active Galactic Nuclei

@article{Serafinelli2020UnveilingSS,
  title={Unveiling Sub-pc Supermassive Black Hole Binary Candidates in Active Galactic Nuclei},
  author={Roberto Serafinelli and Paola Severgnini and Valentina Braito and Roberto Della Ceca and Cristian Vignali and Filippo Ambrosino and Claudia Cicone and Alessandra Zaino and Massimo Dotti and Alberto Sesana and Vittoria E. Gianolli and Lucia Ballo and Valentina La Parola and Gabriele A. Matzeu},
  journal={The Astrophysical Journal},
  year={2020},
  volume={902}
}
The elusive supermassive black hole binaries (SMBHBs) are thought to be the penultimate stage of galaxy mergers, preceding a final coalescence phase. SMBHBs are sources of continuous gravitational waves, possibly detectable by pulsar timing arrays; the identification of candidates could help in performing targeted gravitational wave searches. Due to SMBHBs’ origin in the innermost parts of active galactic nuclei (AGN), X-rays are a promising tool for unveiling their presence, by means of either… 

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References

SHOWING 1-10 OF 102 REFERENCES

Swift data hint at a binary supermassive black hole candidate at sub-parsec separation

Dual/binary Supermassive Black Hole (SMBH) systems are the inevitable consequence of the current Lambda Cold Dark Matter cosmological paradigm. In this context, we discuss here the properties of

Identifying decaying supermassive black hole binaries from their variable electromagnetic emission

Supermassive black hole binaries (SMBHBs) with masses in the mass range ∼(104–107) M⊙/(1 + z), produced in galaxy mergers, are thought to complete their coalescence due to the emission of

The BAT AGN Spectroscopic Survey. XVIII. Searching for Supermassive Black Hole Binaries in X-Rays

Theory predicts that a supermassive black hole binary (SMBHB) could be observed as a luminous active galactic nucleus (AGN) that periodically varies on the order of its orbital timescale. In X-rays,

A systematic search for close supermassive black hole binaries in the Catalina Real-time Transient Survey

Hierarchical assembly models predict a population of supermassive black hole (SMBH) binaries. These are not resolvable by direct imaging but may be detectable via periodic variability (or nanohertz

A Population of Short-Period Variable Quasars from PTF as Supermassive Black Hole Binary Candidates

Supermassive black hole binaries (SMBHBs) at sub-parsec separations should be common in galactic nuclei, as a result of frequent galaxy mergers. Hydrodynamical simulations of circum-binary discs

SPECTROSCOPIC INDICATION OF A CENTI-PARSEC SUPERMASSIVE BLACK HOLE BINARY IN THE GALACTIC CENTER OF NGC 5548

As a natural consequence of cosmological hierarchical structure formation, sub-parsec supermassive black hole binaries (SMBHBs) should be common in galaxies but thus far have eluded spectroscopic

A Supermassive Binary Black Hole with Triple Disks

Hierarchical structure formation inevitably leads to the formation of supermassive binary black holes (BBHs) with a subparsec separation in galactic nuclei. However, to date there has been no

A Compact Supermassive Binary Black Hole System

We report on the discovery of a supermassive binary black hole system in the radio galaxy 0402+379, with a projected separation between the two black holes of just 7.3 pc. This is the closest black

Testing the Binary Hypothesis: Pulsar Timing Constraints on Supermassive Black Hole Binary Candidates

The advent of time domain astronomy is revolutionizing our understanding of the universe. Programs such as the Catalina Real-time Transient Survey (CRTS) or the Palomar Transient Factory (PTF)
...