Growth of Supermassive Black Holes, Galaxy Mergers and Supermassive Binary Black Holes

Komossa, S.; Baker, John G.; Liu, F. K.

doi:10.1017/s1743921316005378

Cited by 3 publications

(3 citation statements)

References 59 publications

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“…However, only separations shorter than about milli pc separations ensure orbital periods of a few years or less and therefore avoid excessively long observational campaigns. This provides key information on population synthesis and the assembly of supermassive black holes through cosmic time [36][37][38][39][40]. Especially in light of recent surges in the number of proposed binary candidates, even current constraints from the unresolved GW background from PTAs are starting to become informative, favoring the hypothesis that false positives may be quite abundant in the current catalogues of proposed binary sources [41].…”

Section: Pcmentioning

confidence: 99%

Relativistic Aspects of Accreting Supermassive Black Hole Binaries in Their Natural Habitat: A Review

Gold

2019

Galaxies

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In this review a summary is given on recent theoretical work, on understanding accreting supermassive black hole binaries in the gravitational wave (GW)-driven regime. A particular focus is given to theoretical predictions of properties of disks and jets in these systems during the gravitational wave driven phase. Since a previous review by Schnittman 2013, which focussed on Newtonian aspects of the problem, various relativistic aspects have been studied. In this review we provide an update on these relativistic aspects. Further, a perspective is given on recent observational developments that have seen a surge in the number of proposed supermassive black hole binary candidates. The prospect of bringing theoretical and observational efforts closer together makes this an exciting field of research for years to come.

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Section: Pcmentioning

confidence: 99%

Relativistic Aspects of Accreting Supermassive Black Hole Binaries in Their Natural Habitat: A Review

Gold

2019

Galaxies

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“…The capability to observe and characterize binary SMBHs across all phases of their evolutionary trajectory, extending from the wide separation (Komossa et al 2003) to more compact configurations (Popović et al 2000;Graham et al 2015;Charisi et al 2016;Chen et al 2020;Liu et al 2020;Songsheng et al 2020;Wang & Bon et al 2020;Wang et al2020a;Popović et al 2021;Simić et al 2022), would enable us to address the history, demography, origin, and coevolution of SMBHs and galaxies throughout cosmic time (e.g., Komossa et al 2016Komossa et al , 2021.…”

Section: Introductionmentioning

confidence: 99%

Bayesian Synthesis of Astrometric Wobble and Total Light Curves in Close Binary Supermassive Black Holes

Kovačević,

Songsheng,

Wang

et al. 2024

ApJ

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We test the potential of Bayesian synthesis of upcoming multi-instrument data to extract orbital parameters and individual light curves of close binary supermassive black holes (CB-SMBH) with subparsec separations. Next-generation interferometers, will make possible the observation of astrometric wobbles in CB-SMBH. Combining them with periodic variable time-domain data from surveys like the Vera C. Rubin Legacy Survey of Space and Time, allows for more information on CB-SMBH candidates compared to standalone observational methods. Our method reliably determines binary parameters and component fluxes from binary total flux across long-term, intermediate, and short-term binary dynamics and observational configurations, assuming 10 annual observations, even in short period “q-accrete” objects. Expected CB-SMBH astrometric wobbles constructed from binary dynamical parameters might serve in refining observational strategies for CB-SMBH. Combination of inferred mass ratio, light curves of binary components, and observed photocenter wobbles can be a proxy for the activity states of CB-SMBH components.

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“…They are an important ingredient in our understanding of galaxy evolution and SMBH demographics, and during their final coalescence they are the loudest known sources of gravitational waves in the Universe (e.g. Begelman et al 1980;Volonteri et al 2003;Komossa et al 2016). They reveal their presence by semi-periodicity in light curves or in spatial structures.…”

Section: Introductionmentioning

confidence: 99%

Absence of the predicted 2022 October outburst of OJ 287 and implications for binary SMBH scenarios

Komossa

Grupe

Kraus

et al. 2023

Monthly Notices of the Royal Astronomical Society: Letters

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The project MOMO (Multiwavelength Observations and Modelling of OJ 287) was set up to test predictions of binary supermassive black hole (SMBH) scenarios and to understand disk-jet physics of the blazar OJ 287. After a correction, the precessing binary (PB) SMBH model predicted the next main outburst of OJ 287 in 2022 October, making the outburst well observable and the model testable. We have densely covered this period in our ongoing multi-frequency radio, optical, UV, and X-ray monitoring. The predicted outburst was not detected. Instead, OJ 287 was at low optical–UV emission levels, declining further into November. The predicted thermal bremsstrahlung spectrum was not observed either, at any epoch. Further, applying scaling relations, we estimate a SMBH mass of OJ 287 of 108 M⊙. The latest in a sequence of deep low-states that recur every 1–2 yrs is used to determine an upper limit on the Eddington ratio and on the accretion-disk luminosity. This limit is at least a factor of 10 lower than required by the PB model with its massive primary SMBH of >1010M⊙. All these results favor alternative binary SMBH models of OJ 287 that neither require strong orbital precession nor a very large mass of the primary SMBH.

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Growth of Supermassive Black Holes, Galaxy Mergers and Supermassive Binary Black Holes

Cited by 3 publications

References 59 publications

Relativistic Aspects of Accreting Supermassive Black Hole Binaries in Their Natural Habitat: A Review

Relativistic Aspects of Accreting Supermassive Black Hole Binaries in Their Natural Habitat: A Review

Bayesian Synthesis of Astrometric Wobble and Total Light Curves in Close Binary Supermassive Black Holes

Absence of the predicted 2022 October outburst of OJ 287 and implications for binary SMBH scenarios

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