Line Shapes Emitted from Spiral Structures around Symmetric Orbits of Supermassive Binary Black Holes

Smailagic, M.; Bon, E.

doi:10.1007/s12036-015-9365-6

Cited by 4 publications

(4 citation statements)

References 68 publications

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“…In this scenario, the cavity is of the order of a, and the CB disk extends from 1.5a to 3a. Following the similar setup as Smailagić & Bon (2015), we built a SMBBH model with spiral arms and the surrounding CB disk in order to investigate the polarization signatures coming from the SMBBH. We keep the same mass of each component to be 5 × 10 7 M with the orbital separation the same as in the case for contact model a = 16.7 light days.…”

Section: Model Setupmentioning

confidence: 99%

Predicting the broad-lines polarization emitted by supermassive binary black holes

Savić

Marin

2019

A&A

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Context. Some of Type-1 active galactic nuclei (AGNs) are showing extremely asymmetric Balmer lines with the broad peak redshifted or blueshifted by thousands of km s −1 . These AGNs may be good candidates for supermassive binary black holes (SMBBHs). The complex line shapes can be very well due to the complex kinematics of the two broad line regions (BLRs). Therefore another methods should be applied to confirm the SMBBHs. One of them is spectropolarimetry. Aims. We rely on numerical modeling of the polarimetry of binary black holes systems since polarimetry is highly sensitive to geometry, in order to find specific influence of supermassive binary black hole (SMBBH) geometry and dynamics on polarized parameters across the broad line profiles. We apply our method to SMBBHs in which both components are assumed to be AGNs with distances at the sub-pc scale. Methods. We use a Monte Carlo radiative transfer code that simulates the geometry, dynamics and emission pattern of a binary system where two black holes are getting increasingly closer. Each gravitational well is accompanied by its own BLR and the whole system is surrounded by an accretion flow from the distant torus. We examine the emission line deformation and predict the associated polarization which could be observed. Results. We model scattering induced broad line polarization for various BLR geometries with complex kinematics. We find that the presence of SMBBHs can produce complex polarization angle profiles ϕ and strongly affect the polarized and unpolarized line profiles. Depending on the phase of the SMBBH, the resulting double-peaked emission lines either show red or blue peak dominance, or both the peak can have the same intensity. In some cases, the whole line profile appears as a single Gaussian line, hiding the true nature of the source. Conclusions. Our results suggest that future observation with the high resolution spectropolarimetry of optical broad emission lines could play an important role in detecting sub-pc SMBBHs.

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Section: Model Setupmentioning

confidence: 99%

Predicting the broad-lines polarization emitted by supermassive binary black holes

Savić

Marin

2019

A&A

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“…Some simulations performed in order to characterize the SMBBH systems, show the formation of a circum binary disk, inside of which the two BHs are accreting matter forming mini accretion disks (e.g. Hayasaki et al 2008;MacFadyen & Milosavljević 2008;Bogdanović et al 2008;Bogdanović et al 2009;Cuadra et al 2009;Smailagić & Bon 2015). Further out, the circum-binary disk cools and may form a torus.…”

Section: Binary Black Holesmentioning

confidence: 99%

Evidence for Periodicity in 43 Year-Long Monitoring of NGC 5548

Bon¹,

Zucker²,

Netzer³

et al. 2016

ApJS

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113

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We present an analysis of 43 years (1972 to 2015) of spectroscopic observations of the Seyfert 1 galaxy NGC 5548. This includes 12 years of new unpublished observations (2003 to 2015). We compiled about 1600 Hβ spectra and analyzed the long-term spectral variations of the 5100Å continuum and the Hβ line. Our analysis is based on standard procedures, including the LombScargle method, which is known to be rather limited to such heterogeneous data sets, and a new method developed specifically for this project that is more robust and reveals a -2 -∼5700 day periodicity in the continuum light curve, the Hβ light curve, and the radial velocity curve of the red wing of the Hβ line. The data are consistent with orbital motion inside the broad emission line region of the source. We discuss several possible mechanisms that can explain this periodicity, including orbiting dusty and dust-free clouds, a binary black hole system, tidal disruption events, and the effect of an orbiting star periodically passing through an accretion disk.

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“…Our investigations of the sub-pc SMBH binaries using spectroscopy have been performed in two directions: i) modeling the sub-pc SMBH binary systems in order to detect specific feature in the spectral lines and their shifts (Popović et al 2000, Jovanović et al 2014, Smailagić & Bon 2015, Simić & Popović 2016, and ii) exploring the long-term variability in the line shapes (Bon et al 2012, Shapovalova et al 2016. Note here that we made a discovery of the first spectroscopically resolved sub-parsec orbit of a SMBH binary (see Bon at al.…”

Section: Super-massive Binary Black Holesmentioning

confidence: 99%

Spectroscopy and spectropolarimetry of AGN: from observations to modelling

Ilić¹,

Bon²,

Bon³

et al. 2018

Preprint

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Active galactic nuclei (AGN) are one of the most luminous objects in the Universe, emitting powerful continuum and line emission across all wavelength bands. They represent an important link in the investigations of the galaxy evolution and cosmology. The resolving of the AGN inner structure is still a difficult task with current instruments, therefore the spectroscopy and spectropolarimetry are crucial tools to investigate these objects and their components, such as the properties of the supermassive black hole, the broad line region, and the dusty torus. In this review, we present the results of the project "Astrophysical spectroscopy of extragalactic objects", from the observations, data processing and analysis, to the modelling of different regions in AGN.

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Line Shapes Emitted from Spiral Structures around Symmetric Orbits of Supermassive Binary Black Holes

Abstract: Abstract.Variability

Cited by 4 publications

References 68 publications

Predicting the broad-lines polarization emitted by supermassive binary black holes

Predicting the broad-lines polarization emitted by supermassive binary black holes

Evidence for Periodicity in 43 Year-Long Monitoring of NGC 5548

Spectroscopy and spectropolarimetry of AGN: from observations to modelling

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