scholarly journals Rapid and Bright Stellar-mass Binary Black Hole Mergers in Active Galactic Nuclei

2017 ◽  
Vol 835 (2) ◽  
pp. 165 ◽  
Author(s):  
Imre Bartos ◽  
Bence Kocsis ◽  
Zoltán Haiman ◽  
Szabolcs Márka
Keyword(s):  
Black Hole ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Stellar Mass ◽  
Binary Black Hole

SDSS J154751.94+025550 with double-peaked broad H β but single-peaked broad H α: a candidate for central binary black hole system?

2021 ◽  
Vol 507 (4) ◽  
pp. 5205-5213
Author(s):  
XueGuang Zhang
Keyword(s):  
Black Hole ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Emission Lines ◽  
Broad Line ◽  
Line Profiles ◽  
Physical Conditions ◽  
Binary Black Hole ◽  
Sinusoidal Function

ABSTRACT In this manuscript, an interesting blue active galactic nuclei (AGNs) SDSS J154751.94+025550 (=SDSS J1547) is reported with very different line profiles of broad Balmer emission lines: double-peaked broad H β but single-peaked broad H α. SDSS J1547 is the first AGN with detailed discussions on very different line profiles of the broad Balmer emission lines, besides the simply mentioned different broad lines in the candidate for a binary black hole (BBH) system in SDSS J0159+0105. The very different line profiles of the broad Balmer emission lines can be well explained by different physical conditions to two central BLRs in a central BBH system in SDSS J1547. Furthermore, the long-term light curve from CSS can be well described by a sinusoidal function with a periodicity about 2159 d, providing further evidence to support the expected central BBH system in SDSS J1547. Therefore, it is interesting to treat different line profiles of broad Balmer emission lines as intrinsic indicators of central BBH systems in broad line AGN. Under assumptions of BBH systems, 0.125 per cent of broad-line AGN can be expected to have very different line profiles of broad Balmer emission lines. Future study on more broad line AGN with very different line profiles of broad Balmer emission lines could provide further clues on the different line profiles of broad Balmer emission lines as indicator of BBH systems.

scholarly journals Localization of binary black hole mergers with known inclination

2019 ◽  
Vol 488 (3) ◽  
pp. 4459-4463 ◽  
Author(s):  
K Rainer Corley ◽  
Imre Bartos ◽  
Leo P Singer ◽  
Andrew R Williamson ◽  
Zoltán Haiman ◽  
...  
Keyword(s):  
Black Hole ◽  
Binary System ◽  
Active Galactic Nuclei ◽  
Prior Information ◽  
Galactic Nuclei ◽  
Electromagnetic Emission ◽  
Accretion Discs ◽  
Host Galaxies ◽  
Binary Black Hole

ABSTRACT The localization of stellar-mass binary black hole mergers using gravitational waves is critical in understanding the properties of the binaries’ host galaxies, observing possible electromagnetic emission from the mergers, or using them as a cosmological distance ladder. The precision of this localization can be substantially increased with prior astrophysical information about the binary system. In particular, constraining the inclination of the binary can reduce the distance uncertainty of the source. Here, we present the first realistic set of localizations for binary black hole mergers, including different prior constraints on the binaries’ inclinations. We find that prior information on the inclination can reduce the localization volume by a factor of 3. We discuss two astrophysical scenarios of interest: (i) follow-up searches for beamed electromagnetic/neutrino counterparts and (ii) mergers in the accretion discs of active galactic nuclei.

scholarly journals Spin Evolution of Stellar-mass Black Hole Binaries in Active Galactic Nuclei

2020 ◽  
Vol 899 (1) ◽  
pp. 26 ◽  
Author(s):  
Hiromichi Tagawa ◽  
Zoltán Haiman ◽  
Imre Bartos ◽  
Bence Kocsis
Keyword(s):  
Black Hole ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Stellar Mass ◽  
Black Hole Binaries ◽  
Spin Evolution

scholarly journals Cosmic Evolution of Stellar-mass Black Hole Merger Rate in Active Galactic Nuclei

2020 ◽  
Vol 896 (2) ◽  
pp. 138 ◽  
Author(s):  
Y. Yang ◽  
I. Bartos ◽  
Z. Haiman ◽  
B. Kocsis ◽  
S. Márka ◽  
...  
Keyword(s):  
Black Hole ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Stellar Mass ◽  
Cosmic Evolution ◽  
Merger Rate

scholarly journals Radio and X-ray detections of GX 339–4 in quiescence using MeerKAT and Swift

2020 ◽  
Vol 493 (1) ◽  
pp. L132-L137 ◽  
Author(s):  
E Tremou ◽  
S Corbel ◽  
R P Fender ◽  
P A Woudt ◽  
J C A Miller-Jones ◽  
...  
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Active Galactic Nuclei ◽  
Binary Systems ◽  
Accretion Rate ◽  
Galactic Nuclei ◽  
Stellar Mass ◽  
X Ray ◽  
Accretion Process ◽  
Upper Limits

ABSTRACT The radio–X-ray correlation that characterizes accreting black holes at all mass scales – from stellar mass black holes in binary systems to supermassive black holes powering active galactic nuclei – is one of the most important pieces of observational evidence supporting the existence of a connection between the accretion process and the generation of collimated outflows – or jets – in accreting systems. Although recent studies suggest that the correlation extends down to low luminosities, only a handful of stellar mass black holes have been clearly detected, and in general only upper limits (especially at radio wavelengths) can be obtained during quiescence. We recently obtained detections of the black hole X-ray binary (XRB) GX 339–4 in quiescence using the Meer Karoo Array Telescope (MeerKAT) radio telescope and Swift X-ray Telescope instrument on board the Neil Gehrels Swift Observatory, probing the lower end of the radio–X-ray correlation. We present the properties of accretion and of the connected generation of jets in the poorly studied low-accretion rate regime for this canonical black hole XRB system.

MASSIVE BINARY BLACK HOLE IN ACTIVE GALACTIC NUCLEI AS COSMIC RAYS GENERATOR

1995 ◽  
Vol 04 (02) ◽  
pp. 215-218
Author(s):  
V.I. DOKUCHAEV
Keyword(s):  
Black Hole ◽  
Cosmic Rays ◽  
Active Galactic Nuclei ◽  
Orbital Motion ◽  
Galactic Nuclei ◽  
Frictional Drag ◽  
High Energies ◽  
Binary Black Hole ◽  
Bow Shocks ◽  
Binary Orbit

A model of bow shocks generated by a supersonic orbital motion of a gravitationally bound massive binary black hole in the dense environment of active galactic nuclei (AGN) is proposed. The binary orbit is evolutionary contracting due to gravitational radiation and frictional drag in the ambient gas. The model provides the suitable conditions for the acceleration of cosmic rays up to the ultra-high energies.

scholarly journals Symmetry Breaking in Dynamical Encounters in the Disks of Active Galactic Nuclei

2021 ◽  
Vol 923 (2) ◽  
pp. L23
Author(s):  
Yi-Han Wang ◽  
Barry McKernan ◽  
Saavik Ford ◽  
Rosalba Perna ◽  
Nathan W. C. Leigh ◽  
...  
Keyword(s):  
Black Hole ◽  
Angular Momentum ◽  
Active Galactic Nuclei ◽  
Numerical Experiments ◽  
Semimajor Axis ◽  
Galactic Nuclei ◽  
High Accuracy ◽  
Broken Symmetry ◽  
Asymmetric Distribution ◽  
Binary Black Hole

Abstract The disks of active galactic nuclei (AGNs) may be important sites of binary black hole (BBH) mergers. Here we show via numerical experiments with the high-accuracy, high-precision code SpaceHub that broken symmetry in dynamical encounters in AGN disks can lead to asymmetry between prograde and retrograde BBH mergers. The direction of the hardening asymmetry depends on the initial binary semimajor axis. Under the assumption that the spin of the BHs becomes aligned with the angular momentum of the disk on a short timescale compared with the encounter timescale, an asymmetric distribution of mass-weighted projected spin χ eff is predicted in LIGO–Virgo detections of BBH mergers from AGN disks. In particular, this model predicts that positive χ eff BBH mergers are most likely for encounters with massive tertiaries in migration traps at radial distances ≳500–600 gravitational radii.

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