389 citations · 1.7k across the 39 of their papers we have counts for
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Recoil-regulated extreme mass-ratio inspirals in AGN disks
LingQin Xue, Zoltán Haiman, Hiromichi Tagawa +1
Extreme mass-ratio inspirals (EMRIs) are among the primary targets of future space-based gravitational-wave observatories, such as LISA, TianQin, and Taiji. Active galactic nucleus…
Properties of black hole mergers in disks of active galactic nuclei
Hiromichi Tagawa, Zoltán Haiman, Bence Kocsis
Ground-based gravitational wave (GW) observatories have detected approximately 200 binary black hole (BH) mergers. The astrophysical origin of these events are debated, with eviden…
Electromagnetic Flares from Compact-Object Mergers in AGN Disks: Signatures and Predictions
Hiromichi Tagawa, Zoltán Haiman, Shigeo S. Kimura +2
Accretion disks in active galactic nuclei (AGN) are promising sites for mergers of stellar-mass black holes (BHs) detectable via gravitational waves (GWs). These environments facil…
Evidence for a Delayed UV Counterpart to X-ray Quasi-periodic Eruptions in Ansky
Hengxiao Guo, Zhen Yan, Ya-Ping Li +15
X-ray quasi-periodic eruptions (QPEs) represent a novel population of extreme, repeating nuclear transients whose physical origins remain debated. A defining characteristic of QPEs…
Gravitational Wave Phase shifts of black hole mergers in AGN Disks
Hiromichi Tagawa, Connar Rowan, János Takátsy +4
Ground-based gravitational wave (GW) detectors have discovered about 200 compact object mergers. The astrophysical origins of these events are highly debated, and it is possible th…
Reconstructing the origin of black hole mergers using sparse astrophysical models
V. Gayathri, Giuliano Iorio, Hiromichi Tagawa +8
The astrophysical origin of binary black hole mergers discovered by LIGO and Virgo remains uncertain. Efforts to reconstruct the processes that lead to mergers typically rely on ei…
GW200208_222617 as an eccentric black-hole binary merger: properties and astrophysical implications
Isobel Romero-Shaw, Jakob Stegmann, Hiromichi Tagawa +4
Detecting orbital eccentricity in a stellar-mass black-hole merger would point to a non-isolated formation channel. Eccentric binaries can form in dense stellar environments such a…
Distinguishing the Origin of Eccentric Black Hole Mergers with Gravitational-wave Spin Measurements
Jakob Stegmann, Davide Gerosa, Isobel Romero-Shaw +3
It remains an open question whether the binary black hole mergers observed with gravitational-wave detectors originate from the evolution of isolated massive binary stars or were d…
LVK S241125n: Massive Binary Black Hole Merger Produces Gamma Ray Burst in Active Galactic Nucleus Disk
Shu-Rui Zhang, Yu Wang, Ye-Fei Yuan +6
Recently, the gravitational-wave (GW) event S241125n, detected by LIGO/Virgo/KAGRA (LVK), has been reported to coincide with a candidate detected by Swift-BAT/GUANO and an X-ray ca…
What Determines the Maximum Mass of AGN-assisted Black Hole Mergers?
LingQin Xue, Hiromichi Tagawa, Zoltan Haiman +1
The origin of merging binary black holes detected through gravitational waves remains a fundamental question in astrophysics. While stellar evolution imposes an upper mass limit of…
Time-dependent models of AGN disks with radiation from embedded stellar-mass black holes
Marguerite Epstein-Martin, Hiromichi Tagawa, Zoltan Haiman +1
The brightest steady sources of radiation in the universe, active galactic nuclei (AGN), are powered by gas accretion onto a central supermassive black hole (SMBH). The large sizes…
Indication for a compact object next to a LIGO-Virgo binary black hole merger
Shu-Cheng Yang, Wen-Biao Han, Hiromichi Tagawa +2
The astrophysical origin of binary black hole (BBH) mergers remains uncertain, although many events have been observed by the LIGO-Virgo-KAGRA network. Such mergers are potentially…
Shock cooling and breakout emission for optical flares associated with gravitational wave events
Hiromichi Tagawa, Shigeo S. Kimura, Zoltán Haiman +2
The astrophysical origin of stellar-mass black hole (BH) mergers discovered through gravitational waves (GWs) is widely debated. Mergers in the disks of active galactic nuclei (AGN…
High-energy electromagnetic, neutrino, and cosmic-ray emission by stellar-mass black holes in disks of active galactic nuclei
Hiromichi Tagawa, Shigeo S. Kimura, Zoltán Haiman
Some Seyfert galaxies are detected in high-energy gamma rays, but the mechanism and site of gamma-ray emission are unknown. Also, the origins of the cosmic high-energy neutrino and…
Flares from stars crossing active galactic nuclei disks on low-inclination orbits
Hiromichi Tagawa, Zoltán Haiman
The origin of the recently discovered new class of transients, X-ray quasi-periodic eruptions (QPEs), remains a puzzle. Due to their periodicity and association with active galacti…
Observable signatures of stellar-mass black holes in active galactic nuclei
Hiromichi Tagawa, Shigeo S. Kimura, Zoltán Haiman +2
Stellar-mass black holes (BHs) are predicted to be embedded in the disks of active galactic nuclei (AGN) due to gravitational drag and in-situ star formation. However, clear eviden…
Observable signature of merging stellar-mass black holes in active galactic nuclei
Hiromichi Tagawa, Shigeo S. Kimura, Zoltán Haiman +2
The origin of stellar-mass black hole mergers discovered through gravitational waves is being widely debated. Mergers in the disks of active galactic nuclei (AGN) represent a promi…
Can stellar-mass black hole growth disrupt disks of active galactic nuclei? The role of mechanical feedback
Hiromichi Tagawa, Shigeo S. Kimura, Zoltán Haiman +3
Stellar-mass BHs (sBHs) are predicted to be embedded in active galactic nuclei (AGN) disks due to gravitational drag and in-situ star formation. However, we find that due to a high…
Micro Tidal Disruption Events in Active Galactic Nuclei
Y. Yang, I. Bartos, G. Fragione +5
Active galactic nuclei (AGNs) can act as black hole assembly lines, funneling some of the stellar-mass black holes from the vicinity of the galactic center into the inner plane of…
Signatures of Hierarchical Mergers in Black Hole Spin and Mass distribution
Hiromichi Tagawa, Zoltán Haiman, Imre Bartos +2
Recent gravitational wave (GW) observations by LIGO/Virgo show evidence for hierarchical mergers, where the merging BHs are the remnants of previous BH merger events. These events…
Accretion-Induced Collapse of Neutron Stars in the Disks of Active Galactic Nuclei
Rosalba Perna, Hiromichi Tagawa, Zoltan Haiman +1
The disks of active galactic nuclei (AGNs) have emerged as a rich environment for the evolution of stars and their compact remnants. The very dense medium favors rapid accretion, w…
Mass-gap Mergers in Active Galactic Nuclei
Hiromichi Tagawa, Bence Kocsis, Zoltan Haiman +3
The recently discovered gravitational wave sources GW190521 and GW190814 have shown evidence of BH mergers with masses and spins that could be outside of the range expected from is…
Eccentric Black Hole Mergers in Active Galactic Nuclei
Hiromichi Tagawa, Bence Kocsis, Zoltan Haiman +3
The astrophysical origin of gravitational wave (GW) transients is a timely open question in the wake of discoveries by LIGO/Virgo. In active galactic nuclei (AGNs), binaries form a…
AGN as Potential Factories for Eccentric Black Hole Mergers
J. Samsing, I. Bartos, D. J. D'Orazio +6
There is some weak evidence that the black hole merger named GW190521 had a non-zero eccentricity. In addition, the component black holes' masses exceeded the limit predicted by st…