389 citations · 1.7k across the 39 of their papers we have counts for
8 papers · 1 filter
Formation and Evolution of Compact Object Binaries in AGN Disks
Hiromichi Tagawa, Zoltan Haiman, Bence Kocsis
The astrophysical origin of gravitational wave (GW) events discovered by LIGO/VIRGO remains an outstanding puzzle. In active galactic nuclei (AGN), compact-object binaries form, ev…
Making a supermassive star by stellar bombardment
Hiromichi Tagawa, Zoltan Haiman, Bence Kocsis
Approximately two hundred supermassive black holes (SMBHs) have been discovered within the first Gyr after the Big Bang. One pathway for the formation of SMBHs is through the…
Hypervelocity Stars from a Supermassive Black Hole-Intermediate-mass Black Hole binary
Alexander Rasskazov, Giacomo Fragione, Nathan W. C. Leigh +4
In this paper we consider a scenario where the currently observed hypervelocity stars in our Galaxy have been ejected from the Galactic center as a result of dynamical interactions…
Metallicity dependence of the Hercules stream in Gaia/RAVE data -- explanation by non-closed orbits
Kohei Hattori, Naoteru Gouda, Taihei Yano +4
The origin of the Hercules stream, the most prominent velocity substructure in the Solar neighbour disc stars, is still under debate. Recent accurate measurements of position, velo…
Merger of multiple accreting black holes concordant with gravitational wave events
Hiromichi Tagawa, Masayuki Umemura
Recently, advanced Laser Interferometer Gravitational-Wave Observatory (aLIGO) has detected black hole (BH) merger events, most of which are sourced by BHs more massive than $30~M_…
The validation of made-to-measure method for reconstruction of phase space distribution functions
Hiromichi Tagawa, Naoteru Gouda, Taihei Yano +1
We investigate how accurately phase space distribution functions (DFs) in galactic models can be reconstructed by a made-to-measure (M2M) method, which constructs -particle mode…
Mergers of accreting stellar-mass black holes
Hiromichi Tagawa, Masayuki Umemura, Naoteru Gouda
We present post-Newtonian -body simulations on mergers of accreting stellar-mass black holes (BHs), where such general relativistic effects as the pericenter shift and gravitati…
Early Cosmic Merger of Multiple Black Holes
Hiromichi Tagawa, Masayuki Umemura, Naoteru Gouda +2
We perform numerical simulations on the merger of multiple black holes (BHs) in primordial gas at early cosmic epochs. We consider two cases of BH mass: and…