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Population III Binary Black Holes: Effects of Convective Overshooting on Formation of GW190521
Ataru Tanikawa, Tomoya Kinugawa, Takashi Yoshida +2
GW190521 is a merger of two black holes (BHs), wherein at least one BH lies within the pair-instability (PI) mass gap, and it is difficult to form because of the effects of PI supe…
Merger rate density of Population III binary black holes below, above, and in the pair-instability mass gap
Ataru Tanikawa, Hajime Susa, Takashi Yoshida +2
We present the merger rate density of Population (Pop.) III binary black holes (BHs) by means of a widely-used binary population synthesis code BSE with extensions to very massive…
Gaia's Detectability of Black Hole-Main Sequence Star Binaries Formed in Open Clusters
Minori Shikauchi, Jun Kumamoto, Ataru Tanikawa +1
Black hole-main sequence star (BH-MS) binaries are one of the targets of the future data releases of the astrometric satellite {\it Gaia}. They are supposed to be formed in two mai…
Merger rate density of binary black holes formed in open clusters
Jun Kumamoto, Michiko S. Fujii, Ataru Tanikawa
Several binary black holes (BBHs) have been observed using gravitational wave detectors. For the formation mechanism of BBHs, two main mechanisms, isolated binary evolution and dyn…