scholarly journals High-velocity stars from the interaction of a globular cluster and a massive black hole binary

2016 ◽  
Vol 458 (3) ◽  
pp. 2596-2603 ◽  
Author(s):  
G. Fragione ◽  
R. Capuzzo-Dolcetta
Keyword(s):  
Black Hole ◽  
Globular Cluster ◽  
High Velocity ◽  
Massive Black Hole ◽  
Black Hole Binary

scholarly journals Astrophysical constraints on massive black hole binary evolution from pulsar timing arrays

2015 ◽  
Vol 455 (1) ◽  
pp. L72-L76 ◽  
Author(s):  
Hannah Middleton ◽  
Walter Del Pozzo ◽  
Will M. Farr ◽  
Alberto Sesana ◽  
Alberto Vecchio
Keyword(s):  
Black Hole ◽  
Massive Black Hole ◽  
Pulsar Timing ◽  
Black Hole Binary ◽  
Binary Evolution

scholarly journals 9.13. Story of the discovery of a massive black hole in NGC4258

1998 ◽  
Vol 184 ◽  
pp. 407-408
Author(s):  
M. Miyoshi
Keyword(s):  
Black Hole ◽  
High Velocity ◽  
Band System ◽  
Wide Band ◽  
Massive Black Hole

In the Autumn of 1991, Nakai et al.(1993) began monitoring observations of water mega masers including NGC4258 using Nobeyama 45 m telescope. The 45 m telescope was equipped with wide band cooled HEMT receiver (22 GHz) and wide band spectrometers (AOS). Nakai used 8 AOSs which covered 4480 km/sec in velocity. It was from the wide-band system that the high velocity maser components were detected unexpectedly which locate ±1000 km/sec from the known features of the NGC4258 (Claussen et al. 1984). The finding was in May 1992 when busy Nakai got time checking the data deeply, half year had passed since the beginning of the observations.

scholarly journals H2O maser emission from the Seyfert 2 galaxy IC 2560: evidence for a super-massive black hole and a probe for mass-accretion rate

2002 ◽  
Vol 206 ◽  
pp. 400-403
Author(s):  
Yuko Ishihara ◽  
Naomasa Nakai ◽  
Naoko Iyomoto ◽  
Kazuo Makishima ◽  
Phil Diamond ◽  
...  
Keyword(s):  
Black Hole ◽  
High Velocity ◽  
Accretion Rate ◽  
Rotating Disk ◽  
Massive Black Hole ◽  
Central Mass ◽  
Maser Emission ◽  
Mass Accretion Rate ◽  
Systemic Velocity ◽  
Velocity Drift

Our observations of H2O masers have detected some high-velocity features and a secular velocity drift of the systemic features in the Seyfert 2 Galaxy IC 2560. The high-velocity features were blue- and red-shifted from the systemic velocity of 220-420 km s−1 and 210-350 km s−1, respectively. The velocity of the systemic features drifted at a secular rate of 2.62 km s−1 yr−1. Assuming the existence of a compact rotating disk as in NGC 4258, IC 2560 possesses a nuclear disk with inner and outer radii of 0.07 pc and 0.26 pc, respectively, and a confined mass of 2.8 × 106M⊙ at the center, making the central density > 2.1 × 109M⊙ pc−3. Such a dense object cannot be a cluster of stars, and this strongly suggests that the central mass is a super-massive black hole. Since the 2-10 keV luminosity of IC 2560 is 1 × 1041 erg s−1, the mass accretion rate of the suggested black hole must be 2 × 10−5M⊙ yr−1.

scholarly journals Tidal disruption events by a massive black hole binary

2016 ◽  
Vol 458 (2) ◽  
pp. 1712-1727 ◽  
Author(s):  
Angelo Ricarte ◽  
Priyamvada Natarajan ◽  
Lixin Dai ◽  
Paolo Coppi
Keyword(s):  
Black Hole ◽  
Tidal Disruption ◽  
Massive Black Hole ◽  
Black Hole Binary
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