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- W3080971874 endingPage "126" @default.
- W3080971874 startingPage "126" @default.
- W3080971874 abstract "We perform high-resolution simulations to follow the orbital decay of 5 × 105 and 107 M⊙ massive black hole (MBH) pairs embedded in a circumnuclear gas disk (CND), from the CND scale (100 pc) down to 0.1–0.01 pc, the scale at which a circumbinary disk (CBD) could form. The MBHs' erratic orbital evolution is characterized by three stages: (i) a slow initial decay that leads to some circularization; (ii) a fast-migration phase, analogous to type III migration for massive planets in protoplanetary disks, in which angular momentum is efficiently drained by disk-driven torques arising from the co-orbital region of the secondary MBH, at a distance of 1–3 Hill radii; and (iii) a very slow decay phase, in which orbital angular momentum can even increase. In this last stage, a CBD forms when the parsec-scale decay rate becomes small enough to allow sufficient time for a cavity to be carved. When this happens, the MBH separation nearly stalls in our higher-resolution run. We suggest an empirically modified gap-opening criterion that takes into account such timescale effects, as well as other deviations from standard assumptions. Interestingly, a CBD does not form in the lower-resolution runs, resulting in a faster subparsec decay. Our findings show that the subparsec MBH pairing in gaseous disks is a stochastic and fragile process. Additional mechanisms, such as the stellar-driven hardening, may be necessary to guarantee that the gravitational wave emission phase is entered and the MBHs become accessible to future detectors such as the Laser Interferometer Space Antenna." @default.
- W3080971874 created "2020-09-01" @default.
- W3080971874 creator A5003918379 @default.
- W3080971874 creator A5005306009 @default.
- W3080971874 creator A5005452219 @default.
- W3080971874 creator A5049934008 @default.
- W3080971874 creator A5082912210 @default.
- W3080971874 date "2020-08-20" @default.
- W3080971874 modified "2023-09-24" @default.
- W3080971874 title "The Erratic Path to Coalescence of LISA Massive Black Hole Binaries in Subparsec-resolution Simulations of Smooth Circumnuclear Gas Disks" @default.
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- W3080971874 doi "https://doi.org/10.3847/1538-4357/aba624" @default.
- W3080971874 hasPublicationYear "2020" @default.
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