2018
DOI: 10.3847/1538-4357/aada47
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The Formation of Extremely Diffuse Galaxy Cores by Merging Supermassive Black Holes

Abstract: Given its velocity dispersion, the early-type galaxy NGC 1600 has an unusually massive (M • = 1.7 × 10 10 M ) central supermassive black hole (SMBH), surrounded by a large core (r b = 0.7 kpc) with a tangentially biased stellar distribution. We present high-resolution equal-mass merger simulations including SMBHs to study the formation of such systems. The structural parameters of the progenitor ellipticals were chosen to produce merger remnants resembling NGC 1600. We test initial stellar density slopes of ρ … Show more

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Cited by 72 publications
(121 citation statements)
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References 126 publications
(166 reference statements)
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“…Overall, the formation of the core is a rapid process (within 50 Myr of the SMBH interaction, Rantala et al 2018), and simulations indicate two straightforward observational predictions. One is the formation of the core, and the other is a tangentially anisotropic orbital distribution, as the core is depleted of orbits that cross the binary SMBH path (Quinlan et al 1995;Quinlan & Hernquist 1997;Milosavljević & Merritt 2001;Rantala et al 2018). The velocity anisotropy is indeed observable (e.g.…”
Section: Formation Of Stellar Coresmentioning
confidence: 79%
“…Overall, the formation of the core is a rapid process (within 50 Myr of the SMBH interaction, Rantala et al 2018), and simulations indicate two straightforward observational predictions. One is the formation of the core, and the other is a tangentially anisotropic orbital distribution, as the core is depleted of orbits that cross the binary SMBH path (Quinlan et al 1995;Quinlan & Hernquist 1997;Milosavljević & Merritt 2001;Rantala et al 2018). The velocity anisotropy is indeed observable (e.g.…”
Section: Formation Of Stellar Coresmentioning
confidence: 79%
“…cores, in large elliptical galaxies (cf. Faber et al 1997;Merritt 2006;Thomas et al 2016;Rantala et al 2018, and references therein).…”
Section: Accelerated Orbital Decay Due To the Ouroboros Effectmentioning
confidence: 99%
“…The simulations analyzed in this paper have been run using the recently developed Ketju code (see Rantala et al 2017Rantala et al , 2018 for full code details), which is an extension of the tree-SPH simulation code GADGET-3 (Springel et al 2005). The central idea of the code is the inclusion of a regularized region around every SMBH particle, in which the non-softened gravitational dynamics is computed using the regularized AR-CHAIN (Mikkola & Merritt 2008) integrator while the dynamics of the remaining particles is computed with the GADGET-3 leapfrog using the tree force calculation method.…”
Section: The Ketju Codementioning
confidence: 99%
“…Following Rantala et al (2018Rantala et al ( , 2019 we set the GADGET-3 integrator error tolerance to η = 0.002 and the force accuracy to α = 0.005, using the standard cell opening criterion (Springel et al 2005). The chain radius is set to r chain = 10 pc and the perturber radius to twice this value, i.e.…”
Section: Modeling the Final Phases Of Smbh Inspiralsmentioning
confidence: 99%