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Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Three-integral multi-component dynamical models and simulations of the nuclear star cluster in NGC 4244
Authors : De Lorenzi, Flavio
Hartmann, Markus
Debattista, Victor P.
Seth, Anil C.
Gerhard, Ortwin
DOI : 10.21256/zhaw-4915
Published in : Monthly Notices of the Royal Astronomical Society
Volume(Issue) : 429
Issue : 4
Pages : 2974
Pages to: 2985
Issue Date: Mar-2013
Publisher / Ed. Institution : Oxford University Press
ISSN: 1365-2966
Language : English
Subjects : Astro-ph.GA
Subject (DDC) : 500: Natural sciences and mathematics
Abstract: Adaptive optics observations of the flattened nuclear star cluster in the nearby edge-on spiral galaxy NGC 4244 using the Gemini near-infrared integral field spectrograph (NIFS) have revealed clear rotation. Using these kinematics plus 2MASS photometry, we construct a series of axisymmetric two-component particle dynamical models with our improved version of nmagic, a flexible χ2-made-to-measure code. The models consist of a nuclear cluster disc embedded within a spheroidal particle population. We find a mass for the nuclear star cluster of M=1.6+0.5−0.2×107M_sun within ∼42.4 pc (2 arcsec). We also explore the presence of an intermediate-mass black hole and show that models with a black hole as massive as M=5.0×105M_sun are consistent with the available data. Regardless of whether a black hole is present or not, the nuclear cluster is vertically anisotropic (βz < 0), as was found with earlier anisotropic Jeans models. We then use the models as initial conditions for N-body simulations. These simulations show that the nuclear star cluster is stable against non-axisymmetric perturbations. We also explore the effect of the nuclear cluster accreting star clusters at various inclinations. Accretion of a star cluster with mass 13 per cent that of the nuclear cluster is already enough to destroy the vertical anisotropy, regardless of orbital inclination.
Further description : erworben im Rahmen der Schweizer Nationallizenzen (
Fulltext version : Published version
License (according to publishing contract) : Licence according to publishing contract
Departement: School of Engineering
Organisational Unit: Institute of Applied Mathematics and Physics (IAMP)
Appears in Collections:Publikationen School of Engineering

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