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|Title:||Three-integral multi-component dynamical models and simulations of the nuclear star cluster in NGC 4244|
|Authors :||De Lorenzi, Flavio|
Debattista, Victor P.
Seth, Anil C.
|Published in :||Monthly notices of the Royal Astronomical Society|
|Publisher / Ed. Institution :||Oxford University Press|
|License (according to publishing contract) :||Licence according to publishing contract|
|Type of review:||Peer review (publication)|
|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 (www.nationallizenzen.ch)|
|Departement:||School of Engineering|
|Organisational Unit:||Institute of Applied Mathematics and Physics (IAMP)|
|Publication type:||Article in scientific journal|
|Appears in Collections:||Publikationen School of Engineering|
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|2013_De_Lorenzi_Three-integral_multi-component_dynamical_models.pdf||2.71 MB||Adobe PDF|
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