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https://doi.org/10.21256/zhaw-4915| 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 10.1093/mnras/sts545 |
| Published in: | Monthly Notices of the Royal Astronomical Society |
| Volume(Issue): | 429 |
| Issue: | 4 |
| Page(s): | 2974 |
| Pages to: | 2985 |
| Issue Date: | Mar-2013 |
| Publisher / Ed. Institution: | Oxford University Press |
| ISSN: | 1365-2966 0035-8711 |
| Language: | English |
| Subjects: | Astro-ph.GA |
| Subject (DDC): | 500: Natural sciences |
| 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) |
| URI: | https://digitalcollection.zhaw.ch/handle/11475/13435 |
| 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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| File | Description | Size | Format | |
|---|---|---|---|---|
| 2013_De_Lorenzi_Three-integral_multi-component_dynamical_models.pdf | 2.71 MB | Adobe PDF |  View/Open |
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De Lorenzi, F., Hartmann, M., Debattista, V. P., Seth, A. C., & Gerhard, O. (2013). Three-integral multi-component dynamical models and simulations of the nuclear star cluster in NGC 4244. Monthly Notices of the Royal Astronomical Society, 429(4), 2974–2985. https://doi.org/10.21256/zhaw-4915
De Lorenzi, F. et al. (2013) ‘Three-integral multi-component dynamical models and simulations of the nuclear star cluster in NGC 4244’, Monthly Notices of the Royal Astronomical Society, 429(4), pp. 2974–2985. Available at: https://doi.org/10.21256/zhaw-4915.
F. De Lorenzi, M. Hartmann, V. P. Debattista, A. C. Seth, and O. Gerhard, “Three-integral multi-component dynamical models and simulations of the nuclear star cluster in NGC 4244,” Monthly Notices of the Royal Astronomical Society, vol. 429, no. 4, pp. 2974–2985, Mar. 2013, doi: 10.21256/zhaw-4915.
DE LORENZI, Flavio, Markus HARTMANN, Victor P. DEBATTISTA, Anil C. SETH und Ortwin GERHARD, 2013. Three-integral multi-component dynamical models and simulations of the nuclear star cluster in NGC 4244. Monthly Notices of the Royal Astronomical Society. März 2013. Bd. 429, Nr. 4, S. 2974–2985. DOI 10.21256/zhaw-4915
De Lorenzi, Flavio, Markus Hartmann, Victor P. Debattista, Anil C. Seth, and Ortwin Gerhard. 2013. “Three-Integral Multi-Component Dynamical Models and Simulations of the Nuclear Star Cluster in NGC 4244.” Monthly Notices of the Royal Astronomical Society 429 (4): 2974–85. https://doi.org/10.21256/zhaw-4915.
De Lorenzi, Flavio, et al. “Three-Integral Multi-Component Dynamical Models and Simulations of the Nuclear Star Cluster in NGC 4244.” Monthly Notices of the Royal Astronomical Society, vol. 429, no. 4, Mar. 2013, pp. 2974–85, https://doi.org/10.21256/zhaw-4915.
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