Schwarzschild modelling of barred s0 galaxy NGC 4371

Autor(en): Behzad Tahmasebzadeh, Ling Zhu, Juntai Shen, Dimitri A. Gadotti, Monica Valluri, Sabine Thater, Glenn Van De Ven, Yunpeng Jin, Ortwin Gerhard, Peter Erwin, Prashin Jethwa, Alice Zocchi, Edward J. Lilley, Francesca Fragkoudi, Adriana De Lorenzo-Cáceres, Jairo Mendez-Abreu, Justus Neumann, Rui Guo
Abstrakt: We apply the barred Schwarzschild method developed by Tahmasebzadeh et al. (2022) to a barred S0 galaxy, NGC 4371, observed by IFU instruments from the TIMER and ATLAS3D projects. We construct the gravitational potential by combining a fixed black hole mass, a spherical dark matter halo, and stellar mass distribution deprojected from 3.6 μm SG image considering an axisymmetric disc and a triaxial bar. We independently modelled kinematic data from TIMER and ATLAS3D. Both models fit the data remarkably well. We find a consistent bar pattern speed from the two sets of models with and, respectively. The dimensionless bar rotation parameter is determined to be, indicating a likely slow bar in NGC 4371. Additionally, our model predicts a high amount of dark matter within the bar region (), which, aligned with the predictions of cosmological simulations, indicates that fast bars are generally found in baryon-dominated discs. Based on the best-fitting model, we further decompose the galaxy into multiple 3D orbital structures, including a BP/X bar, a classical bulge, a nuclear disc, and a main disc. The BP/X bar is not perfectly included in the input 3D density model, but BP/X-supporting orbits are picked through the fitting to the kinematic data. This is the first time a real barred galaxy has been modelled utilizing the Schwarzschild method including a 3D bar.
Organisation(en): Institut für Astrophysik
Externe Organisation(en): Chinese Academy of Sciences (CAS), University of Michigan, Shanghai Jiao Tong University, European Southern Observatory (Germany), Durham University, Max-Planck-Institut für extraterrestrische Physik, Instituto de Astrofísica de Canarias (IAC), Universidad de La Laguna, Max-Planck-Institut für Astronomie
Journal: Monthly Notices of the Royal Astronomical Society
Band: 534
Seiten: 861-882
Anzahl der Seiten: 22
ISSN: 0035-8711
DOI: https://doi.org/10.1093/mnras/stae2109
Publikationsdatum: 10-2024
Peer-reviewed: Ja
ÖFOS 2012: 103003 Astronomie, 103004 Astrophysik
Schlagwörter
ASJC Scopus Sachgebiete: Astronomy and Astrophysics, Space and Planetary Science
Link zum Portal: https://ucrisportal.univie.ac.at/de/publications/5296c482-0cca-4b2b-8be8-33daff4f2482

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