Numerical simulations of bar formation in the Local Group
Entity
UAM. Departamento de Física TeóricaPublisher
Royal Astronomical Society; Oxford University PressDate
2022-01-17Citation
10.1093/mnras/stac105
Monthly Notices of the Royal Astronomical Society 511.2 (2022): 2423-2433
ISSN
0035-8711 (print); 1365-2966 (online)DOI
10.1093/mnras/stac105Project
Gobierno de España. PGC2018-094975-B-C21Editor's Version
https://doi.org/10.1093/mnras/stac105Subjects
Galaxies: Bar; Galaxies: Evolution; Galaxies: Formation; Galaxies: Kinematics and Dynamics; Galaxies: Spiral; Local Group; FísicaNote
This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Monthly Notices of the Royal Astronomical Society 511.2 (2022): 2423-2433 is available online at: https://academic.oup.com/mnras/article-abstract/511/2/2423/6509499#no-access-messageRights
© 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical SocietyAbstract
More than 50 per cent of present-day massive disc galaxies show a rotating stellar bar. Their formation and dynamics have been widely studied both numerically and observationally. Although numerical simulations in the Lambda cold dark matter (ΛCDM) cosmological framework predict the formation of such stellar components, there seems to be a tension between theoretical and observational results. Simulated bars are typically larger in size and have slower pattern speed than observed ones. We study the formation and evolution of barred galaxies, using two ΛCDM zoom-in hydrodynamical simulations of the CLUES project that follow the evolution of a cosmological Local Group-like volume. We found that our simulated bars, at z = 0, are both shorter and faster rotators than previous ones found in other studies on cosmological simulations alleviating the tension mentioned above. These bars match the short tail-end of the observed bar-length distribution. In agreement with previous numerical works, we find that bars form in those systems where the disc self-gravity is dominant over the dark matter halo, making them unstable against bar formation. Our bars developed in the last 3–4 Gyr until they achieve their current length and strength; as bars grow, their lengths increase while their rotation speeds decrease. Despite this slowdown, at redshift z = 0 their rotation speeds and size match well the observational data
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Google Scholar:Marioni, Ornela F.
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Abadi, Mario G.
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Gottlöber, Stefan
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Yepes Alonso, Gustavo
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