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The stellar bar–dark matter halo connection in the TNG50 simulations

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dc.contributor.author Ansar, Sioree
dc.contributor.author Mousumi Das
dc.date.accessioned 2024-12-06T05:36:59Z
dc.date.available 2024-12-06T05:36:59Z
dc.date.issued 2024-11-10
dc.identifier.citation The Astrophysical Journal, Vol. 975, No. 2, 243 en_US
dc.identifier.issn 1538-4357
dc.identifier.uri http://hdl.handle.net/2248/8607
dc.description Open Access en_US
dc.description Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI
dc.description.abstract Stellar bars in disk galaxies grow as stars in near-circular orbits lose angular momentum to their environments, including their dark matter (DM) halo, and transform into elongated bar orbits. This angular momentum exchange during galaxy evolution hints at a connection between bar properties and the DM halo spin λ, the dimensionless form of DM angular momentum. We investigate the connection between halo spin λ and galaxy properties in the presence/absence of stellar bars, using the cosmological magnetohydrodynamic TNG50 simulations at multiple redshifts (0 < zr < 1). We determine the bar strength (or bar amplitude, A2/A0), using Fourier decomposition of the face-on stellar density distribution. We determine the halo spin for barred and unbarred galaxies (0 < A2/A0 < 0.7) in the center of the DM halo, close to the galaxy's stellar disk. At zr = 0, there is an anticorrelation between halo spin and bar strength. Strongly barred galaxies (A2/A0 > 0.4) reside in DM halos with low spin and low specific angular momentum at their centers. In contrast, unbarred/weakly barred galaxies (A2/A0 < 0.2) exist in halos with higher central spin and higher specific angular momentum. The anticorrelation is due to the barred galaxies' higher DM mass and lower angular momentum than the unbarred galaxies at zr = 0, as a result of galaxy evolution. At high redshifts (zr = 1), all galaxies have higher halo spin compared to those at lower redshifts (zr = 0), with a weak anticorrelation for galaxies having A2/A0 > 0.2. The formation of DM bars in strongly barred systems highlights how angular momentum transfer to the halo can influence its central spin. en_US
dc.language.iso en en_US
dc.publisher American Astronomical Society en_US
dc.relation.uri https://doi.org/10.3847/1538-4357/ad7a6b
dc.rights © 2024. The Author(s)
dc.subject Galaxy dark matter halos en_US
dc.subject Galaxy bars en_US
dc.subject Hydrodynamical simulations en_US
dc.title The stellar bar–dark matter halo connection in the TNG50 simulations en_US
dc.type Article en_US


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