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- W4386390362 abstract "Boxy/peanut (b/p) bulges, the vertically extended inner part of a bar, are ubiquitous in barred disc galaxies in the local Universe, including our own Milky Way. A majority of external galaxies and the Milky Way also possess a thick-disc. However, the dynamical effect of thick-discs in the b/p formation and evolution is not fully understood. Here, we investigate the effect of thick-discs in the formation and evolution of b/p by using a suite of $N$-body models of (kinematically cold) thin and (kinematically hot) thick discs. Within the suite of models, we systematically vary the mass fraction of the thick disc, and the thin-to-thick disc scale length ratio. This allows one to examine the b/p formation in discs with different ratios of cold and hot disc components. The b/ps form in almost all our models via a vertical buckling instability, even in the presence of a massive thick disc. The thin disc b/p is much stronger than the thick disc b/p. With increasing thick disc mass fraction, the final b/p structure gets progressively weaker in strength and larger in extent. Furthermore, the time-interval between the bar formation and the onset of buckling instability gets progressively shorter with increasing thick-disc mass fraction. These trends remain true for all three geometric configurations considered here. The breaking and restoration of the vertical symmetry (during and after the b/p formation) show a spatial variation -- the inner bar region restores vertical symmetry rather quickly (after the buckling) while in the outer bar region, the vertical asymmetry persists long after the buckling happens. Our findings also predict that at higher redshifts, when discs are thought to be thicker, b/ps would have more `boxy-shaped' appearance than more `X-shaped' appearance. This remains to be tested from future observations at higher redshifts." @default.
- W4386390362 created "2023-09-03" @default.
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- W4386390362 date "2023-08-30" @default.
- W4386390362 modified "2023-09-27" @default.
- W4386390362 title "Bars and boxy/peanut bulges in thin and thick discs III. Boxy/peanut bulge formation and evolution in presence of thick discs" @default.
- W4386390362 doi "https://doi.org/10.48550/arxiv.2308.16239" @default.
- W4386390362 hasPublicationYear "2023" @default.
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