Lopsidedness as a tracer of early galactic assembly history

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dc.contributor.authorDolfi, Arianna, Gomez, Facundo A., Monachesi, Antonela, Varela-Lavin, Silvio, Tissera, Patricia B., Sifon, Cristobal, Galaz, Gaspar
dc.date.accessioned2024-11-27T21:50:37Z
dc.date.available2024-11-27T21:50:37Z
dc.date.issued2023/09/21
dc.description.abstractLarge-scale asymmetries (i.e. lopsidedness) are a common feature in the stellar density distribution of nearby disc galaxies both in low- and high-density environments. In this work, we characterize the present-day lopsidedness in a sample of 1435 disc-like galaxies selected from the TNG50 simulation. We find that the percentage of lopsided galaxies (10 percent-30 percent) is in good agreement with observations if we use similar radial ranges to the observations. However, the percentage (58 percent) significantly increases if we extend our measurement to larger radii. We find a mild or lack of correlation between lopsidedness amplitude and environment at z = 0 and a strong correlation between lopsidedness and galaxy morphology regardless of the environment. Present-day galaxies with more extended discs, flatter inner galactic regions, and lower central stellar mass density (i.e. late-type disc galaxies) are typically more lopsided than galaxies with smaller discs, rounder inner galactic regions, and higher central stellar mass density (i.e. early-type disc galaxies). Interestingly, we find that lopsided galaxies have, on average, a very distinct star formation history within the last 10 Gyr, with respect to their symmetric counterparts. Symmetric galaxies have typically assembled at early times (similar to 8-6 Gyr ago) with relatively short and intense bursts of central star formation, while lopsided galaxies have assembled on longer time-scales and with milder initial bursts of star formation, continuing building up their mass until z = 0. Overall, these results indicate that lopsidedness in present-day disc galaxies is connected to the specific evolutionary histories of the galaxies that shaped their distinct internal properties.
dc.identifier.doihttp://dx.doi.org/10.1093/mnras/stad2650
dc.identifier.issn0035-8711
dc.identifier.urihttps://publicacionesabiertas.userena.cl/handle/123456789/112
dc.languageEnglish
dc.publisherOXFORD UNIV PRESS
dc.subjectSIMULATING GALAXY FORMATION, ILLUSTRISTNG SIMULATIONS, SPIRAL GALAXIES, MORPHOLOGY, ASYMMETRY, EVOLUTION, CLUSTERS, NEARBY, DISKS, POPULATIONS
dc.titleLopsidedness as a tracer of early galactic assembly history
dc.typeArticle

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