Lopsidedness as a tracer of early galactic assembly history

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dc.contributor.authorDolfi, Arianna
dc.contributor.authorGomez, Facundo A.
dc.contributor.authorMonachesi, Antonela
dc.contributor.authorVarela-Lavin, Silvio
dc.contributor.authorTissera, Patricia B.
dc.contributor.authorSifon, Cristobal
dc.contributor.authorGalaz, Gaspar
dc.date.accessioned2025-01-20T17:18:34Z
dc.date.available2025-01-20T17:18:34Z
dc.date.issued2023
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.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stad2650
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stad2650
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/91389
dc.identifier.wosidWOS:001143760100022
dc.issue.numero1
dc.language.isoen
dc.pagina.final584
dc.pagina.inicio567
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectgalaxies: evolution
dc.subjectgalaxies: formation
dc.subjectgalaxies: interactions
dc.subjectgalaxies: star formation
dc.subjectgalaxies: structure
dc.titleLopsidedness as a tracer of early galactic assembly history
dc.typeartículo
dc.volumen526
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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