Exploring the outskirts of the EAGLE disc galaxies

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dc.contributor.authorVarela-Lavin, Silvio
dc.contributor.authorTissera, Patricia B.
dc.contributor.authorGomez, Facundo A.
dc.contributor.authorBignone, Lucas A.
dc.contributor.authorLagos, Claudia del P.
dc.date.accessioned2025-01-20T21:04:36Z
dc.date.available2025-01-20T21:04:36Z
dc.date.issued2022
dc.description.abstractObservations show that the surface brightness of disc galaxies can be well-described by a single exponential (TI), up-bending (TIII), or down-bending (TII) profiles in the outskirts. Here we characterize the mass surface densities of simulated late-type galaxies from the eagle project according to their distribution of mono-age stellar populations, the star formation activity, and angular momentum content. We find a clear correlation between the inner scale lengths and the stellar spin parameter, lambda, for all three disc types with lambda > 0.35. The outer scale lengths of TII and TIII discs show a positive trend with lambda, albeit weaker for the latter. TII discs prefer fast rotating galaxies. With regards to the stellar age distribution, negative and U-shape age profiles are the most common for all disc types. Positive age profiles are determined by a more significant contribution of young stars in the central regions, which decrease rapidly in the outer parts. TII discs prefer relative higher contributions of old stars compared to other mono-age populations across the discs whereas TIII discs become progressively more dominated by intermediate age (2-6 Gyr) stars for increasing radius. The change in slope of the age profiles is located after the break of the mass surface density. We find evidence of larger flaring for the old stellar populations in TIII systems compared to TI and TII, which could indicate the action of other processes. Overall, the relative distributions of mono-age stellar populations and the dependence of the star formation activity on radius are found to shape the different disc types and age profiles.
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stac1536
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stac1536
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/93251
dc.identifier.wosidWOS:000822440000004
dc.issue.numero4
dc.language.isoen
dc.pagina.final5354
dc.pagina.inicio5340
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectgalaxies: evolution
dc.subjectgalaxies: formation
dc.subjectgalaxies: stellar content
dc.titleExploring the outskirts of the EAGLE disc galaxies
dc.typeartículo
dc.volumen514
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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