Stellar Abundances at the Center of Early-type Galaxies with Fine Structure

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dc.contributor.authorBarth, Nicholas
dc.contributor.authorPrivon, George C.
dc.contributor.authorEzzeddine, Rana
dc.contributor.authorEvans, Aaron S.
dc.contributor.authorTreister, Ezequiel
dc.date.accessioned2025-01-20T16:15:08Z
dc.date.available2025-01-20T16:15:08Z
dc.date.issued2024
dc.description.abstractOur understanding of early-type galaxies (ETGs) has grown in the past decade with the advance of full-spectrum fitting techniques used to infer the properties of the stellar populations that make up the galaxy. We present ages, central velocity dispersions, and abundance ratios relative to Fe of C, N, O, Mg, Si, Ca, Ti, Cr, Mn, Co, Ni, Cu, Sr, Ba, and Eu, derived using full-spectrum fitting techniques for three ETGs, NGC 2865, NGC 3818, and NGC 4915. Each of these three galaxies were selected because they have optical, disturbed structures (fine structure) that are linked to major merger events that occurred 1, 7, and 6 Gyr ago, respectively. Two of the ETGs, NGC 3818 and NGC 4915, show chemical signatures similar to ETGs without fine structure, which is consistent with a gas-poor merger of elliptical galaxies in which substantial star formation is not expected. For NGC 2865, we find a statistically higher abundance of Ca (an alpha element) and Cr and Mn (Fe-peak elements). We show that for NGC 2865, a simple gas-rich merger scenario fails to explain the larger abundance ratios compared to ETGs without fine structure. These three ETGs with fine structure exhibit a range of abundances, suggesting ETGs with fine structure can form via multiple pathways and types of galaxy mergers.
dc.fuente.origenWOS
dc.identifier.doi10.3847/1538-4357/ad41b5
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.3847/1538-4357/ad41b5
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90478
dc.identifier.wosidWOS:001250782700001
dc.issue.numero2
dc.language.isoen
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.titleStellar Abundances at the Center of Early-type Galaxies with Fine Structure
dc.typeartículo
dc.volumen968
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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