Galaxy and Mass Assembly (GAMA): probing the merger histories of massive galaxies via stellar populations

Simple item page
dc.contributor.authorFerreras, I.
dc.contributor.authorHopkins, A. M.
dc.contributor.authorGunawardhana, M. L. P.
dc.contributor.authorSansom, A. E.
dc.contributor.authorOwers, M. S.
dc.contributor.authorDriver, S.
dc.contributor.authorDavies, L.
dc.contributor.authorRobotham, A.
dc.contributor.authorTaylor, E. N.
dc.contributor.authorKonstantopoulos, I.
dc.contributor.authorBrough, S.
dc.contributor.authorNorberg, P.
dc.contributor.authorCroom, S.
dc.contributor.authorLoveday, J.
dc.contributor.authorWang, L.
dc.contributor.authorBremer, M.
dc.date.accessioned2025-01-23T21:26:10Z
dc.date.available2025-01-23T21:26:10Z
dc.date.issued2017
dc.description.abstractThe merging history of galaxies can be traced with studies of dynamically close pairs. These consist of a massive primary galaxy and a less massive secondary (or satellite) galaxy. The study of the stellar populations of secondary (lower mass) galaxies in close pairs provides a way to understand galaxy growth by mergers. Here we focus on systems involving at least one massive galaxy - with stellar mass above 10(11)M(circle dot) in the highly complete Galaxy and Mass Assembly (GAMA) survey. Our working sample comprises 2692 satellite galaxy spectra (0.1 <= z <= 0.3). These spectra are combined into high S/N stacks, and binned according to both an 'internal' parameter, the stellar mass of the satellite galaxy (i. e. the secondary), and an 'external' parameter, selecting either the mass of the primary in the pair, or the mass of the corresponding dark matter halo. We find significant variations in the age of the populations with respect to environment. At fixed mass, satellites around the most massive galaxies are older and possibly more metal-rich, with age differences similar to 1-2 Gyr within the subset of lower mass satellites (similar to 10(10) M-circle dot). These variations are similar when stacking with respect to the halo mass of the group where the pair is embedded. The population trends in the lower mass satellites are consistent with the old stellar ages found in the outer regions of massive galaxies.
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stx503
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stx503
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101347
dc.identifier.wosidWOS:000398419200045
dc.issue.numero1
dc.language.isoen
dc.pagina.final619
dc.pagina.inicio607
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectgalaxies: evolution
dc.subjectgalaxies: formation
dc.subjectgalaxies: interactions
dc.subjectgalaxies: stellar content
dc.titleGalaxy and Mass Assembly (GAMA): probing the merger histories of massive galaxies via stellar populations
dc.typeartículo
dc.volumen468
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
Files
Collections
Artículos de revistas