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Line-strength indices in bright spheroidal galaxies: Evidence for a stellar population dichotomy between spheroidal and elliptical galaxies

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dc.contributor.authorGorgas García, Francisco Javier
dc.contributor.authorPedraz, Santos
dc.contributor.authorGuzmán, Rafael
dc.contributor.authorCardiel López, Nicolás
dc.contributor.authorGonzález, J. J.
dc.date.accessioned2023-06-20T19:20:10Z
dc.date.available2023-06-20T19:20:10Z
dc.date.issued1997-05-20
dc.description© 1997. The American Astronomical Society. All rights reserved. We are grateful to the anonymous referee, A. Aragón Salamanca, J. Gallego, and R. Peletier for useful comments. The INT is operated on the island of La Palma by the RGO at the Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. This work was supported in part by the Spanish grant PB93-456. R. G. acknowledges funding from the Spanish MEC fellowship EX93-27295297 and NSF grant AST91-20005.
dc.description.abstractWe present new measurements of central line-strength indices (namely, Mg-2, (Fe), and H beta) and gradients for a sample of six bright spheroidal (Sph) galaxies in the Virgo Cluster. Comparison with similar measurements for elliptical (E) galaxies, galactic globular clusters (GGCs), and stellar population models yield the following results: (1) in contrast with bright E galaxies, bright Sph galaxies are consistent with solar abundance [Mg/Fe] ratios; (2) bright Sph galaxies exhibit metallicities ranging from values typical for metal-rich GGCs to those for E galaxies; (3) although absolute mean ages are quite model dependent, we find evidence that the stellar populations of some (if not all) Sph galaxies look significantly younger than GCCs; and (4) Mg-2 gradients of bright Sph galaxies are significantly shallower than those of E galaxies. We conclude that the dichotomy found in the structural properties of Sph and E galaxies is also observed in their stellar populations. A tentative interpretation in terms of differences in star formation histories is suggested.
dc.description.departmentDepto. de Física de la Tierra y Astrofísica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipSpanish MEC
dc.description.sponsorshipNSF
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/29955
dc.identifier.doi10.1086/310647
dc.identifier.issn0004-637X
dc.identifier.officialurlhttp://dx.doi.org/10.1086/310647
dc.identifier.relatedurlhttp://iopscience.iop.org/
dc.identifier.urihttps://hdl.handle.net/20.500.14352/59538
dc.issue.number1
dc.journal.titleAstrophysical journal
dc.language.isoeng
dc.page.finalL22
dc.page.initialL19
dc.publisherIOP Publishing
dc.relation.projectIDPB93-456
dc.relation.projectIDEX93-27295297
dc.relation.projectIDAST91-20005
dc.rights.accessRightsopen access
dc.subject.cdu52
dc.subject.keywordGalactic globular-clusters
dc.subject.keywordDwarf galaxies
dc.subject.keywordVirgo cluster
dc.subject.keywordGradients
dc.subject.ucmAstrofísica
dc.subject.ucmAstronomía (Física)
dc.titleLine-strength indices in bright spheroidal galaxies: Evidence for a stellar population dichotomy between spheroidal and elliptical galaxies
dc.typejournal article
dc.volume.number481
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