English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/151645
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
DC FieldValueLanguage
dc.contributor.authorZibetti, S.es_ES
dc.contributor.authorAscasibar, Y.es_ES
dc.contributor.authorGarcía-Benito, Rubénes_ES
dc.contributor.authorKehrig, C.es_ES
dc.contributor.authorMárquez, Isabeles_ES
dc.contributor.authorWisotzki, L.es_ES
dc.identifier.citationMonthly Notices of the Royal Astronomical Society 468(2): 1902-1916 (2017)es_ES
dc.descriptionZibetti, S. et. al.es_ES
dc.description.abstractGalaxies in the local Universe are known to follow bimodal distributions in the global stellar population properties. We analyse the distribution of the local average stellar population ages of 654 053 sub-galactic regions resolved on similar to 1 kpc scales in a volume-corrected sample of 394 galaxies, drawn from the Calar Alto Legacy Integral Field Area (CALIFA) DR3 integral-field- spectroscopy survey and complemented by Sloan Digital Sky Survey (SDSS) imaging. We find a bimodal local-age distribution, with an old and a young peak primarily due to regions in early-type galaxies and star-forming regions of spirals, respectively. Within spiral galaxies, the older ages of bulges and interarm regions relative to spiral arms support an internal age bimodality. Although regions of higher stellar mass surface density, mu(*), are typically older, mu(*) alone does not determine the stellar population age and a bimodal distribution is found at any fixed mu(*). We identify an 'old ridge' of regions of age similar to 9 Gyr, independent of mu(*), and a 'young sequence' of regions with age increasing with mu(*) from 1-1.5 to 4-5 Gyr. We interpret the former as regions containing only old stars, and the latter as regions where the relative contamination of old stellar populations by young stars decreases as mu(*) increases. The reason why this bimodal age distribution is not inconsistent with the unimodal shape of the cosmic-averaged star formation history is that (i) the dominating contribution by young stars biases the age low with respect to the average epoch of star formation, and (ii) the use of a single average age per region is unable to represent the full time extent of the star formation history of ` young sequence' regions.es_ES
dc.description.sponsorshipSZ and ARG have been supported by the EU Marie Curie Career Integration Grant 'SteMaGE' Nr. PCIG12-GA-2012-326466 (Call Identifier: FP7-PEOPLE-2012 CIG). YA is financially supported by the Ramon y Cajal programme (contract RyC-2011-09461) and project AYA2016-79724-C4-1-P from the Spanish Mineco, as well as the exchange programme SELGIFS FP7-PEOPLE-2013-IRSES-612701 funded by the EU. SC acknowledges support from the European Research Council via an Advanced Grant under grant agreement no. 321323 (NEOGAL). LG was supported in part by the US National Science Foundation under Grant AST-1311862. RGB acknowledges support from grants P12-FQM-2828 of Junta de Andalucia and AYA2014-57490P from MINECO. AdLC acknowledges support from the CONACyT-125180, DGAPA-IA100815 and DGAPA-IA101217 projects. RAM acknowledges support by the Swiss National Science Foundation. IM acknowledges financial support from the grant AYA2013-42227-P from the Spanish Ministerio de Ciencia e Innovacion. SFS thanks the CONACYT-125180 and DGAPA-IA100815 projects. GvdV acknowledges partial support from Sonderforschungsbereich SFB 881 'The Milky Way System' (subproject A7 and A8) funded by the German Research Foundation.es_ES
dc.publisherOxford University Presses_ES
dc.relation.isversionofPublisher's versiones_ES
dc.subjectGalaxies: generales_ES
dc.subjectGalaxies: statisticses_ES
dc.subjectGalaxies: stellar contentes_ES
dc.subjectGalaxies: structurees_ES
dc.titleResolving the age bimodality of galaxy stellar populations on kpc scaleses_ES
dc.description.peerreviewedPeer reviewedes_ES
dc.contributor.funderEuropean Commissiones_ES
dc.contributor.funderMinisterio de Economía y Competitividad (España)es_ES
dc.contributor.funderEuropean Research Counciles_ES
dc.contributor.funderNational Science Foundation (US)es_ES
dc.contributor.funderJunta de Andalucíaes_ES
dc.contributor.funderSwiss National Science Foundationes_ES
dc.contributor.funderMinisterio de Ciencia e Innovación (España)es_ES
dc.contributor.funderGerman Research Foundationes_ES
dc.contributor.funderComisión Nacional de Investigación Científica y Tecnológica (Chile)es_ES
oprm.item.hasRevisionno ko 0 false*
Appears in Collections:(IAA) Artículos
Files in This Item:
File Description SizeFormat 
IAA_2017_MNRASstx251.pdf5,06 MBAdobe PDFThumbnail
Show simple item record

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.