%0 Journal Article
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%@nexthigherunit 8JMKD3MGPCW/3ETR8EH
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%@resumeid 8JMKD3MGP5W/3C9JJ5B
%X The abundance ratios between key elements such as iron and -process elements carry a wealth of information on the star formation history (SFH) of galaxies. So far, simple chemical evolution models have linked [/Fe ] with the SFH time-scale, correlating large abundance ratios with short-lived SFH. The incorporation of full spectral fitting to the analysis of stellar populations allows for a more quantitative constraint between [/Fe ] and the SFH. In this letter, we provide, for the first time, an empirical correlation between [/Fe ] (measured from spectral indices) and the SFH (determined via a non-parametric spectral-fitting method). We offer an empirical version of the iconic outline of Thomas et al., relating star formation time-scale with galaxy mass, although our results suggest, in contrast, a significant population of old (≳10 Gyr) stars even for the lowest mass ellipticals (M/dyn ¡­ 3 ¡¿ 1010 M¢Á). In addition, the abundance ratio is found to be strongly correlated with the time to build up the stellar component, showing that the highest [/Fe ] (≳+0.2) are attained by galaxies with the shortest half-mass formation time (≲2 Gyr), or equivalently, with the smallest (≲40 per cent) fraction of populations younger than 10 Gyr. These observational results support the standard hypothesis that star formation incorporates the Fe-enriched interstellar medium into stars, lowering the high abundance ratio of the old populations.
%8 Sept
%N 1
%T The link between the star formation history and [α/Fe]
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%@electronicmailaddress rrdecarvalho2008@gmail.com
%@secondarytype PRE PI
%K galaxies: elliptical and lenticular, cD,galaxies: evolution,galaxies: formation,galaxies: stellar content,galaxies: structure.
%@usergroup administrator
%@usergroup lattes
%@usergroup secretaria.cpa@dir.inpe.br
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%@group DAS-CEA-INPE-MCT-BR
%@e-mailaddress rrdecarvalho2008@gmail.com
%F lattes: 7418724825594141 4 RosaLaBaFerrCarv:2011:LiThSt
%@issn 1745-3933
%2 dpi.inpe.br/plutao/2011/11.23.18.50.57
%@affiliation Instituto de Astrofísica de Canarias
%@affiliation INAF – Osservatorio Astronomico di Capodimonte
%@affiliation Mullard Space Science Laboratory, University College London
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%B Monthly Notices of the Royal Astronomical Society Letters
%@versiontype publisher
%P L74-L78
%4 dpi.inpe.br/plutao/2011/11.23.18.50.56
%@documentstage not transferred
%D 2011
%V 418
%@doi 10.1111/j.1745-3933.2011.01146.x
%A Rosa, Ignacio G. de la,
%A La Barbera, Francesco,
%A Ferreras, Ignacio,
%A Carvalho, Reinaldo Ramos de,
%@area CEA