%0 Journal Article
%@holdercode {isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S}
%@nexthigherunit 8JMKD3MGPCW/3ETR8EH
%@archivingpolicy denypublisher denyfinaldraft
%@issn 0004-6256
%X We present an analysis of stellar population gradients in 4,546 Early-Type Galaxies with photometry in $grizYHJK$ along with optical spectroscopy. A new approach is described which utilizes color information to constrain age and metallicity gradients. Defining an effective color gradient, $\nabla_{\star}$, which incorporates all of the available color indices, we investigate how $\nabla_{\star}$ varies with galaxy mass proxies, i.e. velocity dispersion, stellar (M_star) and dynamical (M_dyn) masses, as well as age, metallicity, and alpha/Fe. ETGs with M_dyn larger than 8.5 x 10^10, M_odot have increasing age gradients and decreasing metallicity gradients wrt mass, metallicity, and enhancement. We find that velocity dispersion and alpha/Fe are the main drivers of these correlations. ETGs with 2.5 x 10^10 M_odot =< M_dyn =< 8.5 x 10^10 M_odot, show no correlation of age, metallicity, and color gradients wrt mass, although color gradients still correlate with stellar population parameters, and these correlations are independent of each other. In both mass regimes, the striking anti-correlation between color gradient and alpha-enhancement is significant at \sim 4sigma, and results from the fact that metallicity gradient decreases with alpha/Fe. This anti-correlation may reflect the fact that star formation and metallicity enrichment are regulated by the interplay between the energy input from supernovae, and the temperature and pressure of the hot X-ray gas in ETGs. For all mass ranges, positive age gradients are associated with old galaxies (>5-7 Gyr). For galaxies younger than \sim 5 Gyr, mostly at low-mass, the age gradient tends to be anti-correlated with the Age parameter, with more positive gradients at younger ages.
%@mirrorrepository sid.inpe.br/mtc-m19@80/2009/08.21.17.02.53
%8 Nov.
%T SPIDER - IV. Optical and NIR color gradients in Early-type galaxies: New Insights into Correlations with Galaxy Properties
%@secondarytype PRE PI
%@usergroup administrator
%@usergroup marciana
%@group
%@group DAS-CEA-INPE-MCT-BR
%3 1538-3881_140_5_1528.pdf
%@secondarykey INPE--PRE/
%@secondarymark A2_ASTRONOMIA_/_FÍSICA A1_ENGENHARIAS_III C_ENSINO_DE_CIÊNCIAS_E_MATEMATICA A1_INTERDISCIPLINAR A2_MATEMÁTICA_/_PROBABILIDADE_E_ESTATÍSTICA A1_QUÍMICA
%2 sid.inpe.br/mtc-m19/2011/01.07.16.17.18
%@affiliation INAF – Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, 80131 Napoli, Italy
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto de Astrofísica de Canarias (IAC), E-38200 La Laguna, Tenerife, Spain
%@affiliation University of Hawaii, Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USA
%@affiliation
%@affiliation Observat´orio do Valongo/UFRJ, Rio de Janeiro, Brazil
%B Astronomical Journal
%P 1528-1556
%4 sid.inpe.br/mtc-m19/2011/01.07.16.17
%D 2010
%V 140
%@doi 10.1088/0004-6256/140/5/1528
%A La Barbera, F.,
%A Carvalho, R. R. de,
%A Rosa, I. G. de la,
%A Gal, R. R.,
%A Swindle, R.,
%A Lopes, P. A. A.,
%@dissemination WEBSCI; PORTALCAPES.
%@area CEA