Early-type galaxies at z ~ 1.3. II. Masses and ages of early-type galaxies in different environments and their dependence on stellar population model assumptions

Download
  1. Get@NRC: Early-type galaxies at z ~ 1.3. II. Masses and ages of early-type galaxies in different environments and their dependence on stellar population model assumptions (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1088/0004-637X/732/1/12
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleThe Astrophysical Journal
ISSN0004-637X
Volume732
Issue1
Article number12
Pages12-1
Subjectgalaxies: clusters: individual (RX J0849+4452, RX J0848+4453); galaxies: elliptical and lenticular, cD; galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: photometry
AbstractWe have derived masses and ages for 79 early-type galaxies (ETGs) in different environments at z similar to 1.3 in the Lynx supercluster and in the GOODS/CDF-S field using multi-wavelength (0.6-4.5 mu m; KPNO, Palomar, Keck, Hubble Space Telescope, Spitzer) data sets. At this redshift the contribution of the thermally pulsing asymptotic giant branch (TP-AGB) phase is important for ETGs, and the mass and age estimates depend on the choice of the stellar population model used in the spectral energy distribution fits. We describe in detail the differences among model predictions for a large range of galaxy ages, showing the dependence of these differences on age. Current models still yield large uncertainties. While recent models from Maraston and Charlot & Bruzual offer better modeling of the TP-AGB phase with respect to less recent Bruzual & Charlot models, their predictions do not often match. The modeling of this TP-AGB phase has a significant impact on the derived parameters for galaxies observed at high redshift. Some of our results do not depend on the choice of the model: for all models, the most massive galaxies are the oldest ones, independent of the environment. When using the Maraston and Charlot & Bruzual models, the mass distribution is similar in the clusters and in the groups, whereas in our field sample there is a deficit of massive (M greater than or similar to 10(11) M(circle dot)) ETGs. According to those last models, ETGs belonging to the cluster environment host on average older stars with respect to group and field populations. This difference is less significant than the age difference in galaxies of different masses.
Publication date
PublisherIOP Publishing
LanguageEnglish
AffiliationNational Research Council Canada; NRC Herzberg Institute of Astrophysics
Peer reviewedYes
NPARC number19775298
Export citationExport as RIS
Report a correctionReport a correction
Record identifier4c328ebc-4f25-4430-8f6b-da8be994a1e8
Record created2012-04-05
Record modified2016-07-18
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)