Compact Massive Early-type galaxies in the z = 1.2 cluster RDCS1252.9-2927

Details Compact Massive Early-type galaxies in the z = 1.2 cluster RDCS1252.9-2927 Compact Massive Early-type galaxies in the z = 1.2 cluster RDCS1252.9-2927

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1111..183r&link_type=abstract

PROBING STELLAR POPULATIONS OUT TO THE DISTANT UNIVERSE: CEFALU 2008, Proceedings of the International Conference. AIP Conferen

Mathematics

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1

Galaxy Clusters, Origin, Formation, Evolution, Age, And Star Formation, Photometric, Polarimetric, And Spectroscopic Instrumentation

Scientific paper

We derive stellar masses and sizes of massive early-type galaxies in the z = 1.237 RDCS1252.9-2927 cluster and compare them with those measured in a similarly mass-selected sample of field contemporaries drawn from the GOODS South Field. Robust estimates of these parameters are obtained by comparing a large grid of composite stellar population models with 8-9 band photometry in the rest-frame NUV, optical and IR, thus sampling the entire relevant domain of emission of the different stellar populations. We also analyze the morphological properties of both samples to examine the dependence of their scaling relations on their mass and environment. We find that early-type galaxies, both in the cluster and in the field at z = 1.2, show analogous optical morphologies, follow comparable mass vs. size relation, have congruent average surface stellar mass densities and lie on the same Kormendy relation. We conclude that early-type galaxies must undergo a similar strong size evolution in both environments.

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