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Evolution of the Early-Type Galaxy Fraction in Clusters since z = 0.8 by Simard, Luc; Clowe, Douglas; Desai, Vandana; Dalcanton, Julianne J.; von der Linden, Anja; Poggianti, Bianca M.; White, Simon D. M.; Aragon-Salamanca, Alfonso; De Lucia, Gabriella; Halliday, Claire; Jablonka, Pascale; Milvang-Jensen, Bo; Saglia, Roberto P.; Pello, Roser; Rudnick, Gregory H.; Zaritsky, Dennis is a scholarly article available to read on EtoBox.

What is Evolution of the Early-Type Galaxy Fraction in Clusters since z = 0.8 about?

We study the morphological content of a large sample of high-redshift clusters to determine its dependence on cluster mass and redshift. Quantitative morphologies are based on bulge+disk decompositions of cluster and field galaxies on deep VLT/FORS2 images of 18 optically-selected clusters at 0.45 < z < 0.80 from the ESO Distant Cluster Survey (EDisCS). Morphological content is given by the early-type galaxy fraction f_et, and early-type galaxies are selected based on their bulge fraction and image smoothness. A set of 158 SDSS clusters is analyzed exactly as the EDisCS sample to provide a robust local comparison. Our main results are: (1) f_et values for the SDSS and EDisCS clusters exhibit no clear trend as a function of sigma. (2) Mid-z EDisCS clusters around sigma = 500 km/s have f_et ~= 0.5 whereas high-z EDisCS clusters have f_et ~= 0.4 (~25% increase over 2 Gyrs). (3) There is a marked difference in the morphological content of EDisCS and SDSS clusters. None of the EDisCS clusters have f_et greater than 0.6 whereas half of the SDSS clusters lie above this value. This difference is seen in clusters of all velocity dispersions. (4) There is a strong correlation between morphol

Author

Simard, Luc; Clowe, Douglas; Desai, Vandana; Dalcanton, Julianne J.; von der Linden, Anja; Poggianti, Bianca M.; White, Simon D. M.; Aragon-Salamanca, Alfonso; De Lucia, Gabriella; Halliday, Claire; Jablonka, Pascale; Milvang-Jensen, Bo; Saglia, Roberto P.; Pello, Roser; Rudnick, Gregory H.; Zaritsky, Dennis

Published

2009

Language

EN