Mass Selection and the Evolution of the Morphology‐Density Relation fromz= 0.8 to 0
| Autor: | K.-V. Tran, A. van der Wel, Andrew Zirm, Marc Postman, D. D. Kelson, G. D. Illingworth, Piero Rosati, Dan Magee, Holland C. Ford, R. Demarco, B. Holden, John P. Blakeslee, Nicole Homeier, M. Franx |
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| Rok vydání: | 2007 |
| Předmět: |
Morphology (linguistics)
clusters : general [galaxies] COMA CLUSTER X-RAY DATA FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics STAR-FORMATION cD Luminosity CLUSTER CL 1358+62 Hubble space telescope COLOR-MAGNITUDE RELATION Cluster (physics) EARLY-TYPE GALAXIES Astrophysics::Galaxy Astrophysics Physics CCD SURFACE PHOTOMETRY Astrophysics (astro-ph) Sigma Astronomy and Astrophysics HUBBLE-SPACE-TELESCOPE Galaxy Redshift Physics and Astronomy evolution galaxies : fundamental parameters [galaxies] Space and Planetary Science Magnitude (astronomy) MEDIUM-SENSITIVITY SURVEY photometry [galaxies] DIGITAL SKY SURVEY elliptical and lenticular [galaxies] |
| Zdroj: | ASTROPHYSICAL JOURNAL |
| ISSN: | 1538-4357 0004-637X |
| Popis: | We examined the morphology-density relations for galaxy samples selected by luminosity and by mass in each of five massive X-ray clusters from z=0.023 to 0.83 for 674 spectroscopically-confirmed members. Rest-frame optical colors and visual morphologies were obtained primarily from Hubble Space Telescope images. Morphology-density relations (MDR) are derived in each cluster from a complete, luminosity-selected sample of 452 galaxies with a magnitude limit M_V < M^{*}_{V} + 1. The change in the early-type fraction with redshift matches previous work for massive clusters of galaxies. We performed a similar analysis, deriving MDRs for complete, mass-selected samples of 441 galaxies with a mass-limit of 10^{10.6} M_{\sun}. Our mass limit includes faint objects, the equivalent of =~1 mag below L^{*} for the red cluster galaxies, and encompasses =~70% of the stellar mass in cluster galaxies. The MDRs in the mass-selected sample at densities of Sigma > 50 galaxies Mpc^{-2} are similar to those in the luminosity-selected sample but show larger early-type fractions. However, the trend with redshift in the fraction of elliptical and S0 galaxies with masses > 10^{10.6} M_{\sun} differs significantly between the mass- and luminosity-selected samples. The clear trend seen in the early-type fraction from z=0 to z=~ 0.8 is not found in mass-selected samples. The early-type galaxy fraction changes much less, and is consistent with being constant at 92% +/- 4% at ��> 500 galaxies Mpc^{-2} and 83 +/- 3% at 50 < ��< 500 galaxies Mpc^{-2}. This suggests that galaxies of mass lower than > 10^{10.6} M_{\sun} play a significant role in the evolution of the early-type fraction in luminosity-selected samples. (Abstract abridged) 18 pages in emulate ApJ format, with 10 color figures, Accepted to ApJ. Version updated to reflect published version, includes new references and a correction to table 3 |
| Databáze: | OpenAIRE |
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