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Titolo:
The evolution of the galactic morphological types in clusters
Autore:
Fasano, G; Poggianti, BM; Couch, WJ; Bettoni, D; Kjaergaard, P; Moles, M;
Indirizzi:
Astron Observ Padova, I-35122 Padua, Italy Astron Observ Padova Padua Italy I-35122 rv Padova, I-35122 Padua, Italy Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia Univ New S Wales Sydney NSW Australia 2052 s, Sydney, NSW 2052, Australia Univ Copenhagen, Astron Observ, DK-2100 Copenhagen, Denmark Univ Copenhagen Copenhagen Denmark DK-2100 , DK-2100 Copenhagen, Denmark CSIC, Inst Matemat & Fis Fundamental, E-28006 Madrid, Spain CSIC Madrid Spain E-28006 temat & Fis Fundamental, E-28006 Madrid, Spain
Titolo Testata:
ASTROPHYSICAL JOURNAL
fascicolo: 2, volume: 542, anno: 2000,
parte:, 1
pagine: 673 - 683
SICI:
0004-637X(20001020)542:2<673:TEOTGM>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOTOMETRIC STANDARD STARS; EARLY-TYPE GALAXIES; DISTANT CLUSTERS; RICH CLUSTERS; FUNDAMENTAL PLANE; HST OBSERVATIONS; REDSHIFT; CLASSIFICATION; POPULATIONS; CATALOG;
Keywords:
galaxies : clusters : general; galaxies : evolution; galaxies : structure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Fasano, G Astron Observ Padova, Vicolo Osservat 5, I-35122 Padua, Italy Astron Observ Padova Vicolo Osservat 5 Padua Italy I-35122 taly
Citazione:
G. Fasano et al., "The evolution of the galactic morphological types in clusters", ASTROPHYS J, 542(2), 2000, pp. 673-683

Abstract

The morphological types of galaxies in nine clusters in the redshift range0.1 less than or similar to z less than or similar to 0.25 are derived from very good seeing images taken at the NOT and the La Silla-Danish telescopes, with all galaxies at M-V < -20 and within the central <similar to> 1 Mpc(2) area being classified. With the purpose of investigating the evolutionof the fraction of different morphological types with redshift, we compareour results with the morphological content of nine distant clusters studied by the MORPHS group, five clusters observed with HST/WFPC2 at redshift z = 0.2-0.3, and Dressier's large sample of nearby clusters. After having checked the reliability of our morphological classification both in an absolute sense and relative to the MORPHS scheme, we analyze the relative occurrence of elliptical, S0, and spiral galaxies as a function of the cluster properties and redshift. We find a large intrinsic scatter in the S0/E ratio, mostly related to the cluster morphology. In particular, in our cluster sample, clusters with a high concentration of ellipticals display a low S0/E ratio and, vice versa, low concentration clusters have a high S0/E. At the same time, the trend of the morphological fractions (%E's, %S0's, %Sp's) and of the S0/E and S0/Sp ratios with redshift clearly points to a morphological evolution: as the redshift decreases, the S0 population tends to grow at the expense of the spiral population, whereas the frequency of E's remains almost constant. We also analyze the morphology-density (MD) relation in our dusters and find that-similarly to higher redshift clusters-a good MD relation exists in the high-concentration clusters, while it is absent in the less concentrated clusters. Finally, the comparison of the MD relation in our clusters with that of the MORPHS sample suggests that the transformationof spirals into S0 galaxies becomes more efficient with decreasing local density.

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Documento generato il 30/11/20 alle ore 00:31:44