Infant Galaxy Clusters at Low Redshifts? | Zendy

Yutaka Fujita | Zendy

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Infant Galaxy Clusters at Low Redshifts?

Author(s) -

Yutaka Fujita

Publication year - 2003

Publication title -

publications of the astronomical society of japan

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.99

H-Index - 110

eISSN - 2053-051X

pISSN - 0004-6264

DOI - 10.1093/pasj/55.3.598

Subject(s) - physics , astrophysics , galaxy cluster , galaxy group , astronomy , brightest cluster galaxy , lenticular galaxy , interacting galaxy , elliptical galaxy , galaxy groups and clusters , galaxy , population , peculiar galaxy , galaxy merger , galaxy formation and evolution , medicine , environmental health

The population and population composition of galaxies in galaxy clusters atpresent reflect the mass of the clusters and the mass growth of the galaxies inthe past. We investigate them for six clusters. We show that galaxies inmassive clusters stopped growing at redshifts of ~4. Moreover, we find thatsome small galaxy clusters (groups) have too many massive galaxies for theirapparent masses. One possibility is that these groups are much more massive andin a phase just before virialization. If this is the case, they should becalled `infant galaxy clusters' that will be matured clusters in the dynamicaltime-scale (~10^9 yrs).Comment: 11 pages, 3 figures, PASJ in pres

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