Two fossil groups of galaxies at z~0.4 in the COSMOS: accelerated stellar-mass build-up, different progenitors

D Pierini,S Giodini,A Finoguenov,Hans Boehringer,Elena Donghia,G W Pratt, J Democles,M Pannella,Stefano Zibetti,Filiberto G Braglia,M Verdugo,F Ziparo,Anton M Koekemoer,M Salvato

Monthly Notices of the Royal Astronomical Society（2011）

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摘要

We report on two fossil groups of galaxies at redshifts z= 0.425 and 0.372 discovered in the Cosmic Evolution Survey (COSMOS) area. Selected as X-ray extended sources, they have total masses (M200) equal to 1.9(±0.41) × 1013 and 9.5(±0.42) × 1013 M⊙, respectively, as obtained from a recent X-ray luminosity–mass scaling relation. The lower mass system appears isolated, whereas the other sits in a w...

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关键词

galaxies: evolution,galaxies: groups: general,galaxies: luminosity function,mass function,X-rays: galaxies: clusters

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