Excursions into the Evolution of Early-Type Galaxies in Clusters
نویسندگان
چکیده
Recent observations have revealed that early-type galaxies (ETG) in clusters comprise an old galaxy population that is evolving passively. We review some recent observations from the ground and from the HST that show that ETG have undergone a significant amount of luminosity evolution. This evolution is traced by two projections of the fundamental plane (FP): the size-magnitude relation (SMR) and the color-magnitude relation (CMR). We will briefly discuss the relevance of all these results in the context of the universality of the IMF. Fulbright Visiting Scholar at the Observatories of the Carnegie Institution of Washington (OCIW) Carnegie Fellow, OCIW
منابع مشابه
Scaling relations in dynamical evolution of star clusters
We have carried out a series of small scale collisional N-body calculations of single-mass star clusters to investigate the dependence of the lifetime of star clusters on their initial parameters. Our models move through an external galaxy potential with a logarithmic density profile and they are limited by a cut-off radius. In order to find scaling relations between the lifetime of star cluste...
متن کاملFormation and Evolution of Galaxies in Clusters
Elliptical and S0 galaxies dominate the galaxy population in nearby rich clusters such as Coma. Studies of the evolution of the colors, massto-light ratios, and line indices of early-type galaxies indicate that they have been a highly homogeneous, slowly evolving population over the last ∼ 65% of the age of the Universe. On the other hand, recent evidence suggests that many early-type galaxies ...
متن کاملGalaxy Populations and Evolution in Clusters I: Dynamics and the Origin of Low-Mass Galaxies in the Virgo Cluster
Early-type dwarfs are the most common galaxy in the local universe, yet their origin and evolution remain a mystery. Various cosmological scenarios predict that dwarf-like galaxies in dense areas are the first to form and hence should be the oldest stellar systems in clusters. By using radial velocities of early-type dwarfs in the Virgo cluster we demonstrate that these galaxies are not an old ...
متن کاملThe Possible Precursors of z = 0 Cluster
We examine the distribution of stellar masses of galaxies in MS 1054.4-0321 and CL 0152.7-1357, two X-ray-selected clusters of galaxies at z = 0.83. Our stellar mass estimates, from spectral energy distribution fitting, reproduce the dynamical masses as measured from velocity dispersions and halflight radii with a scatter of 0.2 dex in the mass for early-type galaxies. When we restrict our samp...
متن کاملThe Age and Metallicity Range of Early-Type Galaxies in Clusters
We present an unbiased method for evaluating the ranges of ages and metallicities which are allowed by the photometric properties of the stellar populations that dominate the light of early-type galaxies in clusters. The method is based on the analysis of morphologically-classified early-type galaxies in 17 clusters at redshifts 0.3 ∼< z ∼< 0.9 and in the nearby Coma cluster using recent stella...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2002