The Many Manifestations of Downsizing: Hierarchical Models Confront Observations

Details The Many Manifestations of Downsizing: Hierarchical Models Confront Observations The Many Manifestations of Downsizing: Hierarchical Models Confront Observations

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1240..327f&link_type=abstract

HUNTING FOR THE DARK: THE HIDDEN SIDE OF GALAXY FORMATION. Edited by Victor P. Debattista and Cristina C. Popescu AIP Conferen

Physics

Galaxies, Red Shift, Dark Matter, Stellar Mass, Star Formation, Origin, Formation, Evolution, Age, And Star Formation, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies, Dark Matter, Masses, Star Formation

Scientific paper

We compare the prediction of three different semi-analytical models for the formation and evolution of galaxies in the standard ΛCDM cosmology with the available evidences in favor of the so-called ``downsized'' scenario. Our results suggest that the strongest discrepancies with model predictions are related with the very efficient formation of intermediate-to-low mass galaxies (M*~109-1011Msolar): these objects form too early (z~2-3), are too passive at intermediate redshift and host stellar populations which are too old at z ~0. We then discuss the possible physical origin of this tension between models and observations.

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