Galaxy Down-Sizing: A Tough Challenge for the Hierarchical Universe?

Details Galaxy Down-Sizing: A Tough Challenge for the Hierarchical Universe? Galaxy Down-Sizing: A Tough Challenge for the Hierarchical Universe?

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..399..139b&link_type=abstract

Panoramic Views of Galaxy Formation and Evolution ASP Conference Series, Vol. 399, proceedings of the conference held 11-16 Dece

Astronomy and Astrophysics

Astronomy

Scientific paper

Observartional astronomers, claim that the visible universe is defined by galaxy "down-sizing", and that the formation of galaxies is "anti-hierarchical". At first sight, this seems to contradict the "heirarchical" formation of structure that is a key component of the ΛCDM paradigm. In this talk I will briefly review what these terms mean and why there has historically been such conflict between observational and theoretical views of the universe. I will discuss how this paradox has evaporated in recent galaxy formation models, largely due to the regulation of galaxy formation by "radio-mode" accretion onto black-holes.

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