The Evolution of the Stellar Mass Function of Galaxies from z=4: Evidence for Mass-Dependent Evolution – Niels Bohr Institute - University of Copenhagen

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Niels Bohr Institute > Calendar > 2009 > Talk given by Danilo M...

The Evolution of the Stellar Mass Function of Galaxies from z=4: Evidence for Mass-Dependent Evolution

Danilo Marchesini, Yale University, Astronomy Dept.

Abstract:
I will present the evolution of the stellar mass function (SMF) of galaxies from z=4.0 to z=1.3  measured from a sample constructed from the deep NIR MUSYC, the FIRES, and the GOODS-CDFS surveys, all having very high-quality optical to mid-infrared data. I provide, for the first time, a comprehensive analysis of random and systematic uncertainties affecting the derived SMFs, including sample variance, the uncertainties due to photometric redshift errors, and the systematic uncertainties due to different SED-modeling assumptions. Drammatic evolution of the SMF is observed from z=4 to z=0. The evolution appears to be mostly driven by a change in the normalization Phi*, but evidence for evolution in the shape of the SMF are also found, with the low-mass end evolving more rapidly than the high-mass end. The observed SMFs are compared to the SMFs predicted from theoretical models. I will conclude by presenting and showing some  preliminary results of the NEWFIRM Medium-Band Survey, a new NOAO/Yale survey aiming at dramatically improving the accuracy of photometric redshifts in the range 1.5<3.5.

Danilo Marchesini