Photometric Redshifts and Stellar Mass Assembly in the 2-deg^2 COSMOS Field

Details Photometric Redshifts and Stellar Mass Assembly in the 2-deg^2 COSMOS Field Photometric Redshifts and Stellar Mass Assembly in the 2-deg^2 COSMOS Field

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..399..169i&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

2

Scientific paper

We measure the stellar mass function per type from z˜ 0.2 out to z˜ 2 in the 2-deg^2 COSMOS field. We base our measurement on much improved photometric redshifts computed with 30 bands. Comparison of the derived photo-z with 4148 spectroscopic redshifts indicates a dispersion of σ_{Δ z/(1+z)}=0.007 at i^+_{AB}<22.5. We measure the stellar mass function of different galaxy types based on 230,000 galaxies selected at F_{3.6μ m}> 1 μ Jy. We observe a increase in density of the low mass ellipticals with times ; a rapid mass assembly of massive ellipticals from z=2 out z=1 which slows down at z<1 ; a mild evolution of the stellar mass density for the star-forming galaxies which indicates that a significant fraction of them is transformed into quiescent galaxies.

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