Estimating the Stellar Masses in 30000 Galaxies with Redshifts Below 1.0

Abstract

We present a new method of constraining the star formation histories and hence the stellar M/L ratios by using the multicolor technique in COMBO-17 [7]. It estimates the stellar M/L ratio at the observed wavelength λ = 815 nm for each single galaxy on the basis of color information from 5 broadband and 12 medium band filters. The 815 nm mass estimations are in very good agreement to the masses derived from public J, H and K _s data from the ESO Imaging survey [4] in a tiny area (5% of one of our fields). The stellar mass distribution in the range 0.1<z<0.3 is compared to the result of Kauffmann et al. [5] for SDSS galaxies and shows a good agreement. Considering only galaxies with M > 3 × 10⁹ M_⊙, we find that the integrated stellar mass density in galaxies increased by a factor of about 1.5 since redshift 1.0.

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