2003ApJ...594L...9F -
Astrophys. J., 594, L9-L12 (2003/September-1)
The assembly of massive galaxies from near-infrared observations of the Hubble Deep Field-South.
FONTANA A., DONNARUMMA I., VANZELLA E., GIALLONGO E., MENCI N., NONINO M., SARACCO P., CRISTIANI S., D'ODORICO S. and POLI F.
Abstract (from CDS):
We use a deep KAB≤25 galaxy sample in the Hubble Deep Field-South to trace the evolution of the cosmological stellar mass density from z≃0.5 to z≃3. We find clear evidence for a decrease of the average stellar mass density at high redshift, 2≤z≤3.5, that is 15+25–5% of the local value, 2 times higher than observed in the Hubble Deep Field-North. To take into account for the selection effects, we define a homogeneous subsample of galaxies with 1010 M☉≤M*≤1011 M☉: in this sample, the mass density at z>2 is 20+20–5% of the local value. In the mass-limited subsample at z>2, the fraction of passively fading galaxies is at most 25%, although they can contribute up to about 40% of the stellar mass density. On the other hand, star-forming galaxies at z>2 form stars with an average specific rate of at least M{dot}/M*≃4x10–10 yr–1, 3 times higher than the z≤1 value. This implies that UV-bright star-forming galaxies are substancial contributors to the rise of the stellar mass density with cosmic time. Although these results are globally consistent with Λ-CDM scenarios, the present rendition of semianalytic models fails to match the stellar mass density produced by more massive galaxies present at z>2.
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Journal keyword(s):
Galaxies: Evolution - Galaxies: Formation - Galaxies: High-Redshift
Simbad objects:
3
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