期刊
ASTRONOMY & ASTROPHYSICS
卷 556, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201321100
关键词
galaxies: distances and redshifts; galaxies: evolution; galaxies: formation; galaxies: star formation; galaxies: stellar content
资金
- NASA [HST-GO-09822]
- Programme national cosmologie et galaxies
- European Research Council
- Royal Society via a Wolfson Research Merit Award
- Lundbeck foundation
- Danish National Research Foundation
- ESO [ID 179.A-2005]
- Science and Technology Facilities Council [ST/J001422/1] Funding Source: researchfish
- Grants-in-Aid for Scientific Research [23244031] Funding Source: KAKEN
- STFC [ST/J001422/1] Funding Source: UKRI
We estimate the galaxy stellar mass function and stellar mass density for star-forming and quiescent galaxies with 0.2 < z < 4. We construct a large, deep (K-s < 24) sample of 220 000 galaxies selected using the new UltraVISTA DR1 data release. Our analysis is based on precise 30-band photometric redshifts. By comparing these photometric redshifts with 10,800 spectroscopic redshifts from the zCOSMOS bright and faint surveys, we find a precision of sigma(Delta z/(1+z)) = 0.008 at i(+) < 22.5 and sigma(Delta z/(1+z)) = 0.03 at 1.5 < z < 4. We derive the stellar mass function and correct for the Eddington bias. We find a mass-dependent evolution of the global and star-forming populations, with the low-mass end of the mass functions evolving more rapidly than the high-mass end. This mass-dependent evolution is a direct consequence of the star formation being quenched in galaxies more massive than M greater than or similar to 10(10.7-10.9) M-circle dot. For the mass function of the quiescent galaxies, we do not find any significant evolution of the high-mass end at z < 1; however we observe a clear flattening of the faint-end slope. From z similar to 3 to z similar to 1, the density of quiescent galaxies increases over the entire mass range. Their comoving stellar mass density increases by 1.6 dex between z similar to 3 and z similar to 1 and by less than 0.2 dex at z < 1. We infer the star formation history from the mass density evolution. This inferred star formation history is in excellent agreement with instantaneous star formation rate measurements at z < 1.5, while we find differences of 0.2 dex at z > 1.5 consistent with the expected uncertainties. We also develop a new method to infer the specific star formation rate from the mass function of star-forming galaxies. We find that the specific star formation rate of 10(10-10.5) M-circle dot galaxies increases continuously in the redshift range 1 < z < 4. Finally, we compare our results with a semi-analytical model and find that these models overestimate the density of low mass quiescent galaxies by an order of magnitude, while the density of low-mass star-forming galaxies is successfully reproduced.
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