The Rest-Frame Optical Luminosity Density, Color, and Stellar Mass Density of the Universe from z = 0 to z = 3
The Rest-Frame Optical Luminosity Density, Color, and Stellar Mass Density of the Universe from z = 0 to z = 3
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DOI：
10.1086/379628
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发表时间：
2003-07
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通讯作者：
G. Rudnick;H. Rix;M. Franx;I. Labbé;M. Blanton;E. Daddi;N. F. Förster Schreiber;A. Moorwood;H. Röttgering;I. Trujillo;Arjen van de Wel;P. P. van der Werf-P.;P. V. van Dokkum;L. van Starkenburg
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作者：
G. Rudnick;H. Rix;M. Franx;I. Labbé;M. Blanton;E. Daddi;N. F. Förster Schreiber;A. Moorwood;H. Röttgering;I. Trujillo;Arjen van de Wel;P. P. van der Werf-P.;P. V. van Dokkum;L. van Starkenburg
本文给出了哈勃深场南（HDF-S）中Ks波段选择星系的静止坐标系光学光度密度j、积分静止坐标系光学色和恒星质量密度ρ* 的演化。我们导出了静止坐标系U、B和V带中的j，发现在红移0.1和3.2之间，j在V、B和U静止坐标系带中分别增加了1.9 ± 0.4、2.9 ± 0.6和4.9 ± 1.0倍。我们导出了亮度加权平均宇宙（U-B）静止色和（B-V）静止色作为红移的函数。随着红移的增加，颜色几乎单调地变蓝;在z = 0.1时，（U-B）静止色和（B-V）静止色分别为0.16和0.75，而在z = 2.8时，它们分别为-0.39和0.29。我们推导出亮度加权平均M/L，使用（U-V）的休息和日志M/L之间的相关性，存在于一个范围内的平滑星星形成历史（SFHS）和中等的反射。我们已经证明，单个M/L估计的平均值可以高估真实值约70%，而我们的方法仅高估真实值约35%。我们发现，在L > 1.4 × 1010 h L的星系中，z ~ 3处的宇宙的恒星质量密度比现在低10倍。宇宙中一半的恒星质量是由z ~ 1-1.5形成的。ρ* 随红移减小而增加的速率与HDF-N的独立估计相似，但高于HDF-N的独立估计，但略低于SFR（z）曲线积分预测的速率。
We present the evolution of the rest-frame optical luminosity density j, the integrated rest-frame optical color, and the stellar mass density, ρ*, for a sample of Ks band-selected galaxies in the Hubble Deep Field-South (HDF-S). We derived j in the rest-frame U, B, and V bands and found that j increases by a factor of 1.9 ± 0.4, 2.9 ± 0.6, and 4.9 ± 1.0 in the V, B, and U rest-frame bands, respectively, between redshifts of 0.1 and 3.2. We derived the luminosity-weighted mean cosmic (U-B)rest and (B-V)rest colors as a function of redshift. The colors bluen almost monotonically with increasing redshift; at z = 0.1, the (U-B)rest and (B-V)rest colors are 0.16 and 0.75, respectively, while at z = 2.8 they are -0.39 and 0.29, respectively. We derived the luminosity-weighted mean M/L, using the correlation between (U-V)rest and log M/L that exists for a range in smooth star formation histories (SFHs) and moderate extinctions. We have shown that the mean of individual M/L estimates can overpredict the true value by ~70%, while our method overpredicts the true value by only ~35%. We find that the universe at z ~ 3 had ~10 times lower stellar mass density than it does today in galaxies with L > 1.4 × 1010 h L☉. Half of the stellar mass of the universe was formed by z ~ 1-1.5. The rate of increase in ρ* with decreasing redshift is similar to but above that for independent estimates from the HDF-N, but it is slightly less than that predicted by the integral of the SFR(z) curve.