The mass evolution of the first galaxies: stellar mass functions and star formation rates at 4 < z < 7 in the CANDELS GOODS-South field
The mass evolution of the first galaxies: stellar mass functions and star formation rates at 4 < z < 7 in the CANDELS GOODS-South field
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第一个星系的质量演化:CANDELS GOODS-South 场中 4 < z < 7 处的恒星质量函数和恒星形成率
DOI:
10.1093/mnras/stu1622
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发表时间:
2014
影响因子:
4.8
通讯作者:
Duncan K
中科院分区:
文献类型:
--
作者:
Duncan K
We measure new estimates for the galaxy stellar mass function and star formation rates for samples of galaxies atz∼ 4, 5, 6 and 7 using data in the CANDELS GOODS South field. The deep near-infrared observations allow us to construct the stellar mass function atz≥ 6 directly for the first time. We estimate stellar masses for our sample by fitting the observed spectral energy distributions with synthetic stellar populations, including nebular line and continuum emission. The observed UV luminosity functions for the samples are consistent with previous observations; however, we find that the observedMUV-M*relation has a shallow slope more consistent with a constant mass-to-light ratio and a normalization which evolves with redshift. Our stellar mass functions have steep low-mass slopes (α ≈ −1.9), steeper than previously observed at these redshifts and closer to that of the UV luminosity function. Integrating our new mass functions, we find the observed stellar mass density evolves fromatz∼ 7 to 7.36 ± 0.06 M⊙Mpc− 3atz∼ 4. Finally, combining the measured UV continuum slopes (β) with their rest-frame UV luminosities, we calculate dust-corrected star formation rates (SFR) for our sample. We find the specific SFR for a fixed stellar mass increases with redshift whilst the global SFR density falls rapidly over this period. Our new SFR density estimates are higher than previously observed at this redshift.
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DOI:
10.1111/j.1365-2966.2010.17554.x
发表时间:
2010-05
影响因子:
4.8
作者:
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影响因子:
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2004-07
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--
影响因子:
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DOI:
10.1088/0004-637x/781/1/34
发表时间:
2012-08
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The Astrophysical Journal
影响因子:
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10.1088/0004-637x/697/1/942
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2008
期刊:
The Astrophysical Journal
影响因子:
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