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
Duncan K
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Duncan K

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我们使用CANDELS Goods南场的数据测量了∼4、5、6和7星系样本的星系恒星质量函数和恒星形成率的新估计。深度近红外观测使我们第一次能够直接构造≥6的恒星质量函数。我们通过将观测到的光谱能量分布与包括星云线和连续发射在内的合成恒星群进行拟合来估计样本的恒星质量。观测到的样品的UV光度函数与以前的观测结果是一致的;然而,我们发现观测到的MUV-M*关系有一个较浅的斜率,与恒定的质量光比和随红移演化的归一化更一致。我们的恒星质量函数具有陡峭的低质量斜率(α≈−1.9),比之前在这些红移时观察到的更陡峭,更接近UV光度函数的斜率。积分我们新的质量函数,我们发现观测到的恒星质量密度从∼7演化到7.36±0.06M⊙MPC−3 atz∼4。最后,结合测量的UV连续谱斜率(β)和它们的静止标架UV光度,我们计算了我们样本的尘埃校正恒星形成率。我们发现,固定质量恒星的比SFR随红移而增加,而全球SFR密度在这段时间内迅速下降。我们新的SFR密度估计比以前在这个红移观测到的要高。
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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