The Rest-frame Optical (900 nm) Galaxy Luminosity Function at z ∼ 4–7: Abundance Matching Points to Limited Evolution in the MSTAR/MHALO Ratio at z ≥ 4

The Rest-frame Optical (900 nm) Galaxy Luminosity Function at z ∼ 4–7: Abundance Matching Points to Limited Evolution in the MSTAR/MHALO Ratio at z ≥ 4
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z ∼ 4–7 处的静止框架光学 (900 nm) 星系光度函数:z ≥ 4 处 MSTAR/MHALO 比率中有限演化的丰度匹配点

DOI:
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发表时间:
2016
期刊:
影响因子:
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通讯作者:
V. González
V. González
中科院分区:
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文献类型:
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作者:
M. Stefanon;R. Bouwens;I. Labb'e;A. Muzzin;D. Marchesini;P. Oesch;V. González

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在静止系光学z′波段,首次测定了z = 4,5,6和7的星系光度函数(LF).静止坐标系的光学光线追踪低质量演化恒星(恒星质量-M *)中的含量,最大限度地减少M* 的潜在测量偏差。此外,它受星云谱线污染和尘埃衰减的影响较小,不依赖于恒星布居模型,并且可以通过斯皮策/IRAC探测到z = 8。我们的分析利用了CANDELS/GOODS-N、CANDELS/GOODS-S和COSMOS/UltraVISTA字段上独特的全深度Spitzer/IRAC 3.6-8.0 μm数据。我们发现,在绝对星等比等暗的地方,与。在明亮的,提出了一个营业额,这表明恒星的质量与光的比例可以通过一个非常广泛的范围内的值在高恒星质量的特点。中值叠加分析恢复了一个大致独立的等,但在更明亮的幅度呈指数增加。我们发现,LF的演化略微倾向于纯光度演化而不是纯密度演化,其特征光度降低了z = 4和z = 7之间的因子。直接应用恢复产生的恒星质量函数与文献中的平均测量值一致。在固定的累积数密度下,恒星与晕的质量比的测量表明,它随着红移的增加而大致保持不变。这也是支持的事实,即LF的演变,可以解释为一个刚性位移的光度,对应于从丰度匹配的晕质量的演变。
We present the first determination of the galaxy luminosity function (LF) at z ∼ 4, 5, 6, and 7, in the rest-frame optical at (z′ band). The rest-frame optical light traces the content in low-mass evolved stars (∼stellar mass—M*), minimizing potential measurement biases for M*. Moreover, it is less affected by nebular line emission contamination and dust attenuation, is independent of stellar population models, and can be probed up to z ∼ 8 through Spitzer/IRAC. Our analysis leverages the unique full-depth Spitzer/IRAC 3.6–8.0 μm data over the CANDELS/GOODS-N, CANDELS/GOODS-S, and COSMOS/UltraVISTA fields. We find that, at absolute magnitudes where is fainter than mag, linearly correlates with . At brighter , presents a turnover, suggesting that the stellar mass-to-light ratio could be characterized by a very broad range of values at high stellar masses. Median-stacking analyses recover an roughly independent on for mag, but exponentially increasing at brighter magnitudes. We find that the evolution of the LF marginally prefers a pure luminosity evolution over a pure density evolution, with the characteristic luminosity decreasing by a factor of between z ∼ 4 and z ∼ 7. Direct application of the recovered generates stellar mass functions consistent with average measurements from the literature. Measurements of the stellar-to-halo mass ratio at fixed cumulative number density show that it is roughly constant with redshift for . This is also supported by the fact that the evolution of the LF at can be accounted for by a rigid displacement in luminosity, corresponding to the evolution of the halo mass from abundance matching.
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