The Far-Infrared Luminosity Function from GOODS-North: Constraining the Evolution of Infrared Galaxies for z ≤ 1
The Far-Infrared Luminosity Function from GOODS-North: Constraining the Evolution of Infrared Galaxies for z ≤ 1
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GOODS-North 的远红外光度函数：限制红外星系的演化（z ≤ 1）
DOI：
10.1086/521981
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
G. Morrison
中科院分区：
文献类型：
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作者：
M. Huynh;D. Frayer;B. Mobasher;M. Dickinson;R. Chary;G. Morrison
本文给出了GOODS-North场超深70 μm成像的红外光度函数。70 μm的观测是PAH和硅酸盐特征的延伸，这些特征使MIR的工作复杂化。计算了143个S_（70）> 2 mJ_y（S/N > 3 σ）源的远红外光度。大多数（81%）的源有光谱红移，其余的则计算光度红移。在四个红移（z ~ 0.28，0.48，0.78，和0.97）的红外光度函数的推导和比较本地的。在光度和密度演化之间存在着相当大的简并性。如果演化的光度函数被描述为ρ（L，z）=（1 + z）qρ（L/（1 + z）p，0），我们发现q = -2.19p +6.09。在纯光度演化的情况下，我们找到了p = 2.78的最佳拟合。这与24 μm和1.4 GHz研究的结果一致。我们的研究结果证实了LIRG和ULIRG在0.4 < z < 1.1时强烈进化的新图像，但我们没有发现z < 0.4时sub-LIRG（L < 1011 L反馈）种群发生显著进化的证据。
We present the IR luminosity function derived from ultradeep 70 μm imaging of the GOODS-North field. The 70 μm observations are longward of the PAH and silicate features which complicate work in the MIR. We derive far-infrared luminosities for the 143 sources with S70 > 2 mJy (S/N > 3 σ). The majority (81%) of the sources have spectroscopic redshifts, and photometric redshifts are calculated for the remainder. The IR luminosity function at four redshifts (z ~ 0.28, 0.48, 0.78, and 0.97) is derived and compared to the local one. There is considerable degeneracy between luminosity and density evolution. If the evolving luminosity function is described as ρ(L, z) = (1 + z)qρ(L/(1 + z)p, 0), we find q = -2.19p + 6.09. In the case of pure luminosity evolution, we find a best fit of p = 2.78. This is consistent with the results from 24 μm and 1.4 GHz studies. Our results confirm the emerging picture of strong evolution in LIRGs and ULIRGs at 0.4 < z < 1.1, but we find no evidence of significant evolution in the sub-LIRG (L < 1011 L☉) population for z < 0.4.