The photometric properties of galaxies in the early Universe
The photometric properties of galaxies in the early Universe
复制标题
早期宇宙星系的光度特性
DOI：
10.1093/mnras/stw1154
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发表时间：
2016
影响因子：
4.8
通讯作者：
Wilkins S
中科院分区：
文献类型：
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作者：
Wilkins S
我们利用大宇宙流体动力学模拟BlueTide来预测星系在再电离时期（z= 8-15）的光度特性。这些性质包括静止坐标系紫外到近红外的宽带光谱能量分布、莱曼连续谱（LyC）光子产生、紫外星星形成率定标和内禀紫外连续谱斜率。特别是，我们专注于探索各种建模假设的效果，包括假设选择的恒星人口合成（SPS）模型，初始质量函数，和逃逸分数的LyC光子，对这些数量。我们发现，这些建模的假设可以有一个戏剧性的影响，导致后果的准确测定的物理性质的观测光度特性。例如，atz= 8时，我们预测星云发射可以占静止帧R带光度的50%，而SPS模型的选择可以改变LyC的产生率高达2倍。
We use the large cosmological hydro-dynamic simulation BlueTidesto predict the photometric properties of galaxies during the epoch of reionization (z= 8–15). These properties include the rest-frame UV to near-IR broad-band spectral energy distributions, the Lyman continuum (LyC) photon production, the UV star formation rate calibration, and intrinsic UV continuum slope. In particular we focus on exploring the effect of various modelling assumptions, including the assumed choice of stellar population synthesis (SPS) model, initial mass function, and the escape fraction of LyC photons, upon these quantities. We find that these modelling assumptions can have a dramatic effect on photometric properties leading to consequences for the accurate determination of physical properties from observations. For example, atz= 8 we predict that nebular emission can account for up to 50 per cent of the rest-frameR-band luminosity, while the choice of SPS model can change the LyC production rate up to a factor of ×2.