First Infrared-Based Implications for the Dust Attenuation and Star Formation of Typical Lyα Emitters
First Infrared-Based Implications for the Dust Attenuation and Star Formation of Typical Lyα Emitters
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第一个基于红外的对典型 Lyα 发射体的尘埃衰减和恒星形成的影响
DOI：
10.1088/2041-8205/800/2/l29
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
H. et al.
中科院分区：
文献类型：
--
作者：
Kusakabe;H. et al.
通过对南方货物区213LyEmitters(LAE)的Spitzer/MIPS 24m和Herschel/PACS图像进行叠加，得到了典型LAE红外光度的一个强上限，并首次讨论了它们的衰减曲线。根据提供最低限值的MIPS数据确定的上限给出。在这里，我们假设8M发射与尘埃SED形状和金属丰度之间的局域定标适用于高红移，而我们的LAE具有先前研究所表明的低金属丰度。推算出的Ly逃逸分数为-37%，UV连续谱为44%，均高于同一时期的宇宙平均值。SMC衰减曲线与层叠LAE的IRX和UV斜率一致，而Meurer关系(Calzetti曲线)预测IRX高3.8倍；我们还讨论了基于PACS的允许Meurer关系的有效性。使用Calzetti曲线进行SED拟合也可以得到比AND曲线更高的SFR。因此，我们的LAE建立在恒星形成主序列的低质量外推上，这表明大多数LAE是温和的恒星形成，具有相对较老的Myr年龄。LAES对ALMA计算的弱(Jy)亚毫米数贡献很小。
By stacking publicly available deep Spitzer/MIPS 24m and Herschel/PACS images for 213LyEmitters (LAEs) in GOODS-South, we obtain a strong upper limit to the IR luminosity of typical LAEs and discuss their attenuation curve for the first time. Theupper limit, determined from the MIPS data providing the lowest limit, gives. Here we assume that the local calibration between the 8m emission and the dust SED shape and metallicity applies at high redshifts and that our LAEs have low metallicities as suggested by previous studies. The inferred escape fractions of Ly,--$37%$, and UV continuum, $\ge 44%$, are higher than the cosmic averages at the same epoch. The SMC attenuation curve is consistent with the IRX and the UV slopeof our stacked LAE, while the Meurer's relation (Calzetti curve) predicts a 3.8 times higher IRX; we also discuss the validity of PACS-basedallowing the Meurer's relation. SED fitting using the Calzetti curve also gives atimes higher SFR than from theand. With, our LAEs lie on a lower-mass extrapolation of the star formation main sequence at, suggesting that the majority ofLAEs are mildly star forming with relatively old ages ofMyr. The faintimplies that LAEs contribute little to the faint (Jy) submm number counts by ALMA.