New Population Synthesis Models of the Cosmic UV Background
New Population Synthesis Models of the Cosmic UV Background
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宇宙紫外背景的新总体合成模型
DOI：
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发表时间：
2011
期刊：
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通讯作者：
P. Madau
中科院分区：
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作者：
F. Haardt;P. Madau
我们提出了 UV/X 射线漫射背景演变光谱的改进合成模型，更新和扩展了我们之前的结果。提出了一个“最小宇宙再电离模型”，其中星系紫外线发射率追踪了恒星形成的宇宙历史的最新确定，氢电离辐射的光度加权逃逸分数随着红移迅速增加，从z=3时的1%到z=8.5时的50%，星系间介质的聚集因子为C=3，并且星族III恒星对超星系通量的贡献可以忽略不计。该模型很好地拟合了从通量衰减测量中推断出的氢电离率，并产生了汤姆逊散射的光学深度，tau_e=0.085，这与 WMAP 结果一致。
We present improved synthesis models of the evolving spectrum of the UV/X-ray diffuse background, updating and extending our previous results. A "minimal cosmic reionization model" is presented in which the galaxy UV emissivity traces recent determinations of the cosmic history of star formation, the luminosity-weighted escape fraction of hydrogen-ionizing radiation increases rapidly with redshift, from 1% at z=3 to 50% at z=8.5, the clumping factor of the intergalactic medium is C=3, and Population III stars make a negligible contribution to the metagalactic flux. The model provides a good fit to the hydrogen-ionization rates inferred from flux decrement measurements, and yields an optical depth to Thomson scattering, tau_e=0.085, that is in agreement with WMAP results.