论文标题
人口III星形成的临界暗物质光环质量：依赖Lyman-Werner辐射，Baryon-Dark物质流速度和红移
The critical dark matter halo mass for Population III star formation: dependence on Lyman-Werner radiation, baryon-dark matter streaming velocity, and redshift
论文作者
论文摘要
人口III（POP III）恒星的关键暗物质光环质量（$ M _ {\ rm Crit} $）可以定义为构成第一颗恒星所需的足够冷致密气体的典型最小光晕质量。 Lyman-Werner（UV）辐射的存在，可以解散分子氢，而Baryon-Dark物质流速度都通过增加$ M _ {\ rm Crit} $来延迟流行III星的形成。在这项工作中，我们限制了$ m _ {\ rm Crit} $作为Lyman-Werner Flux（包括自屏蔽），Baryon-Dark Matter流的函数，以及使用宇宙学模拟的RedShift，并使用了大量的HAROS使用适应性网状（AMR）代码ENZO。我们为$ M _ {\ rm Crit} $提供了适合这些数量的函数，我们希望这对于早期星系形成的半分析模型特别有用。此外，我们发现：（i）在没有辐射或流的情况下，$ m _ {\ rm crit} $的红移依赖性为$（1+z）^{ - 1.58} $，与恒定的病毒温度一致； （ii）增加紫外线背景会增加$ m _ {\ rm crit} $，同时浸入红移依赖性，最高$（1+z）^{ - 5.7} $; （iii）Baryon-Dark Matter流媒体提升$ M _ {\ rm Crit} $，但会使对Redshift的依赖性变平； （iv）两种效应的组合不仅是乘法。
A critical dark matter halo mass ($M_{\rm crit}$) for Population III (Pop III) stars can be defined as the typical minimum halo mass that hosts sufficient cold dense gas required for the formation of the first stars. The presence of Lyman-Werner (UV) radiation, which can dissociate molecular hydrogen, and the baryon-dark matter streaming velocity both delay the formation of Pop III stars by increasing $M_{\rm crit}$. In this work, we constrain $M_{\rm crit}$ as a function of Lyman-Werner flux (including self-shielding), baryon-dark matter streaming, and redshift using cosmological simulations with a large sample of halos utilizing the adaptive mesh refinement (AMR) code ENZO. We provide a fit for $M_{\rm crit}$ as a function of these quantities which we expect to be particularly useful for semi-analytical models of early galaxy formation. In addition, we find: (i) the measured redshift dependence of $M_{\rm crit}$ in the absence of radiation or streaming is $(1+z)^{-1.58}$, consistent with a constant virial temperature; (ii) increasing the UV background increases $M_{\rm crit}$ while steepening the redshift dependence, up to $(1+z)^{-5.7}$; (iii) baryon-dark matter streaming boosts $M_{\rm crit}$ but flattens the dependence on redshift; (iv) the combination of the two effects is not simply multiplicative.
