论文标题
第一颗恒星的摇篮：自挡，光环质量和多重性
Cradles of the first stars: self-shielding, halo masses, and multiplicity
论文作者
论文摘要
人口III（POP III）恒星的形成是早期宇宙发展的关键步骤。要了解这些恒星如何影响其富含金属的后代，需要确定如何，原因和何处进行流行III形成的细节。假定极大地影响流行III星形成的过程之一是存在Lyman-Werner（LW）辐射背景，它破坏了H $ _2 $，这是Pop III星的创建中必不可少的冷却剂。自我屏蔽可以减轻LW背景对Haloes内H $ _2 $的影响。在这项工作中，我们使用自适应网格改进代码enzo进行宇宙学模拟，以研究流行III星的出生地。我们研究了宿主光环质量的分布及其与LW背景强度的关系。与以前的工作相比，由于包括h $ _2 $自屏蔽，Haloes在低得多的质量中形成了流行III星，最高少数几个。我们看到LW强度与宿主光晕质量之间没有关系。在流行III组的情况下，大多数光环构成多个流行III星，中位数为四个，最多可达16个。我们的结果表明，POP III星形形成可能比以前认为的LW辐射反馈的影响较小，并且POP III多个系统很常见。
The formation of Population III (Pop III) stars is a critical step in the evolution of the early universe. To understand how these stars affected their metal-enriched descendants, the details of how, why and where Pop III formation takes place needs to be determined. One of the processes that is assumed to greatly affect the formation of Pop III stars is the presence of a Lyman-Werner (LW) radiation background, that destroys H$_2$, a necessary coolant in the creation of Pop III stars. Self-shielding can alleviate the effect the LW background has on the H$_2$ within haloes. In this work, we perform a cosmological simulation to study the birthplaces of Pop III stars, using the adaptive mesh refinement code Enzo. We investigate the distribution of host halo masses and its relationship to the LW background intensity. Compared to previous work, haloes form Pop III stars at much lower masses, up to a factor of a few, due to the inclusion of H$_2$ self-shielding. We see no relationship between the LW intensity and host halo mass. Most haloes form multiple Pop III stars, with a median number of four, up to a maximum of 16, at the instance of Pop III formation. Our results suggest that Pop III star formation may be less affected by LW radiation feedback than previously thought and that Pop III multiple systems are common.
