论文标题
Lyman-$α$排放线加热和冷却对宇宙黎明21厘米信号的影响
The impact of Lyman-$α$ emission line heating and cooling on the cosmic dawn 21-cm signal
论文作者
论文摘要
在第一个形成星系中，允许从人口III主导的恒星系统中增强LY $α$光子线线排放，我们显示21厘米宇宙黎明信号（$ 10 <z <30 $）可能与标准方案有很大不同。如果星系中的HII区域是重组结合的，则从星系中出现的$α$光子通过$α$光子转移可能会加热与绝热膨胀相比，如果被光环内部的风变红，则气体更快。在某些情况下，差异21厘米的天线温度接近$ -500 $ MK的价格为$ 15 <z <25 $，类似于边缘21厘米宇宙黎明实验的签名。
Allowing for enhanced Ly$α$ photon line emission from Population III dominated stellar systems in the first forming galaxies, we show the 21-cm cosmic dawn signal at $10<z<30$ may substantially differ from standard scenarios. Energy transfer by Ly$α$ photons emerging from galaxies may heat intergalactic gas if HII regions within galaxies are recombination bound, or cool the gas faster than by adiabatic expansion if reddened by winds internal to the haloes. In some cases, differential 21-cm antenna temperatures near $-500$ mK may be achieved at $15<z<25$, similar to the signature detected by the EDGES 21-cm cosmic dawn experiment.
