论文标题
黑层间介质和黑暗时代和宇宙黎明的光晕中的第一个分子
The first molecules in the intergalactic medium and halos of the Dark Ages and Cosmic Dawn
论文作者
论文摘要
我们研究了黑暗时代和宇宙黎明时代的第一分子的形成和破坏，以评估分子线中原藻集团（Halos）的发光度。使用有效的三级原子的模型来描述宇宙学重组，而使用相关的基本动力学方程检查了分子的化学。然后，我们研究了分子碰撞和辐射激发对温暖和热光晕中分子发射强度的影响。使用有关Z〜6-8时Galactic培养基在Z〜6-8下电离的PLANCK数据，我们评估了从宇宙黎明时期出现的第一个来源的四种热光模型的光能密度的上限。假设在光环中，光能密度本质上可能更高，我们估计了第一源对第一分子形成和破坏的影响。我们表明，分子H2和HD被两种类型的光环和所有模型的所有模型的介质在Halo间培养基中的完整电源之前不久被光解离过程破坏。同时，氦气离子的数量密度heh+基本上对光晕的动力学温度和第一光的模型表现出更为复杂的依赖性。此外，我们估计了与黑暗时代和宇宙黎明时期相对应的红移的H2，HD和HEH+分子旋转线中单个光环的差异亮度温度。它不超过微毛素，但其检测可能是有关在黑暗时代和宇宙黎明时代首批恒星和星系形成时发生的物理过程的重要信息来源。
We study the formation and destruction of the first molecules at the epochs of the Dark Ages and Cosmic Dawn to evaluate the luminosity of the protogalaxy clumps (halos) in the molecular lines. The cosmological recombination is described using the model of an effective three-level atom, while the chemistry of the molecules is examined using the relevant basic kinetic equations. We then studied the effect of collisional and radiative excitation of molecules on the intensity of molecular emission in both warm and hot halos. Using the Planck data on the reionization of the intergalactic medium at z~6-8, we evaluated the upper limits of the light energy density for four models of thermal light from the first sources that appeared in the Cosmic Dawn epoch. Assuming that in the halos, the light energy density may essentially be even higher, we estimated the impact of the light from the first sources on the formation and destruction of the first molecules. We show that the molecules H2 and HD are destroyed by photodissociation processes shortly before the full reionization in the inter-halo medium, in the medium of both types of halos and for all models of the first light. At the same time, the number density of helium hydride ions, HeH+, shows essentially more complicated dependences on the kinetic temperature of halos and the models of the first light. Furthermore, we estimated the differential brightness temperature of the individual halo in the rotational lines of H2, HD and HeH+ molecules at redshifts corresponding to the Dark Ages and Cosmic Dawn epochs. It does not exceed the microkelvin, but its detection may be an important source of information about the physical processes taking place at the beginning of the formation of the first stars and galaxies at the epochs of the Dark Ages and Cosmic Dawn.
