Theoretical study for the fundamental physical processes of the star formation in proto-galactic clouds and the formation of cosmological first luminous objects.

我们研究了早期宇宙发光体的形成过程，并对它们进行了讨论，为观测到的物理场景提供了佐证。首先，我们研究了原始气体中的恒星形成过程，并估算了H_2和HD分子的发射线亮度，这是因为它们有望表征原始恒星的形成过程。对于第一代恒星的形成过程来说，HD并不重要。但对于大质量原星系云中恒星的形成，HD扮演着重要的冷却剂角色。LiH分子从未发挥过重要作用。其次，我们研究了丝状云的演化，它是通过原星系云的碎裂过程而形成的，对恒星形成核的形成具有重要意义。在坍缩和碎裂过程中，暗物质分量的比例非常大。考虑到在引力势能井中形成的细丝，在碎裂之前不可能足够坍塌。因此，高效的恒星形成预计是不可能的。我们还估算了恒星形成核心的母体--无暗物质的灯丝的H_2和HD分子的发射线亮度。最后，估算了原星系云中的原始恒星形成率，讨论了早期宇宙发光体形成过程的观测可能性。由于红移效应的存在，观测中红外辐射具有重要意义。因此，SPICA(宇宙学和天体物理学空间红外望远镜)最有可能在下一代设施中进行观测证实。如果原始气体中的恒星形成率与通常的恒星爆发星系的恒星形成率一样大，Spica就可以观测到早期宇宙发光物体第一次形成过程中的原始分子谱线。

We investigated on the formation process of early cosmological luminous objects and discussed them for the observational corroboration of physical scenarios. Firstly, we studied the star formation process in the primordial gas, and estimate the emission line luminosities of H_2 and HD molecules, which are important because they are expected to characterize the primordial star formation process. For the formation process of the first generation stars, HD is not important. But for the star formation in the massive proto-galactic clouds, HD plays important roles as coolant. LiH molecule never plays important role. Secondly, we studied the evolution of the filamentary clouds, which is formed via the fragmentation process of the proto-galactic clouds and important for the formation of the star forming core. In the collapse and the fragmentation processes, the fraction of the dark matter component is very significant. Considering the filaments formed in the gravitational potential well, it is impossible to collapse enough before fragmentation. Thus, efficient star formation is expected to be impossible. We also estimated the emission line luminosities of H_2 and HD molecules for the filaments without dark matter, which are the mother objects of the star formation cores. Finally, estimating the primordial star formation rate in the proto-galactic clouds, we discuss the observational possibility of the formation process of early cosmological luminous objects. Because of the redshift effects, it is important to observe mid-infrared radiation. Thus, SPICA (Space Infrared Telescope for Cosmology and Astrophysics) has the best chance for the observational corroboration in the next generation facilities. If the star formation rate in the primordial gas is as large as the star forming rate of the usual star burst galaxies, SPICA can observe the primordial molecular lines from the first forming process of early cosmological luminous objects.