Speaker
Description
One of the important cosmological studies is verifying the accuracy of the standard model, and investigations of small-scale structure formation are needed. However, observations so far for scales smaller than around 100 kpc have not been conducted adequately yet. For these scales, the structures at the epoch of pre-reionization called minihalos are good targets to investigate, and it is estimated to be detected through 21 cm absorption lines. On the other hand, the relationships among the mass of minihalos, the physical process such as radiation, and the 21 cm optical depth are still uncertain. In our study, we investigate the impact of the radiation background on the 21 cm optical depth when minihalos form and estimate the absorption line abundance, etc. We study by combining data from the simulation reflecting the halo’s feature on a large scale with data from the simulation for the physical process on a small scale.
