Lyman alpha团块的加热机制

本课题最重要的科学目标是研究原星系团J2142-4423中Lyman alpha团块的加热机制，并讨论这类天体对宇宙早期星系形成和演化的作用。虽然我们之前的射电连续谱数据给出，其加热机制可能来自星系中恒星形成过程中产生的电离光子，但现有的数据还不能对Lyman alpha 团块的加热机制给出强有力的限制。我们下一步拟开展的研究工作将对Lyman alpha 团块的加热机制做深入的探讨和分析，这是对青年科学基金项目在该科学问题上的深入研究。本项目的主要目标为，通过对原星系团J2142-4423进行高空间分辨率,高灵敏度的分子谱线以及亚毫米波尘埃连续谱的干涉阵观测，确定Lyman alpha团块延展发射的加热机制，并对其存在时标给出估计；另外，利用高分辨观测数据验证Cen Renyue和Zheng Zheng提出的Lyman alpha团块的理论模型，并讨论其对宇宙早期星系形成与演化的作用。

This project is aimed to study the heating mechanism of Lyman alpha blobs in protocluster J2142-4423 and discuss the important role of Lyman alpha blobs on galaxy formation and evolution in the distant Universe. Although our radio continuum data infer that Lyman alpha blobs might be powered by the strong star forming activities from the galaxies, it is difficult to fully constrain the heating mechanism of Lyman alpha blobs. We will further investigate this issue, and it will be a supplement to the previous project. With the unprecedented sensitive molecular line and submillimeter continuum observations at high angular resolution by the ALMA, we are aimed to understand the extended emission, heating mechanism and timescales of Lyman alpha blobs in protocluster J2142-4423. Therefore, we use the ALMA observations to test the theoretical model proposed for Lyman alpha blobs by Cen Renyue and Zheng Zheng, and to discuss the important role of Lyman alpha blobs on galaxy formation and evolution in the distant Universe.