SSA 22原星系团中亚毫米星系和莱曼α星系之间的空间相关
Spatial correlation between submillimetre and Lyman-alpha galaxies in the SSA 22 protocluster
摘要：
莱曼α发射体被认为是年轻的低质量星系，年龄约为10^8年。在天空中的一个区域（SSA 22场）中，它们的密度过高，在z = 3.1的红移（相当于宇宙年龄的15%）处描绘出早期宇宙中的一个星系结构，并被认为标志着一个正在形成的原星团。在（亚）毫米波长处明亮的星系正在经历剧烈的恒星形成过程，有证据表明它们优先与高红移射电星系有关，因此自然会产生这样的问题：它们是否也与高红移处最重要的大尺度结构有关（如莱曼α发射体所概述的那样）。在这里，我们报告了在SSA 22区域的1,100微米发射的成像调查。我们发现一个增强的亚毫米星系的核心附近的原星系团，和大规模的亚毫米星系和低质量的莱曼α发射器之间的相关性，这表明同步形成的两个非常不同类型的恒星形成的星系在同一结构中在高红移。这些结果与我们对宇宙结构形成的理解基本一致。
英文摘要：
Lyman-alpha emitters are thought to be young, low-mass galaxies with ages of ~10^8 yr. An overdensity of them in one region of the sky (the SSA 22 field) traces out a filamentary structure in the early Universe at a redshift of z = 3.1 (equivalent to 15 per cent of the age of the Universe) and is believed to mark a forming protocluster. Galaxies that are bright at (sub)millimetre wavelengths are undergoing violent episodes of star formation, and there is evidence that they are preferentially associated with high-redshift radio galaxies, so the question of whether they are also associated with the most significant large-scale structure growing at high redshift (as outlined by Lyman-alpha emitters) naturally arises. Here we report an imaging survey of 1,100-um emission in the SSA 22 region. We find an enhancement of submillimetre galaxies near the core of the protocluster, and a large-scale correlation between the submillimetre galaxies and the low-mass Lyman-alpha emitters, suggesting synchronous formation of the two very different types of star-forming galaxy within the same structure at high redshift. These results are in general agreement with our understanding of the formation of cosmic structure.
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