论文标题
z〜3.3处的ly-alpha星云
A Ly-alpha nebula at z~3.3
论文作者
论文摘要
语境。寻找高红移星系是现代观察宇宙学的激烈活动领域，它将随着未来的地面和天空观测的发展而继续增长。在过去的几年中，有关High-Z宇宙的了解了很多。目标。尽管从低红移到高红移，但大量的Ly-Alpha Blob（实验室）调查大多数在Z〜2-4处发现了超过100 kpc的巨型实验室。这种红移范围与银河气体循环过程的过渡时期从流入到Z〜2.5-3时流出。这表明巨型实验室的形成可能与气体流入和流出的结合有关。他们的极端年轻人使它们在研究星系形成的研究中使它们成为有趣的物体，因为它们可以洞悉一些最年轻的高度恒星形成星系，只使用基于地面的望远镜进行时间投资。方法。系统的窄带Ly-Alpha星云调查正在进行中，但它们在覆盖的红移范围内受到限制，并且量很大。在搜索这种罕见来源时，这构成了一个重要的问题。为了解决这个问题，我们开发了一种系统的搜索工具Atacama（一种用于搜索大型Lyman Alpha Nebulae的工具），旨在在深层多波长宽带成像中的任何红移。结果。我们在ZPHOT 〜3.3上鉴定了一个覆盖29.4平方米Arcsec的同流面积的Ly-Alpha星云候选者。它的形态显示出明亮的核心和微弱的核心，它与以前已知的ly-alpha斑点的形态相吻合。对Ly-Alpha等效宽度和线通量的首次估计与几个组领导的研究值一致。
Context. Searching for high-redshift galaxies is a field of intense activity in modern observational cosmology that will continue to grow with future ground-based and sky observatories. Over the last few years, a lot has been learned about the high-z Universe. Aims. Despite extensive Ly-alpha Blobs (LAB) surveys from low to high redshifts, giant LABs over 100 kpc have been found mostly at z~2-4. This redshift range is coincident with the transition epoch of galactic gas-circulation processes from inflows to outflows at z~2.5-3. This suggests that the formation of giant LABs may be related to a combination of gas inflows and outflows. Their extreme youth makes them interesting objects in the study of galaxy formation as they provide insight into some of the youngest known highly star forming galaxies, with only modest time investments using ground-based telescopes. Methods. Systematic narrow-band Ly-alpha nebula surveys are ongoing, but they are limited in their covered redshift range and their comoving volume. This poses a significant problem when searching for such rare sources. To address this problem, we developed a systematic searching tool, ATACAMA (A Tool for seArChing for lArge LyMan Alpha nebulae) designed to find large Ly-alpha nebulae at any redshift within deep multi-wavelength broad-band imaging. Results. We identified a Ly-alpha nebula candidate at zphot~3.3 covering an isophotal area of 29.4sq.arcsec. Its morphology shows a bright core and a faint core which coincides with the morphology of previously known Ly-alpha blobs. A first estimation of the Ly-alpha equivalent width and line flux agree with the values from the study led by several groups.
