arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.01563astro-ph.GAastro-ph.CO
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通过全天空亚毫米光谱巡天了解星系形成和演化

Understanding galaxy formation and evolution through an all-sky submillimetre spectroscopic survey

Mattia Negrello, Matteo Bonato, Zhen-Yi Cai, Helmut Dannerbauer, Gianfranco De Zotti, Jacques Delabrouille, Douglas Scott

摘要:

我们说明了非凡的发现河外天体物理学的远红外/亚毫米全天空光谱调查与3米级空间望远镜的潜力。光谱学提供了宇宙的3D视图,并使我们能够充分利用当今仪器的灵敏度,克服影响宽带远红外/亚毫米测量的空间混乱。由恒星形成提供动力的发射线将在$z \simeq 8$以外的星系中被探测到。它将在宇宙恒星形成的高峰时期为数百万个星系提供光谱红移,SFR,尘埃质量和金属含量的测量,并在再电离时期为数百个星系提供测量。这些星系中有许多将被强烈透镜化;亮度放大和尺寸的拉伸将使人们有可能在巨大分子云的尺度上研究(通过高分辨率仪器的后续行动)它们的内部结构和动力学。这将提供有关推动进化的物理学的直接信息。此外,望远镜在亚毫米波长的角分分辨率是探测星系原星团核心的理想选择,直到再电离的时代。在$z \simeq 2$-3处将检测到数千万个这样的星系团,尾部延伸到$z \simeq 7$,在6 < z < 7处将检测到数千个。他们的研究将使我们能够跟踪最大质量晕的增长,远远超过经典的星团巡天(主要限于$z < 1.5$ -2),追踪致密环境中恒星形成的历史,并告诉我们恒星形成和星系团形成如何在所有时代之间相互关联。这样的调查将克服目前缺乏光谱红移的尘埃恒星形成星系和星系原星团,代表了量子飞跃远红外/亚毫米河外天体物理学。

英文摘要:

We illustrate the extraordinary discovery potential for extragalactic astrophysics of a far-IR/submm all-sky spectroscopic survey with a 3m-class space telescope. Spectroscopy provides both a 3D view of the Universe and allows us to take full advantage of the sensitivity of present-day instrumentation, overcoming the spatial confusion that affects broadband far-IR/submm surveys. Emission lines powered by star formation will be detected in galaxies out to $z \simeq 8$. It will provide measurements of spectroscopic redshifts, SFRs, dust masses, and metal content for millions of galaxies at the peak epoch of cosmic star formation and of hundreds of them at the epoch of reionization. Many of these galaxies will be strongly lensed; the brightness amplification and stretching of their sizes will make it possible to investigate (by means of follow-up with high-resolution instruments) their internal structure and dynamics on the scales of giant molecular clouds. This will provide direct information on the physics driving the evolution. Furthermore, the arc-min resolution of the telescope at submm wavelengths is ideal for detecting the cores of galaxy proto-clusters, out to the epoch of reionization. Tens of millions of these galaxy-clusters-in-formation will be detected at $z \simeq 2$-3, with a tail out to $z \simeq 7$, and thousands of detections at 6 < z < 7. Their study will allow us to track the growth of the most massive halos well beyond what is possible with classical cluster surveys (mostly limited to $z < 1.5$-2), tracing the history of star formation in dense environments and teaching us how star formation and galaxy-cluster formation are related across all epochs. Such a survey will overcome the current lack of spectroscopic redshifts of dusty star-forming galaxies and galaxy proto-clusters, representing a quantum leap in far-IR/submm extragalactic astrophysics.

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