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arXiv 1004.4364astro-ph.CO
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ALMA和第一个伽利略

ALMA and the First Galaxies

F. Combes

摘要:

ALMA将在几年内全面运作,并为原始星系打开一扇新的窗口。毫米和亚毫米域是特权,因为60和100微米之间的尘埃发射的峰值在z= 5-10时红移,并且连续谱受益于负K校正。至少可以发现比现有仪器多100倍的源,因此可以调查更多的正常星系,其光度低于巨大的恒星爆发和类星体。高空间分辨率将抑制困扰今天单碟测辐射热计调查的混乱。宽带接收器中检测到的几条CO谱线将确定光学上无法看到的太模糊的物体的红移。与目前的仪器,只有最大的质量和气体丰富的对象已被检测到在CO在高Z,其中大多数是超明亮的恒星爆发具有极高的恒星形成效率。然而,在这个领域,选择偏差是无所不在的,ALMA将从统计上澄清恒星形成效率的演变,与JWST和ELT完全互补。

英文摘要:

ALMA will become fully operational in a few years and open a new window on primordial galaxies. The mm and submm domain is privileged, since the peak of dust emission between 60 and 100 microns is redshifted there for z= 5-10, and the continuum benefits from a negative K-correction. At least 100 times more sources than with present instruments could be discovered, so that more normal galaxies, with lower luminosities than huge starbursts and quasars will be surveyed. The high spatial resolution will suppress the confusion, which plagues today single dish bolometer surveys. Several CO lines detected in broad-band receivers will determine the redshift of objects too obscured to be seen in the optical. With the present instrumentation, only the most massive and gas rich objects have been detected in CO at high z, most of them being ultra-luminous starbursts with an extremely high star formation efficiency. However, selection biases are omni-present in this domain, and ALMA will statistically clarify the evolution of star formation efficiency, being fully complementary to JWST and ELTs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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