arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1007.3709astro-ph.CO
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红移0.8的氢21厘米强度图

Hydrogen 21-cm Intensity Mapping at redshift 0.8

Tzu-Ching Chang, Ue-Li Pen, Kevin Bandura, Jeffrey B. Peterson

摘要:

在红移z ~ 0.5到~ 2.5的中性氢21厘米射电辐射的观测有望提供宇宙暗能量的灵敏探测。这在z ~ 1处的加速开始时尤其如此,因为大气的红外不透明性,传统的光学宇宙学变得非常困难。然而,仅在z=0.24时检测到21-cm发射。更遥远的星系通常太微弱,无法单独探测,但有可能测量“宇宙网”中许多未解决的星系的总发射。在这里,我们报告一个三维21厘米的强度场在z=0.53至1.12。然后,我们共同添加HI发射周围约一万个星系的体积(从深度2光学星系红移调查。我们检测到的聚合21厘米辉光在~ 4西格玛的意义。

英文摘要:

Observations of 21-cm radio emission by neutral hydrogen at redshifts z ~ 0.5 to ~ 2.5 are expected to provide a sensitive probe of cosmic dark energy. This is particularly true around the onset of acceleration at z ~ 1, where traditional optical cosmology becomes very difficult because of the infrared opacity of the atmosphere. Hitherto, 21-cm emission has been detected only to z=0.24. More distant galaxies generally are too faint for individual detections but it is possible to measure the aggregate emission from many unresolved galaxies in the 'cosmic web'. Here we report a three dimensional 21-cm intensity field at z=0.53 to 1.12. We then co-add HI emission from the volumes surrounding about ten thousand galaxies (from the DEEP2 optical galaxy redshift survey. We detect the aggregate 21-cm glow at a significance of ~ 4 sigma.

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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