arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.06197astro-ph.CO
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21cm强度图中相对论性双谱的探测

Detecting the relativistic bispectrum in 21cm intensity maps

Sheean Jolicoeur, Roy Maartens, Eline M. De Weerd, Obinna Umeh, Chris Clarkson, Stefano Camera

摘要:

我们研究了未来21厘米强度测绘调查的双谱中领先阶相对论效应的可探测性。相对论信号来自红移空间中的多普勒效应和其他视线效应。在单个示踪剂的功率谱中,这些效应被因子$\cH^2/k^2$抑制。相比之下,在双谱中,相对论信号耦合到短尺度模式,导致作为$\cH/k$缩放的虚贡献,从而增加检测的可能性。先前的工作已经表明,这种相对论性信号在第四阶段的H $α$星系巡天中是可以探测到的。{We显示该信号也可以通过下一代21厘米强度图检测到,但由于前景和望远镜光束效应,通常具有较低的信噪比。

英文摘要:

We investigate the detectability of leading-order relativistic effects in the bispectrum of future 21cm intensity mapping surveys. The relativistic signal arises from Doppler and other line-of-sight effects in redshift space. In the power spectrum of a single tracer, these effects are suppressed by a factor $\cH^2/k^2$. By contrast, in the bispectrum the relativistic signal couples to short-scale modes, leading to an imaginary contribution that scales as $\cH/k$, thus increasing the possibility of detection. Previous work has shown that this relativistic signal is detectable in a Stage IV H$α$ galaxy survey. {We show that the signal is also detectable by next-generation 21cm intensity maps, but typically with a lower signal-to-noise, due to foreground and telescope beam effects.

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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