论文标题
检测21厘米强度图中的相对论双光谱
Detecting the relativistic bispectrum in 21cm intensity maps
论文作者
论文摘要
我们研究了未来21cm强度映射调查的双光谱中领先相对论效应的可检测性。相对论信号来自红移空间中的多普勒和其他视线效应。在单个示踪剂的功率谱中，这些效果被因子$ \ ch^2/k^2 $抑制。相比之下，在双光谱中，相对论信号夫妇伴侣与短尺度模式，导致假想的贡献缩放为$ \ ch/k $，从而增加了检测的可能性。先前的工作表明，在IV级H $α$ Galaxy调查中可以检测到这种相对论信号。 {我们表明，下一代21cm强度图也可以检测到信号，但由于前景和望远镜梁的效应，通常具有较低的信号到噪声。
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.
