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arXiv 2205.09770astro-ph.CO
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利用HERA和罗马高纬度巡天对21厘米星系交叉相关的展望

Prospects for 21cm-Galaxy Cross-Correlations with HERA and the Roman High-Latitude Survey

Paul La Plante, Jordan Mirocha, Adélie Gorce, Adam Lidz, Aaron Parsons

摘要:

21 cm场与星系分布之间的互相关是再电离时代(EoR)的一个潜在探测器。21厘米的信号跟踪中性气体在星系际介质中,在大的空间尺度上,这应该是反相关的高红移星系分布的部分来源和跟踪电离气体。在不久的将来,预计氢再电离时代阵列(HERA)等干涉仪将提供21厘米功率谱的极其灵敏的测量。与此同时,南希·格蕾丝·罗曼太空望远镜(Roman)将产生迄今为止最广泛的EoR明亮星系目录。利用再电离的半数值模拟,我们探讨了在EoR期间测量21 cm和星系场之间的交叉功率谱的前景。我们预测14 $σ$检测HERA和罗马之间,假设一个重叠的调查区域500度$^2$,红移的$σ_z = 0.01$的不确定性(预期的高纬度光谱调查的Ly $α$发射星系),和一个有效的Ly $α$发射器占空比$f_\mathrm{LAE} = 0.1$。因此,HERA-Roman互功率谱可用于帮助验证HERA的21 cm探测。我们发现星系分布中的散粒噪声是检测的一个限制因素,因此使用Roman的补充观测应该优先考虑更深的观测,而不是覆盖更宽的视场。

英文摘要:

The cross-correlation between the 21 cm field and the galaxy distribution is a potential probe of the Epoch of Reionization (EoR). The 21 cm signal traces neutral gas in the intergalactic medium and, on large spatial scales, this should be anti-correlated with the high-redshift galaxy distribution which partly sources and tracks the ionized gas. In the near future, interferometers such as the Hydrogen Epoch of Reionization Array (HERA) are projected to provide extremely sensitive measurements of the 21 cm power spectrum. At the same time, the Nancy Grace Roman Space Telescope (Roman) will produce the most extensive catalog to date of bright galaxies from the EoR. Using semi-numeric simulations of reionization, we explore the prospects for measuring the cross-power spectrum between the 21 cm and galaxy fields during the EoR. We forecast a 14$σ$ detection between HERA and Roman, assuming an overlapping survey area of 500 deg$^2$, redshift uncertainties of $σ_z = 0.01$ (as expected for the high-latitude spectroscopic survey of Ly$α$-emitting galaxies), and an effective Ly$α$ emitter duty cycle of $f_\mathrm{LAE} = 0.1$. Thus the HERA-Roman cross-power spectrum may be used to help verify 21 cm detections from HERA. We find that the shot-noise in the galaxy distribution is a limiting factor for detection, and so supplemental observations using Roman should prioritize deeper observations, rather than covering a wider field of view.

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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