论文标题
通过HERA I期观察到的21厘米EOR功率谱和IGM的X射线加热的改进约束
Improved Constraints on the 21 cm EoR Power Spectrum and the X-Ray Heating of the IGM with HERA Phase I Observations
论文作者
论文摘要
我们使用94晚观测到回电阵列（HERA）的I期观察到21 cm时期的21厘米时期的上限最敏感的上限。使用类似的分析技术，如先前报道的限制（HERA协作2022a），我们发现$ 95％的信心是$δ^2（k = 0.34 $ $ $ $ $ h $ mpc $^{ - 1} $）$ \ leq 457 $ mk $ mk $^2 $ at $ z = 7.9 $ = 7.9 $ and $δ^2（k = 0.36 $ h $ h $ h $ h $ h $ h $ h $ h = 0.36 $ MPC^） 3,496 $ mk $^2 $ at $ z = 10.4 $，改善了2.1倍和2.6倍。尽管进行了相对保守的分析，旨在最大程度地减少信号损失，但这些限制与$ K $范围内的热噪声大多与热噪声一致。我们的结果通过对数据和端到端管道模拟的两个统计检验进行了验证。我们还报告了对电离和宇宙黎明的天体物理学的最新限制。使用HERA协作（2022b）先前采用的多种独立的建模和推理技术，我们发现播层间培养基必须至少在$ z = 10.4 $的最早至少以上的绝热冷却极限上面加热，排除了一套所谓的“冷回电”风景。通常认为，如果这种加热是由于宇宙黎明期间的高质量X射线二进制物引起的，那么我们的结果的99％可靠间隔不包括软X射线光度和恒星形成之间的局部关系，因此需要由进化的低水平星体驱动的加热。
We report the most sensitive upper limits to date on the 21 cm epoch of reionization power spectrum using 94 nights of observing with Phase I of the Hydrogen Epoch of Reionization Array (HERA). Using similar analysis techniques as in previously reported limits (HERA Collaboration 2022a), we find at 95% confidence that $Δ^2(k = 0.34$ $h$ Mpc$^{-1}$) $\leq 457$ mK$^2$ at $z = 7.9$ and that $Δ^2 (k = 0.36$ $h$ Mpc$^{-1}) \leq 3,496$ mK$^2$ at $z = 10.4$, an improvement by a factor of 2.1 and 2.6 respectively. These limits are mostly consistent with thermal noise over a wide range of $k$ after our data quality cuts, despite performing a relatively conservative analysis designed to minimize signal loss. Our results are validated with both statistical tests on the data and end-to-end pipeline simulations. We also report updated constraints on the astrophysics of reionization and the cosmic dawn. Using multiple independent modeling and inference techniques previously employed by HERA Collaboration (2022b), we find that the intergalactic medium must have been heated above the adiabatic cooling limit at least as early as $z = 10.4$, ruling out a broad set of so-called "cold reionization" scenarios. If this heating is due to high-mass X-ray binaries during the cosmic dawn, as is generally believed, our result's 99% credible interval excludes the local relationship between soft X-ray luminosity and star formation and thus requires heating driven by evolved low-metallicity stars.
