SKA时代观测高红移射电噪类星体的前景：为21厘米森林观测铺平道路
Prospects for Observing High-redshift Radio-loud Quasars in the SKA Era: Paving the Way for 21-cm Forest Observations
AI总结：
本文用物理驱动模型预测SKA时代高红移射电噪类星体数量，指出恒定射电噪比例下SKA-LOW一年巡天可在z~9发现约20个适合21厘米森林研究的源。
摘要：
21厘米森林是探测再电离时期（EoR）早期加热过程和小尺度结构的灵敏探针，将由即将建成的平方公里阵列（SKA）实现。其探测依赖于射电明亮背景源的可用性，其中射电噪类星体极具前景，但由于观测有限，它们在EoR期间的丰度仍受到很差的约束。本文使用物理驱动模型预测未来的射电噪类星体观测。我们利用高红移类星体的观测数据拟合模型参数。在爱丁顿吸积假设下，该模型给出z~6处类星体的平均寿命为$t_{\rm q}\sim10^{5.3}$年，这与近期由类星体邻近区预研究得到的结果一致。我们表明，如果类星体的射电噪比例随红移演化，将显著减少SKA时代可观测射电噪类星体的丰度，使21厘米森林研究具有挑战性。在恒定射电噪比例下，我们的模型表明，使用SKA-LOW进行一年的巡天有能力在z~9处探测到约20个射电噪类星体，并具有足以分辨单个21厘米森林谱线的灵敏度。
英文摘要：
The 21-cm forest is a sensitive probe for the early heating process and small-scale structures during the epoch of reionization (EoR), to be realized with the upcoming Square Kilometre Array (SKA). Its detection relies on the availability of radio-bright background sources, among which the radio-loud quasars are very promising, but their abundance during the EoR is still poorly constrained due to limited observations. Here, we use a physics-driven model to forecast future radio-loud quasar observations. We fit the parameters of the model using observational data of high-redshift quasars. Assuming Eddington accretion, the model yields an average lifetime of $t_{\rm q} \sim 10^{5.3}$yr for quasars at $z\sim6$, consistent with recent results obtained from quasar proximity zone pre-study. We show that if the radio-loud fraction of quasars evolves with redshift, it will significantly reduce the abundance of observable radio-loud quasars in the SKA era, making 21-cm forest studies challenging. With a constant radio-loud fraction, our model suggests that a one-year sky survey conducted with SKA-LOW has the capability to detect approximately 20 radio-loud quasars at $z\sim 9$, with sufficient sensitivity to resolve individual 21-cm forest lines.
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。
