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arXiv 2607.03345astro-ph.COgr-qc
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高红移大质量黑洞双星群体推断中的强引力透镜效应

Strong-lensing effects in high-redshift massive black-hole binary population inference

University of Chinese Academy of Sciences(中国科学院大学);Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences(中国科学院大学杭州高等研究院);Institute of Theoretical Physics, Chinese Academy of Sciences(中国科学院理论物理研究所);Shanghai Astronomical Observatory, Chinese Academy of Sciences(中国科学院上海天文台)

Yan-Heng Jin, Wen-Biao Han

AI总结:

研究高红移大质量黑洞双星合并受星系尺度强引力透镜影响,用四种形成通道计算有无透镜时LISA可探测事件数,比较不同透镜群体假设,表明强透镜效应影响事件混合及数量,推断时应考虑其影响。

摘要:

高红移大质量黑洞双星(MBHB)合并可探测黑洞种子形成和早期星系组装,但LISA探测的群体可能受星系尺度强引力透镜影响。我们量化了10≤z≤20时MBHB合并的这种效应,并评估其对固有形成通道分数推断的影响。……这些结果表明,在利用高红移MBHB探测推断固有形成通道分数时,应包括星系尺度强引力透镜效应和事件计数信息。

英文摘要:

High-redshift massive black-hole binary (MBHB) mergers provide a probe of black-hole seed formation and early galaxy assembly, but the population detected by LISA can be modified by galaxy-scale strong lensing. We quantify this effect for MBHB mergers at $10\leq z\leq20$ and assess its impact on the inference of intrinsic formation-channel fractions. We use four channels, corresponding to light- and heavy-seed scenarios with delayed and non-delayed mergers, and compute 4-year LISA-detectable event numbers with and without strong lensing. To bracket the uncertain lens population, we compare a conservative velocity-dispersion-function (VDF) prescription with an optimistic halo-mass-function (HMF)-based prescription. We consider a reference mixture with equal seed-channel weights and additional mixtures in which the intrinsic seed population is weighted toward selected formation channels, and jointly infer the formation fractions and the strength of the lensing contribution. Strong lensing does not affect all channels equally: it can change the detected channel mixture as well as the total number of detections. This effect is weak for the conservative VDF prescription, but becomes significant in the high-lensing-rate HMF case, where neglecting strong lensing can bias the recovered formation fractions. The inference precision depends on the underlying intrinsic channel composition, while the lensing contribution is more accurately recovered in the high-lensing-rate case. These results indicate that galaxy-scale strong-lensing effects and event-count information should be included when using high-redshift MBHB detections to infer intrinsic formation-channel fractions.

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