超大质量黑洞双星LISA波段中极端质量比吸进的增强种群

IF 8.8 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Astrophysical Journal Letters Pub Date : 2023-09-26 DOI:10.3847/2041-8213/acf8c9
Smadar Naoz, Zoltán Haiman
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引用次数: 0

摘要

当一个恒星质量黑洞(BH)与一个超大质量黑洞(SMBH)合并时,会发生极端质量比吸气(EMRIs)。未来的激光干涉仪空间天线(LISA)和其他毫赫探测器有望探测到这种事件产生的引力波。最近有人提出,SMBH双星系统中的EMRI率比具有相同总质量的单个SMBH周围的EMRI率高几个数量级。在这里,我们证明了这种高速率可以在红移为1的情况下产生数千个SMBH-BH源。我们预测,在4年的任务寿命内,LISA可能会探测到几百个信噪比高于S/N≥8的emri。剩余的亚阈值源将产生较大的混淆噪声,大约比LISA的灵敏度水平高一个数量级。最后,我们建议单独可探测的系统,以及来自亚阈值EMRIs的背景噪声,可以用来约束低红移宇宙中的SMBH二元分数。
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The Enhanced Population of Extreme Mass-ratio Inspirals in the LISA Band from Supermassive Black Hole Binaries
Abstract Extreme mass-ratio inspirals (EMRIs) take place when a stellar-mass black hole (BH) merges with a supermassive BH (SMBH). The gravitational-wave emission from such an event is expected to be detectable by the future Laser Interferometer Space Antenna (LISA) and other millihertz detectors. It was recently suggested that the EMRI rate in SMBH binary systems is orders of magnitude higher than the EMRI rate around a single SMBH with the same total mass. Here we show that this high rate can produce thousands of SMBH–BH sources at a redshift of unity. We predict that LISA may detect a few hundred of these EMRIs with signal-to-noise ratio above S/N ≥8 within a 4 yr mission lifetime. The remaining subthreshold sources will contribute to a large confusion noise, which is approximately an order of magnitude above LISA’s sensitivity level. Finally, we suggest that the individually detectable systems, as well as the background noise from the subthreshold EMRIs, can be used to constrain the SMBH binary fraction in the low-redshift Universe.
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来源期刊
Astrophysical Journal Letters
Astrophysical Journal Letters ASTRONOMY & ASTROPHYSICS-
CiteScore
14.10
自引率
6.30%
发文量
513
审稿时长
2-3 weeks
期刊介绍: The Astrophysical Journal Letters (ApJL) is widely regarded as the foremost journal for swiftly disseminating groundbreaking astronomical research. It focuses on concise reports that highlight pivotal advancements in the field of astrophysics. By prioritizing timeliness and the generation of immediate interest among researchers, ApJL showcases articles featuring novel discoveries and critical findings that have a profound effect on the scientific community. Moreover, ApJL ensures that published articles are comprehensive in their scope, presenting context that can be readily comprehensible to scientists who may not possess expertise in the specific disciplines covered.
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