激励式双紧凑目标检测和透镜率--DECIGO和B-DECIGO的预测
Inspiraling double compact object detection and lensing rate -- forecast for DECIGO and B-DECIGO
摘要：
引力波（GW）天文学的出现重新唤起了人们对探索从地面无法到达的低频GW频谱的兴趣。GW卫星观测台DECIGO的原始配置和目前提议的较小规模B-DECIGO旨在覆盖GW频谱的分赫兹部分，这填补了地面探测器探测的LISA毫赫兹和十赫兹至千赫兹范围之间的空白。本文预测了DECIGO和B-DECIGO中吸入双紧凑目标（DCO）的检测率和来自这些源的未解决的混淆噪声。在DECIGO中，我们首次使用了NS-NS，BH-NS和BH-BH系统的种群合成内禀螺旋速率。我们还估计了预期的引力透镜率的DECIGO和B-DECIGO等源。结果是，DECIGO的DCO吸气的年度检测为$10^4 - 10^5$量级，而对于小得多的B-DECIGO，它们约为$10^2 - 10^4$，具体取决于所考虑的DCO人群。考虑到这些事件中有相当一部分可由地面GW观测站探测到，DECIGO/B-DECIGO的附加值可能很大。DECIGO还将能够配准$5-50$透镜式NS-NS吸气和最多O（100）BH-BH吸气。相反，对B-DECIGO的预测是悲观的：只有DCO形成的乐观的共同包络情景才能每年产生一些透镜BH-BH吸气。我们还讨论了在GW事件目录的DECIGO和B-DECIGO的放大偏差的问题。
英文摘要：
Emergence of gravitational wave (GW) astronomy revived the interest in exploring the low frequency GW spectrum inaccessible from the ground. Satellite GW observatory DECIGO in its original configuration and the currently proposed smaller scale B-DECIGO are aimed to cover deci-Hertz part of the GW spectrum, which fills the gap between LISA mili-Hertz and deca- to kilo-Hertz range probed by ground-based detectors. In this paper we forecast the detection rates of inspiraling double compact objects (DCOs) and the unresolved confusion noise from these sources in DECIGO and B-DECIGO. In the context of DECIGO we use, for the first time, the population synthesis intrinsic inspiral rates of NS-NS, BH-NS and BH-BH systems. We also estimate the expected gravitational lensing rates of such sources for DECIGO and B-DECIGO. The result is that yearly detection of DCOs inspirals for the DECIGO is of order of $10^4 - 10^5$, while for a much smaller scale B-DECIGO they are about $10^2 - 10^4$ depending on the DCO population considered. Taking into account that considerable part of these events would be detectable by ground-based GW observatories the added value of DECIGO/B-DECIGO could be substantial. DECIGO will also be able to register $5-50$ lensed NS-NS inspirals and up to O(100) BH-BH inspirals. On the contrary, predictions for the B-DECIGO are pessimistic: only the optimistic common envelope scenario of DCO formation could yield a few lensed BH-BH inspirals per year. We also address the question of the magnification bias in the GW event catalogs of DECIGO and B-DECIGO.
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