引力微透镜事件中GW150914-like透镜的二值性探测
Detecting binarity of GW150914-like lenses in gravitational microlensing events
摘要：
最近发现的来自恒星质量双黑洞（BBH）的引力波（GW）为这些系统的存在提供了直接证据。BBH透镜将具有与单透镜信号不同的引力微透镜特征。我们应用贝叶斯统计研究BBH微透镜事件从单透镜事件在理想的观测条件下，使用韩国微透镜望远镜网络的测光能力的可扩展性。经过一年的观测，银河系中心的一颗源星，一个类似GW 150914的BBH透镜，（总质量65 M $_\odot$，质量比0.8）在一半的距离，和一个碰撞参量为0.4爱因斯坦半径，我们发现，二重性是可检测的BBH分离到0.0250爱因斯坦半径，这几乎是宇宙年龄内这类BBH合并的最大距离的3.5倍。因此，微透镜搜索比GW搜索对更广泛分离的BBH敏感，也许可以发现在不同通道的二元形成中产生的BBH种群。
英文摘要：
The recent discovery of gravitational waves (GWs) from stellar-mass binary black holes (BBHs) provided direct evidence of the existence of these systems. BBH lenses would have gravitational microlensing signatures that are distinct from single-lens signals. We apply Bayesian statistics to examine the distinguishability of BBH microlensing events from single-lens events under ideal observing conditions, using the photometric capabilities of the Korean Microlensing Telescope Network. Given one year of observations, a source star at the Galactic Centre, a GW150914-like BBH lens (total mass 65M$_\odot$, mass ratio 0.8) at half that distance, and an impact parameter of 0.4 Einstein radii, we find that binarity is detectable for BBHs with separations down to 0.0250 Einstein radii, which is nearly 3.5 times greater than the maximum separation for which such BBHs would merge within the age of the Universe. Microlensing searches are thus sensitive to more widely separated BBHs than GW searches, perhaps allowing the discovery of BBH populations produced in different channels of binary formation.
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