Dynamical Formation Scenarios for GW190521 and Prospects for Decihertz Gravitational-wave Astronomy with GW190521-like Binaries
Dynamical Formation Scenarios for GW190521 and Prospects for Decihertz Gravitational-wave Astronomy with GW190521-like Binaries
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DOI：
10.3847/2041-8213/abe7f5
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发表时间：
2020-12
期刊：
影响因子：
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通讯作者：
A. M. Holgado;Alexis Ortega;C. Rodriguez
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文献类型：
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作者：
A. M. Holgado;Alexis Ortega;C. Rodriguez
GW190521的引力波探测为黑洞的质量分布和天体物理形成通道提供了新的约束条件。由于GW190521的独立声明具有显著的合并前偏心，我们研究了这对动态形成的GW190521类双星意味着什么。激光干涉仪空间天线（LISA）也将对类似gw190521的双星敏感，如果它们是从一个孤立的形成通道形成的圆形。然而，像gw190521这样动态形成的二进制可能会完全跳过LISA波段。为此，我们模拟了通过后牛顿双单散射动态形成的GW190521类似物。从这些散射实验中，我们发现类似gw190521的双星可能像最近的研究表明的那样带着显著的偏心率进入LIGO-Virgo波段，尽管偏心率远低于e10 Hz > 0.7。像gw190521这样的偏心双星进一步激发了天体物理科学对dec赫兹GW天文台的研究，比如中频原子引力波干涉传感器的千米尺度版本。我们进行了Fisher分析来估计gw190521类双星的偏心率可以用这种dec赫兹探测器约束到什么程度。这些偏心约束也将为gw190521类双星形成的可能环境提供额外的见解。
The gravitational-wave (GW) detection of GW190521 has provided new insights on the mass distribution of black holes and new constraints for astrophysical formation channels. With independent claims of GW190521 having significant premerger eccentricity, we investigate what this implies for GW190521-like binaries that form dynamically. The Laser Interferometer Space Antenna (LISA) will also be sensitive to GW190521-like binaries if they are circular from an isolated formation channel. However, GW190521-like binaries that form dynamically may skip the LISA band entirely. To this end, we simulate GW190521 analogs that dynamically form via post-Newtonian binary–single scattering. From these scattering experiments, we find that GW190521-like binaries may enter the LIGO-Virgo band with significant eccentricity as suggested by recent studies, though well below an eccentricity of e 10 Hz ≲ 0.7. Eccentric GW190521-like binaries further motivate the astrophysical science case for a decihertz GW observatory, such as the kilometer-scale version of the Midband Atomic Gravitational-wave Interferometric Sensor. We carry out a Fisher analysis to estimate how well the eccentricity of GW190521-like binaries can be constrained with such a decihertz detector. These eccentricity constraints would also provide additional insights into the possible environments that GW190521-like binaries form in.