论文标题
Ligo二进制黑洞的有效自旋分布的趋势
A trend in the effective spin distribution of LIGO binary black holes with mass
论文作者
论文摘要
通过重力波（GW）观察检测到的二进制黑洞（BBHS）可以广泛分为两个地层通道：通过田间二元进化形成的二进制波（GW）观察结果，这些通道和在密集的恒星系统中动态组装的二进制式观测值。这些地层通道及其子渠道中的每一个都在有效的自旋质量（$χ_ {\ rm eff} -m $）平面中填充一个不同的区域。根据不同通道的分支比率，BBH的集合可能显示出该平面的趋势。在这里，我们将$χ_ {\ rm eff} $的质量依赖分布与高级Ligo和Advanced Pirogo的第一个和第二个观察跑相中的GWTC-1 BBHS。我们发现质量与平均有效自旋之间的负相关（$ \barχ_ {\ mathrm {eff}} $），并在75 \％和80 \％的信心下（$σ_{χ_\ Mathrm {eff}} $）正相关（$σ_{χ_\ Mathrm {eff}} $）。这种趋势与选择质量变量的选择是强大的，但是当质量变量被视为二进制的chirp质量时，最明显的是。结果与GWTC-1目录中动态组装和现场二进制的重要贡献一致。即将到来的LIGO O3A数据发布将严格测试此解释。
Binary black holes (BBHs) detected by gravitational wave (GW) observations could be broadly divided into two formation channels: those formed through field binary evolution and those assembled dynamically in dense stellar systems. Each of these formation channels, and their sub-channels, populate a distinct region in the effective spin-mass ($χ_{\rm eff}-M$) plane. Depending on the branching ratio of different channels, an ensemble of BBHs could show a trend in this plane. Here we fit a mass-dependent distribution for $χ_{\rm eff}$ to the GWTC-1 BBHs from the first and second observing runs of Advanced LIGO and Advanced Virgo. We find a negative correlation between mass and the mean effective spin ($\barχ_{\mathrm{eff}}$), and positive correlation with its dispersion ($σ_{χ_\mathrm{eff}}$) at 75\% and 80\% confidence. This trend is robust against the choice of mass variable, but most pronounced when the mass variable is taken to be the chirp mass of the binary. The result is consistent with significant contributions from both dynamically assembled and field binaries in the GWTC-1 catalog. The upcoming LIGO O3a data release will critically test this interpretation.
