论文标题
GW190426_152155：中子星黑洞还是低质量二进制黑洞的合并？
GW190426_152155: a merger of neutron star-black hole or low mass binary black holes?
论文作者
论文摘要
GW190426_152155 was recently reported as one of the 39 candidate gravitational wave (GW) events in \citet{2020arXiv201014527A}, which has an unusual source-frame chirp mass $\sim 2.4M_{\odot}$ and may be the first GW signal from a neutron star-black hole (NSBH) merger.假设天体物理学起源，我们使用具有不同特征的几种波形重新分析了GW190426_152155，并考虑了二进制（均匀和logiform）质量比的两个不同的先验。我们发现结果受质量比的先验影响，该候选者也可能来自两个低质量黑洞（BH）的合并。在二进制黑洞（BBH）合并的情况下，有效自旋可能为负，有效的进动自旋不可忽略。至于NSBH合并，假设光对象的质量遵循具有合理测量/约束质量的当前中子星（NSS）的分布，那么低质量BH的自旋是如此之小，很难产生明亮的电磁发射。最后，我们估计GW190426 \ _152155的合并速率为$ 59^{+137} _ { - 51}〜{\ rm gpc}^{ - 3} { - 3}〜
GW190426_152155 was recently reported as one of the 39 candidate gravitational wave (GW) events in \citet{2020arXiv201014527A}, which has an unusual source-frame chirp mass $\sim 2.4M_{\odot}$ and may be the first GW signal from a neutron star-black hole (NSBH) merger. Assuming an astrophysical origin, we reanalyze GW190426_152155 using several waveforms with different characteristics, and consider two different priors for the mass ratio of the binary (Uniform and LogUniform). We find that the results are influenced by the priors of mass ratio, and this candidate could also be from the merger of two low mass black holes (BH). In the case for a binary black hole (BBH) merger, the effective spin is likely negative and the effective precession spin is non-negligible. As for the NSBH merger, supposing the mass of the light object follow the distribution of current neutron stars (NSs) with a reasonably measured/constrained mass, the spin of the low mass BH is so small that is hard to generate bright electromagnetic emission. Finally, we estimate a merger rate of GW190426\_152155-like systems to be $59^{+137}_{-51}~{\rm Gpc}^{-3}~{\rm yr}^{-1}$.
