论文标题
GW190521可能是中间质量比Inspiral
GW190521 may be an intermediate mass ratio inspiral
论文作者
论文摘要
GW190521是对二进制黑洞合并的第一个自信观察，与总质量$ m> 100 \，\ mathrm {m} _ {\ odot} $。鉴于这些质量缺乏观察性约束，我们分析了GW190521考虑了二元质量的两个不同的先验：质量比和源框架总质量均匀，而源框架组分质量均匀。对于质量比率的统一，我们发现组件质量为$ m_1^{\ mathrm {src}} = 168 _ { - 61}^{+15} \，\ Mathrm {m Mathrm {m} _ {\ odot} 16 _ { - 3}^{+33} \，\ mathrm {m} _ {\ odot} $。组分质量均匀的统一产生双峰后分布。有一个低质量比例模式（$ q <4 $），带有$ M_1^{\ Mathrm {src}}} = 100 _ { - 18}^{+17} \，\ Mathrm {M Mathrm {m} _ {\ odot} $ 57 _ { - 16}^{+17} \，\ Mathrm {m} _ {\ odot} $和高质量比例模式（$ q \ geq4 $），带有$ M_1^{\ Mathrm {src}}} = 166 _ { - 35}^{+16} \，\ Mathrm {M} _ {\ odot} $和$ M_2^{\ Mathrm {\ Mathrm {src}} = 16 _ { - 3}^{ - 3}^{+14}^{+14}^{+14} \，\，\，\ Mathrm {m {m {m} _}尽管这两种模式几乎具有相等的后率概率，但最大样本参数处于高质量比模式，$ m_1^{\ rm src} = 171 \，m _ {\ odot} $和$ m_2^{\ m_2^{\ rm src} = 16 \ rm src} = 16 \ \，m _ aimise aimise aimise aimise and $ y;这些结果与超新星配对稳定产生的建议的“质量差距”一致。我们的结果与Abbott等人发表的结果不同。 （2020b）。我们发现，先验使用的结合和所应用的约束可能阻止了对高质量比率模式进行采样的分析。 Zwicky瞬态设施（ZTF）观察到AGN J124942.3+344929中的积聚耀斑。我们报告参数假设有共同的起源；但是，仅GW190521和EM耀斑的空间协议并不能为协会提供令人信服的证据（$ \ ln \ Mathcal {b} \ gtrsim -4 $）。
GW190521 is the first confident observation of a binary black hole merger with total mass $M > 100\,\mathrm{M}_{\odot}$. Given the lack of observational constraints at these masses, we analyze GW190521 considering two different priors for the binary's masses: uniform in mass ratio and source-frame total mass, and uniform in source-frame component masses. For the uniform in mass-ratio prior, we find that the component masses are $m_1^{\mathrm{src}} = 168_{-61}^{+15}\,\mathrm{M}_{\odot}$ and $m_2^{\mathrm{src}} = 16_{-3}^{+33}\,\mathrm{M}_{\odot}$. The uniform in component-mass prior yields a bimodal posterior distribution. There is a low-mass-ratio mode ($q<4$) with $m_1^{\mathrm{src}} = 100_{-18}^{+17}\,\mathrm{M}_{\odot}$ and $m_2^{\mathrm{src}} = 57_{-16}^{+17}\,\mathrm{M}_{\odot}$ and a high-mass-ratio mode ($q\geq4$) with $m_1^{\mathrm{src}} = 166_{-35}^{+16}\,\mathrm{M}_{\odot}$ and $m_2^{\mathrm{src}} = 16_{-3}^{+14}\,\mathrm{M}_{\odot}$. Although the two modes have nearly equal posterior probability, the maximum-likelihood parameters are in the high-mass ratio mode, with $m_1^{\rm src} = 171\,M_{\odot}$ and $m_2^{\rm src} = 16\,M_{\odot}$, and a signal-to-noise ratio of $16$. These results are consistent with the proposed "mass gap" produced by pair-instability in supernova. Our results differ from those published in Abbott et al. (2020b). We find that a combination of the prior used and the constraints applied may have prevented that analysis from sampling the high-mass-ratio mode. An accretion flare in AGN J124942.3+344929 was observed in possible coincidence with GW190521 by the Zwicky Transient Facility (ZTF). We report parameters assuming a common origin; however, the spatial agreement of GW190521 and the EM flare alone does not provide convincing evidence for the association ($\ln\mathcal{B} \gtrsim -4$).
