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arXiv 2201.12516astro-ph.HE
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利用LISA-Taiji网络探测恒星双星黑洞

On Detecting Stellar Binary Black Holes via the LISA-Taiji Network

Ju Chen, Changshuo Yan, Youjun Lu, Yuetong Zhao, Junqiang Ge

摘要:

地基激光干涉仪GW天文台(LIGO/Virgo)对引力波(GW)的探测揭示了恒星二元黑洞(sBBH)群,其(总)质量高达$\sim 150M_\odot$,这是LISA和Taiji等空基GW探测器的潜在来源。在本文中,我们详细研究了未来的LISA-Taiji网络检测sBBHs的可能性。我们采用LIGO/VIRGO观测约束的sBBH合并率密度随机生成模拟sBBH样本。假设观测周期为$4$年,我们发现LISA-Taiji网络可以检测到几十个(或至少几个)信噪比(SNR)为$>8$(或$>15$)的sBBH,比仅使用LISA或Taiji观测值的信噪比大$2-3$倍。在这些sBBH中,只有少数可以在$4$年的观察期内合并。如果将观测周期扩展到$10$年,则LISA-Taiji网络可以检测到大约一百个(或二十个)具有SNR $>8$(或$>15$)的sBBH,其中大约二十个(或至少几个)可以在观测周期内合并。我们的研究结果表明,即使假设保守的SNR阈值($15$)用于“检测”,LISA-Taiji网络也可能能够检测到至少少数到二十个或更多的sBBH,这使得空间和地面GW探测器能够进行多波段GW观测。我们还进一步估计了由LISA-Taiji网络“检测”的sBBH系统的参数估计的不确定性。我们发现,在光度距离测量和天空定位的相对误差主要是在$0.05-0.2$和$1-100°^2$的范围内,分别为这些sBBH。

英文摘要:

The detection of gravitational waves (GWs) by ground-based laser interferometer GW observatories (LIGO/Virgo) reveals a population of stellar binary black holes (sBBHs) with (total) masses up to $\sim 150M_\odot$, which are potential sources for space-based GW detectors, such as LISA and Taiji. In this paper, we investigate in details on the possibility of detecting sBBHs by the LISA-Taiji network in future. We adopt the sBBH merger rate density constrained by LIGO/VIRGO observations to randomly generate mock sBBHs samples. Assuming an observation period of $4$ years, we find that the LISA-Taiji network may detect several tens (or at least several) sBBHs with signal-to-noise ratio (SNR) $>8$ (or $>15$), a factor $2-3$ times larger than that by only using LISA or Taiji observations. Among these sBBHs, no more than a few that can merge during the $4$-year observation period. If extending the observation period to $10$ years, then the LISA-Taiji network may detect about one hundred (or twenty) sBBHs with SNR $>8$ (or $>15$), among them about twenty (or at least several) can merge within the observation period. Our results suggest that the LISA-Taiji network may be able to detect at least a handful to twenty or more sBBHs even if assuming a conservative SNR threshold ($15$) for ``detection'', which enables multi-band GW observations by space and ground-based GW detectors. We also further estimate the uncertainties in the parameter estimations of the sBBH systems ``detected'' by the LISA-Taiji network. We find that the relative errors in the luminosity distance measurements and sky localization are mostly in the range of $0.05-0.2$ and $1-100°^2$, respectively, for these sBBHs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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