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~150 M⊙,which are potential so...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~150 M⊙,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 deg2,respectively,for these sBBHs.展开更多
2015年9月14日,美国激光干涉引力波天文台(LIGO)捕捉到了距离地球13亿光年外的一对双黑洞并合产生的引力波信号(GW150914)。经过长达数月的数据分析,LIGO团队确证了激光干涉仪在该引力波信号穿过时产生的大约是一亿亿分之一厘米尺度的...2015年9月14日,美国激光干涉引力波天文台(LIGO)捕捉到了距离地球13亿光年外的一对双黑洞并合产生的引力波信号(GW150914)。经过长达数月的数据分析,LIGO团队确证了激光干涉仪在该引力波信号穿过时产生的大约是一亿亿分之一厘米尺度的振荡变化,并于2016年2月11日对外公布了这项惊人发现。这是人类首次直接探测到爱因斯坦广义相对论预言的引力波信号,并证实了双黑洞的存在。引力波探测器为探测宇宙提供了不同于电磁波(光)的全新方法,现在我们不仅能用望远镜“看”缤纷多彩的宇宙,还能用引力波探测器“听”波澜壮阔的宇宙。2017年的诺贝尔物理学奖也因此颁给了对引力波探测作出杰出贡献的三位物理学家:雷纳·韦斯(Rainer Weiss)、基普·索恩(Kip Stephen Thorne)和巴里·巴里什(Barry Clark Barish)。展开更多
基金partly supported by the National Key R&D Program of China (Grant Nos. 2020YFC2201400, 2020SKA0120102, and 2016YFA0400704)the National Natural Science Foundation of China (Grant Nos. 11690024, 11873056, and 11991052)+1 种基金the Strategic Priority Program of the Chinese Academy of Sciences (Grant No. XDB 23040100)the Beijing Municipal Natural Science Foundation (Grant No. 1204038)
文摘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~150 M⊙,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 deg2,respectively,for these sBBHs.
文摘2015年9月14日,美国激光干涉引力波天文台(LIGO)捕捉到了距离地球13亿光年外的一对双黑洞并合产生的引力波信号(GW150914)。经过长达数月的数据分析,LIGO团队确证了激光干涉仪在该引力波信号穿过时产生的大约是一亿亿分之一厘米尺度的振荡变化,并于2016年2月11日对外公布了这项惊人发现。这是人类首次直接探测到爱因斯坦广义相对论预言的引力波信号,并证实了双黑洞的存在。引力波探测器为探测宇宙提供了不同于电磁波(光)的全新方法,现在我们不仅能用望远镜“看”缤纷多彩的宇宙,还能用引力波探测器“听”波澜壮阔的宇宙。2017年的诺贝尔物理学奖也因此颁给了对引力波探测作出杰出贡献的三位物理学家:雷纳·韦斯(Rainer Weiss)、基普·索恩(Kip Stephen Thorne)和巴里·巴里什(Barry Clark Barish)。
