Expanding the LISA Horizon from the Ground

被引:40
|
作者
Wong, Kaze W. K. [1 ]
Kovetz, Ely D. [1 ]
Cutler, Curt [2 ,3 ]
Berti, Emanuele [1 ,4 ]
机构
[1] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[2] CALTECH, Theoret Astrophys, Pasadena, CA 91125 USA
[3] Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA
[4] Univ Mississippi, Dept Phys & Astron, University, MS 38677 USA
关键词
BLACK-HOLE MERGERS; GRAVITATIONAL-WAVES; ECCENTRIC SOURCES; PARAMETERS;
D O I
10.1103/PhysRevLett.121.251102
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The Laser Interferometer Space Antenna (LISA) gravitational-wave (GW) observatory will be limited in its ability to detect mergers of binary black holes (BBHs) in the stellar-mass range. A future ground-based detector network, meanwhile, will achieve by the LISA launch date a sensitivity that ensures complete detection of all mergers within a volume > O(10) Gpc(3). We propose a method to use the information from the ground to revisit the LISA data in search for subthreshold events. By discarding spurious triggers that do not overlap with the ground-based catalogue, we show that the signal-to-noise threshold rho(LISA) employed in LISA can be significantly lowered, greatly boosting the detection rate. The efficiency of this method depends predominantly on the rate of false-alarm increase when the threshold is lowered and on the uncertainty in the parameter estimation for the LISA events. As an example, we demonstrate that while all current LIGO BBH-merger detections would have evaded detection by LISA when employing a standard rho(LISA) = 8 threshold, this method will allow us to easily (possibly) detect an event similar to GW150914 (GW170814) in LISA. Overall, we estimate that the total rate of stellar-mass BBH mergers detected by LISA can be boosted by a factor similar to 4 (greater than or similar to 8) under conservative (optimistic) assumptions. This will enable new tests using multiband GW observations, significantly aided by the greatly increased lever arm in frequency.
引用
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页数:6
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