Speaker
Description
Coalescing supermassive black hole binaries (SMBHBs) are the primary source candidates for low frequency gravitational wave (GW) detections, which could bring us deep insights into galaxy evolutions over cosmic time and violent processes of spacetime dynamics. Promising candidates had been found based on optical and X-ray observations, which claims for new and ready-to-use GW detection approaches before the operations of space-borne antennas. We show that, satellite orbit resonance effects in satellite laser ranging systems, intersatellite ranging systems and lunar ranging systems could serve as probes of coalescing SMBHBs in the micro-Hertz band. Lasting and characteristic imprints caused by such resonances in the residual distances or accelerations from such ranging measurements are studied, and the detection SNR is analyzed with both the current and future improved ranging precisions. For SLR missions, within redshift z ∼ 1, the threshold SNR = 5 requires 1–2 years of accumulated data for the current precision and months of data for improved precision, which are workable for the data processing. Such a detection scheme could fulfill the requirement of a tentative SMBHB probe during the preparing stage of LISA and Taiji, and it requires no further investment to any new and advanced facilities. It is also worthwhile to look back and re-process the archived data from the past decades, in where resonant signals from SMBHBs might be hidden.
