As seen in the previous section, th

As seen in the previous section, the sensitivities of terrestrial gravitational wave detectors at low frequencies are limited by seismic noise, and thus the performance of vibration isolation systems affects the detectability and measurability of low frequency gravitational waves. In order to detect the signals from low-frequency gravitational wave sources such as (intermediate mass) black hole binaries and pulsars with long rotation periods with a reasonable detection probability or observation time, it is required to expand the detection band as low frequency as 10 Hz. This section explains target gravitational wave sources and obtainable science goals in the detection of low-frequency gravitational waves.