Astrophysics of gravitational-wave sources
There are a large number of possible gravitational-wave sources in the observable waveband, which spans eight orders of magnitude in frequency: from 10 −4 Hz (lower bound of current space-based detector designs) to 10 4 Hz (frequency limit of likely ground-based detectors). Some of these sources are highly relativistic and not too massive, especially above 10 Hz: a black hole of mass 1000M has a characteristic frequency of 10 Hz, and larger holes have lower frequencies in inverse proportion to the mass. Neutron stars have even higher characteristic frequencies. Other systems are well described by Newtonian dynamics, such as binary orbits.