Astrophysicists describe what galaxy-wide gravitational waves could mean for our understanding of black holes and the history of the cosmos.
to surrounding stars, slinging them out at high speed or simply dragging them around. As a result, the two black holes would eventually slow down and end up orbiting each other at distances of around 1 parsec, explains Chiara Mingarelli, a gravitational-wave astrophysicist at Yale University in New Haven, Connecticut.
Scientists will now seek to verify that the PTA signal does indeed come from binary supermassive black holes. If that could be confirmed, it would be evidence that supermassive black holes can come very close to each other in nature. As the black holes spiral inwards, the frequencies of their gravitational waves will increase and, in some cases, enter LISA’s spectrum of sensitivity. LISA will be sensitive to wavelengths of between 3 million km and 3 billion km — shorter than the wavelengths that can be detected by the PTAs, although still much longer than those seen by ground-based detectors. So LISA could see several of these mergers during its mission.
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