Gravitational waves from binary supermassive black holes missing in pulsar observations
MetadataShow full item record
Gravitational waves are expected to be radiated by supermassive black hole binaries formed during galaxy mergers. A stochastic superposition of gravitational waves from all such binary systems would modulate the arrival times of pulses from radio pulsars. Using observations of millisecond pulsars obtained with the Parkes radio telescope, we constrained the characteristic amplitude of this background, Acyr, to be <1.0 × 10-15 with 95% confidence.This limit excludes predicted ranges for Acyr from current models with 91 to 99.7% probability. We conclude that binary evolution is either stalled or dramatically accelerated by galactic-center environments and that higher-cadence and shorterwavelength observations would be more sensitive to gravitational waves.
Showing items related by title, author, creator and subject.
Binary supermassive black hole environments diminish the gravitational wave signal in the pulsar timing bandRavi, V.; Wyithe, J.; Shannon, Ryan; Hobbs, G.; Manchester, R. (2014)We assess the effects of supermassive black hole (SMBH) environments on the gravitational wave (GW) signal from binary SMBHs. To date, searches with pulsar timing arrays for GWs from binary SMBHs, in the frequency band ...
Shannon, Ryan (2015)© International Astronomical Union 2016.By monitoring the arrival times from millisecond pulsars for years to decades, it is possible to search for, or place limits on, nanohertz frequency gravitational radiation. The ...
Prospects for gravitational-wave detection and supermassive black hole astrophysics with pulsar timing arraysRavi, V.; Wyithe, J.; Shannon, Ryan; Hobbs, G. (2015)Large-area sky surveys show that massive galaxies undergo at least one major merger in a Hubble time. Ongoing pulsar timing array (PTA) experiments are aimed at measuring the gravitational-wave (GW) emission from binary ...