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A pulsar timing array (PTA) is a set of galactic pulsars that is monitored and analyzed to search for correlated signatures in the pulse arrival times on Earth. As ...
The International Pulsar Timing Array (IPTA) is a multi-institutional, multi-telescope collaboration [1] comprising the European Pulsar Timing Array (EPTA), the North American Nanohertz Observatory for Gravitational Waves (NANOGrav), the Parkes Pulsar Timing Array (PPTA) in Australia, and the Indian Pulsar Timing Array Project (InPTA [2] [3]).
A pulsar timing array (PTA) uses an array of MSPs as the endpoints of a Galaxy-scale GW detector. It is sensitive to GWs with a frequency in the nanohertz regime, which corresponds to the regime where the stochastic GW background, caused by the coalescence of super-massive black holes in the early Universe, is predicted to exist.
In 2023, NANOGrav used pulsar timing array data collected over 15 years in their latest publications supporting the existence of a gravitational wave background. [1] A total of 2,211 millisecond pulsar pair combinations (67 individual pulsars) were used by the NANOGrav team to construct their Hellings-Downs plot comparison. [14]
The advent of state-of-the-art digital data acquisition systems, new radio telescopes and receiver systems and the discoveries of many new pulsars advanced the sensitivity of the pulsar timing array to gravitational waves. The 2010 paper by Hobbs et al. [8] summarizes the early state of the international effort.
Vital component of the Parkes Pulsar Timing Array [22] programme to detect gravity waves as part of the broader International Pulsar Timing Array (IPTA), which also includes the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) and the European Pulsar Timing Array (EPTA).
PSR J0437−4715 is a pulsar. Discovered in the Parkes 70 cm survey, [5] it remains the closest and brightest millisecond pulsar (MSP) known. The pulsar rotates about its axis 173.7 times per second and therefore completes a rotation every 5.75 milliseconds. It emits a searchlight-like radio beam that sweeps past the Earth each time it rotates.
English: The sketch shows the detection of a en:Gravitational wave with a en:Pulsar timing array in a schematic way. The pulsars P1 ... Pn are sending signals periodically, which are received on Earth. A gravitational wave (GW) changes the distance, earth (E) - pulsar; while the distance changes, also the time between pulses change.