International Pulsar Timing Array Consortium for Nano-Hertz GW Astronomy
(Tata Institute of Fundamental Research)
Supermassive Black Holes (SMBHs) thrive at the centres of massive galaxies and galaxy mergers can lead to SMBH binaries with orbital periods of years. Such systems emit nano-hertz gravitational waves (GWs) which can be detected by employing networks of precisely timed milli-second pulsars. The rapidly maturing Pulsar Timing Arrays like NANOGrav, EPTA, InPTA and PPTA, are expected to detect and characterise such GWs in the very near future under the auspices of the International Pulsar Timing Array (IPTA) consortium. I will provide a brief introduction to GWs, theoretical aspects of PTAs and argue how we may be able to pursue Persistent multi-messenger nano-hertz GW astronomy during the Square Kilometre Array Era.