Speaker
Description
Recent pulsar timing arrays (PTA) observations indicate evidence of a gravitational wave background (GWB) has been detected. If supermassive black holes (SMBHs) are indeed the primary source of this signal, future PTA observations, such as those from the Square Kilometer Array (SKA), are expected to simultaneously capture multiple continuous gravitational waves (CGWs) emitted by bright individual SMBH binaries alongside a gravitational wave background (GWB). To deal with this anticipated scenario in the SKA era, we revisit F-statistic, a detection method for single source signals in PTA datasets, and introduce a new modeling that accounts for unresolved GWs as a stochastic GWB. Here, we applied this improved F-statistic to the mock datasets that include both CGW and GWB and evaluated how accurately F-statistic can identify the parameters of CGW. As a result, we show our approach can successfully resolve the sky position and the amplitude of CGW when GWB is dominant compared to white noise. Considering the prospect of the precision for SKA and the future improvement of our approach, we discuss the possibility of establishing the realistic algorithm based on F-statistic toward future PTA measurements.
