Abstract Details
| Name: Saptarshi Sarkar Affiliation: National Centre for Radio Astrophysics - Tata Institute of Fundamental Research (NCRA-TIFR), Pune Conference ID: ASI2025_280 Title : Giant pulse detection from a transitional millisecond pulsar Authors and Co-Authors : Saptarshi Sarkar 1, Jayanta Roy 1 Abstract Type : Poster Abstract Category : High Energy Phenomena, Fundamental Physics and Astronomy Abstract : Giant pulses (GPs) are intense, sporadic bursts emitted by a subset of radio pulsars, offering key insights into high-energy processes in pulsar magnetospheres. We will present the first detection of GPs from PSR J1227-4853, a rare transitional millisecond pulsar (tMSP) and one of only three known tMSPs, discovered with the Giant Metrewave Radio Telescope (GMRT). Over 162 hours of observation, we detected 204 GPs from PSR J1227-4853, establishing it as a new GP source. Our results reveal a correlation between GP emissions and the pulsar’s image flux density, as well as both its orbital and pulse phases, with most GPs occurring near eclipse boundaries—suggesting potential plasma lensing effects. We observed significant flux density variations across different pulse phase components, with one component displaying a power-law fluence distribution, a characteristic shared with other GP-emitting pulsars. Uniquely, no GPs were detected in the interpulse region, distinguishing this source from other pulsars where GPs are emitted at both main and interpulse phases. The waiting time distribution during an exceptionally active epoch showed clustered emissions with a Weibull index and power-law fluence distribution similar to those observed in fast radio bursts (FRBs), such as FRB 20200120E located within a Globular Cluster. This similarity in both Weibull and power-law indices supports the hypothesis that GP-emitting tMSPs may serve as progenitors for certain FRBs. Our findings provide new insights into the mechanisms of GP emission and their potential links to FRBs, advancing our understanding of extreme astrophysical phenomena within pulsar magnetospheres. |