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A new insight into the origin of repeating FRB

January 8 @ 4:00 pm - 5:00 pm

Fast Radio Bursts (FRBs) are one of the most energetic and enigmatic events in the Universe. The origin of these sources is among the most challenging questions of modern-day astrophysics. Among the known FRBs, FRB121102 is the only source known to show repeated bursts which can allow a detailed investigation of various origin models. Earlier last year, we initiated a campaign to observe FRB 121102 using the Breakthrough Listen Digital Backend with the C-band receiver at the Robert C. Byrd Green Bank Telescope (GBT). We also applied state of the art machine learning approach with the Convolution Neural Network (CNN) and found a total of 92 new bursts. These observations are the highest frequency and widest bandwidth detection of bursts from FRB 121102 (or any other FRB) obtained to-date. We note that individual bursts show marked changes in spectral extent ranging from hundreds of MHz to several GHz. We also found distinctive temporal structures, a few microseconds wide in two of the strongest bursts, suggesting a very compact emission region. The most intriguing findings from these detections are a very high degree of rotation measures (~ 10^5 rad m-2) and nearly 100% linearly polarized bursts. I will discuss how these detections of FRB 121102 at higher frequencies point towards the origin of FRB 121102 from a compact object embedded in a highly magneto-ionic environment.Discipline/Coordinating Entity: Physics


January 8
4:00 pm - 5:00 pm
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