Talk detail

Participant	Lu, Wenbin
Institution	California Institute of Technology - 1216 E California Blvd - Pasadena - California - USA

Session	GB1	Accepted	No	Order	Time
Talk	Oral abstract	Title	Radiation Mechanism of Fast Radio Bursts
Coauthors	Kumar, Pawan
Abstract	We first show that the progenitors of FRBs cannot be determined only by their event rate, duration and energetics. Understanding their radiation mechanism should provide the missing insights, which will be described. The high brightness temperatures (> 10^{35} K) of FRBs mean that the emission process must be coherent. Two general types of coherent radiation mechanisms are considered --- maser and the antenna mechanism. We use the observed properties of the repeater FRB 121102 to constrain the plasma conditions for these two mechanisms. We have looked into a wide variety of maser mechanisms operating in vacuum or plasma and find that none of them can explain the high luminosity of FRBs without invoking unrealistic or fine-tuned plasma conditions. The most favorable mechanism is the curvature emission by charge bunches, where the power comes from magnetic reconnection near the surface of a magnetar (B > 1e14 G).
Pdf file

Session	GB1	Accepted	No	Order	Time
Talk	Oral abstract	Title	The Radiation Mechanism of Fast Radio Bursts
Coauthors	Kumar, Pawan
Abstract	We first show that the progenitors of fast radio bursts (FRBs) cannot be uniquely determined only by their event rate, duration and energetics. Understanding their radiation mechanism should provide the missing insights, which will be described. The high brightness temperatures (> 10^{35} K) of FRBs mean that the emission process must be coherent. Two general types of coherent radiation mechanisms are considered --- maser and the antenna mechanism. We use the observed properties of the repeater FRB 121102 to constrain the plasma conditions for these two mechanisms. We have looked into a wide variety of maser mechanisms operating in vacuum or plasma and find that none of them can explain the high luminosity of FRBs without invoking unrealistic or fine-tuned plasma conditions. The most favorable mechanism is the curvature emission by charge bunches, where the power comes from magnetic reconnection near the surface of a magnetar (B > 10^{14} G).
Pdf file