Constraining the age of a magnetar possibly associated with FRB 121102

Abstract

The similarity of the host galaxy of FRB 121102 with those of long gamma-ray bursts and Type I super-luminous supernovae suggests that this FRB could be associated with a young magnetar. By assuming the FRB emission to be produced within the magnetosphere, we derive a lower limit on the age of the magnetar, after which GHz emission is able to escape freely from the dense relativistic wind of the magnetar. Another lower limit is obtained by requiring the dispersion measure contributed by the electron/positron pair wind to be consistent with the observations of the host galaxy. Furthermore, we also derive some upper limits on the magnetar age with discussions on possible energy sources of the FRB emission and the recently-discovered persistent radio counterpart. As a result, some constraints on model parameters are addressed by reconciling the lower limits with the possible upper limits that are derived with an assumption of rotational energy source.

5 pages, 1 figure, revised according to the referee's comments. Accepted for publication in ApJL

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• Finding the Particularity of the Active Episode of SGR J1935+2154 during Which FRB 20200428 Occurred: Implication from Statistics of Fermi/GBM X-Ray Bursts
• A search for short-term hard X-ray bursts in the direction of the repeating FRB 121102
• A dispersion excess from pulsar wind nebulae and supernova remnants: Implications for pulsars and FRBs
• Constraints on Pulsed Emission Model for Repeating FRB 121102
• Diverse origins for non-repeating fast radio bursts: Rotational radio transient sources and cosmological compact binary merger remnants
• Stimulated-emission based model of fast radio bursts
• A search for hard X-ray bursts occurring simultaneously to fast radio bursts in the repeating FRB 121102