Peculiar spin frequency and radio profile evolution of PSR J1119-6127 following magnetar-like X-ray bursts
Date Issued
2018
Author(s)
Dai, S.
•
Johnston, S.
•
Weltevrede, P.
•
Kerr, M.
•
•
Esposito, P.
•
•
•
Rea, N.
•
Sarkissian, J.
Abstract
We present the spin frequency and profile evolution of the radio pulsar J1119 - 6127 following magnetar-like X-ray bursts from the system in 2016 July. Using data from the Parkes radio telescope, we observe a smooth and fast spin-down process subsequent to the X-ray bursts resulting in a net change in the pulsar rotational frequency of ∆ν ≈ -4 × 10-4 Hz. During the transition, a net spin-down rate increase of ∆ \dot{ν }≈ -1× 10^{-10} Hz s-1 is observed, followed by a return of \dot{ν } to its original value. In addition, the radio pulsations disappeared after the X-ray bursts and reappeared about two weeks later with the flux density at 1.4 GHz increased by a factor of 5. The flux density then decreased and undershot the normal flux density followed by a slow recovery back to normal. The pulsar's integrated profile underwent dramatic and short-term changes in total intensity, polarization, and position angle. Despite the complex evolution, we observe correlations between the spin-down rate, pulse profile shape, and radio flux density. Strong single pulses have been detected after the X-ray bursts with their energy distributions evolving with time. The peculiar but smooth spin frequency evolution of PSR J1119-6127 accompanied by systematic pulse profile and flux density changes are most likely to be a result of either reconfiguration of the surface magnetic fields or particle winds triggered by the X-ray bursts. The recovery of spin-down rate and pulse profile to normal provides us the best case to study the connection between high magnetic-field pulsars and magnetars.
Volume
480
Issue
3
Start page
3584
Issn Identifier
0035-8711
Ads BibCode
2018MNRAS.480.3584D
Rights
open.access
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