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http://hdl.handle.net/20.500.12386/27768
Title: | Peculiar spin frequency and radio profile evolution of PSR J1119-6127 following magnetar-like X-ray bursts | Authors: | Dai, S. Johnston, S. Weltevrede, P. Kerr, M. BURGAY, MARTA Esposito, P. ISRAEL, Gian Luca POSSENTI, ANDREA Rea, N. Sarkissian, J. |
Issue Date: | 2018 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 480 | Issue: | 3 | First Page: | 3584 | 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<SUP>-4</SUP> Hz. During the transition, a net spin-down rate increase of ∆ \dot{ν }≈ -1× 10^{-10} Hz s<SUP>-1</SUP> 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. | URI: | http://hdl.handle.net/20.500.12386/27768 | URL: | https://academic.oup.com/mnras/article-abstract/480/3/3584/5063582 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/sty2063 | Bibcode ADS: | 2018MNRAS.480.3584D | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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