Single-pulse and profile-variability study of PSR J1022+1001 - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2015

Single-pulse and profile-variability study of PSR J1022+1001

Résumé

Millisecond pulsars (MSPs) are known as highly stable celestial clocks. Nevertheless, recent studies have revealed the unstable nature of their integrated pulse profiles, which may limit the achievable pulsar timing precision. In this article, we present a case study on the pulse-profile variability of PSR J1022+1001. We have detected approximately 14 000 subpulses (components of single pulses) in 35-h long observations, mostly located in the trailing component of the integrated profile. Their flux densities and fractional polarization suggest that they represent the bright end of the energy distribution in ordinary emission mode and are not giant pulses. The occurrence of subpulses in the leading and trailing components of the integrated profile is shown to be correlated. For subpulses from the latter, a preferred pulse width of approximately 0.25 ms has been found. Using simultaneous observations from the Effelsberg 100-m telescope and the Westerbork Synthesis Radio Telescope, we have found that the integrated profile varies on a time-scale of a few tens of minutes. We show that improper polarization calibration and diffractive scintillation cannot be the sole reason for the observed instability. In addition, we demonstrate that timing residuals generated from averages of the detected subpulses are dominated by phase jitter and we place an upper limit of similar to 700 ns on jitter noise, based on continuous 1-min integrations.
Fichier principal
Vignette du fichier
MNRAS-2015-Liu-1158-69.pdf (1.53 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

insu-01182202 , version 1 (09-06-2016)

Identifiants

Citer

Kuo Liu, R. Karuppusamy, K. J. Lee, B. W. Stappers, M. Kramer, et al.. Single-pulse and profile-variability study of PSR J1022+1001. Monthly Notices of the Royal Astronomical Society, 2015, 449 (1), pp.1158-1169. ⟨10.1093/mnras/stv397⟩. ⟨insu-01182202⟩
128 Consultations
132 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More