Understanding the radio beam of PSR J1136+1551 through its single pulses
Monthly Notices of the Royal Astronomical Society Oxford University Press 489:1 (2019) 310-324
Abstract:
The frequency widening of pulsar profiles is commonly attributed to lower frequencies being produced at greater heights above the surface of the pulsar; so-called radius-to-frequency mapping (RFM). The observer’s view of pulsar emission is a 1D cut through a 3D magnetosphere: we can only see that emission which points along our line of sight. However, by comparing the frequency evolution of many single pulses positioned at different phases, we can build up an understanding of the shape of the active emission region. We use single pulses observed with the Giant Metrewave Radio Telescope to investigate the emission region of PSR J1136+1551 and test RFM. Assuming that emission is produced tangential to the magnetic field lines and that each emission frequency corresponds to a single height, we simulate the single pulse profile evolution resulting from the canonical conal beam model and a fan beam model. Comparing the results of these simulations with the observations, we conclude that the emission region of PSR J1136+1551 is better described by the fan beam model. The diversity of profile widening behaviour observed for the single pulses can be explained by orthogonally polarized modes propagating along differing frequency-dependent paths in the magnetosphere.A fast radio burst with frequency-dependent polarization detected during Breakthrough Listen observations
Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 486:3 (2019) 3636-3646
The LOFAR Tied-Array All-Sky Survey (LOTAAS): Survey overview and initial pulsar discoveries
Astronomy & Astrophysics EDP Sciences 626 (2019) a104
The period–width relationship for radio pulsars revisited
Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 485:1 (2019) 640-647
Low-frequency Faraday rotation measures towards pulsars using LOFAR: probing the 3D Galactic halo magnetic field
Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 484:3 (2019) 3646-3664