Lucy Oswald: Publications

Rapid Rotation of Polarization Orientations in PSR B1919+21’s Single Pulses: Implications on Pulsar’s Magnetospheric Dynamics

The Astrophysical Journal American Astronomical Society 983:1 (2025) 43-43

Authors:

Shunshun Cao, Jinchen Jiang, Jaroslaw Dyks, Kejia Lee, Jiguang Lu, Lucy S Oswald, Weiyang Wang, Renxin Xu

Abstract:

Abstract We analyze and model rapid rotations of polarization orientations in PSR B1919+21’s single pulses based on Five-hundred-meter Aperture Spherical radio Telescope observation data. In more than one-third of B1919+21’s single pulses, the polarization position angle (PA) is found to rotate quasi-monotonically with pulse longitude over 180° or even 360°. Some single pulse PA even rotates by over 540°. Most of these quasi-monotonic PA curves have negative slopes with respect to pulse longitude. Oscillations of circular polarization fraction accompany these PA rotations. This rapid rotation could be induced by a quick change of phase lag between two normal wave modes within an individual pulse. We propose a phenomenological model to reproduce the observed polarization rotations in single pulses, and calculate phase lags in a dipolar magnetic field of an aligned rotating pulsar, with a dispersion relation of orthogonal wave modes in strongly magnetized electron-positron plasma. According to the dispersion relation, the weak frequency dependence of observed polarization rotation requires small angles between the radio wavevector and local magnetic fields, which requires the radio emission height to be low, on the order of 10 times neutron star radius.

On the origin of radio polarization in pulsar polar caps

ArXiv 2503.17249 (2025)

Authors:

Jan Benáček, Axel Jessner, Martin Pohl, Tatiana Rievajová, Lucy S Oswald

The ubiquity of variable radio emission and spin-down rates in pulsars

Monthly Notices of the Royal Astronomical Society 91̽�� University Press (OUP) (2025) staf427

Authors:

ME Lower, A Karastergiou, S Johnston, PR Brook, S Dai, M Kerr, RN Manchester, LS Oswald, RM Shannon, C Sobey, P Weltevrede

The Thousand-Pulsar-Array programme on MeerKAT – XVII. Discovery of beating radio emission variability in PSR J1514−4834

Monthly Notices of the Royal Astronomical Society 91̽�� University Press (OUP) 538:2 (2025) 1063-1080

Authors:

JA Hsu, P Weltevrede, G Wright, MJ Keith, LS Oswald, X Song, H Wang

The ubiquity of variable radio emission and spin-down rates in pulsars

(2025)

Authors:

ME Lower, A Karastergiou, S Johnston, PR Brook, S Dai, M Kerr, RN Manchester, LS Oswald, RM Shannon, C Sobey, P Weltevrede

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Lucy Oswald

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Rapid Rotation of Polarization Orientations in PSR B1919+21’s Single Pulses: Implications on Pulsar’s Magnetospheric Dynamics

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Abstract:

On the origin of radio polarization in pulsar polar caps

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The ubiquity of variable radio emission and spin-down rates in pulsars

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The Thousand-Pulsar-Array programme on MeerKAT – XVII. Discovery of beating radio emission variability in PSR J1514−4834

Authors:

The ubiquity of variable radio emission and spin-down rates in pulsars

Authors:

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Lucy Oswald

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Rapid Rotation of Polarization Orientations in PSR B1919+21’s Single Pulses: Implications on Pulsar’s Magnetospheric Dynamics

Authors:

Abstract:

On the origin of radio polarization in pulsar polar caps

Authors:

The ubiquity of variable radio emission and spin-down rates in pulsars

Authors:

The Thousand-Pulsar-Array programme on MeerKAT – XVII. Discovery of beating radio emission variability in PSR J1514−4834

Authors:

The ubiquity of variable radio emission and spin-down rates in pulsars

Authors: