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Aris Karastergiou

Professor of Astrophysics and Fellow at St Edmund Hall

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • MeerKAT
  • Pulsars, transients and relativistic astrophysics
  • The Square Kilometre Array (SKA)
  • Gamma-ray astronomy
Aris.Karastergiou@physics.ox.ac.uk
Telephone: 01865 (2)73642
Denys Wilkinson Building, room 603C
  • About
  • Publications

The Thousand-Pulsar-Array programme on MeerKAT -- XII. Discovery of long-term pulse profile evolution in 7 young pulsars

(2024)

Authors:

A Basu, P Weltevrede, MJ Keith, S Johnston, A Karastergiou, LS Oswald, B Posselt, X Song, AD Cameron
More details from the publisher
Details from ArXiV

A MeerKAT view of the double pulsar eclipses

Astronomy & Astrophysics EDP Sciences 682 (2024) a26

Authors:

ME Lower, M Kramer, RM Shannon, RP Breton, N Wex, S Johnston, M Bailes, S Buchner, H Hu, V Venkatraman Krishnan, VA Blackmon, F Camilo, DJ Champion, PCC Freire, M Geyer, A Karastergiou, J van Leeuwen, MA McLaughlin, DJ Reardon, IH Stairs
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A MeerKAT view of the double pulsar eclipses -- Geodetic precession of pulsar B and system geometry

(2023)

Authors:

ME Lower, M Kramer, RM Shannon, RP Breton, N Wex, S Johnston, M Bailes, S Buchner, H Hu, V Venkatraman Krishnan, VA Blackmon, F Camilo, DJ Champion, PCC Freire, M Geyer, A Karastergiou, J van Leeuwen, MA McLaughlin, DJ Reardon, IH Stairs
More details from the publisher
Details from ArXiV

Pulsar polarization: a partial-coherence model

Monthly Notices of the Royal Astronomical Society Oxford University Press 525:1 (2023) 840-853

Authors:

Lucy S Oswald, Aris Karastergiou, Simon Johnston

Abstract:

The population of radio pulsars is observed to demonstrate certain polarization properties not explained by the conventional picture of pulsar polarization, namely frequency evolution of polarization, deviations of the linear polarization angle from a curve of geometric origins, and the presence of features in the circular polarization. We present the partial-coherence model as a way to explain the co-occurrence of these features and to provide an origin for circular polarization in radio pulsar profiles. We describe the mathematics of the model and demonstrate how it can explain these observed features, both on a population level and for the idiosyncrasies of individual pulsars. The partial coherence model can account for complex polarization behaviour, enabling improved access to information about pulsar geometries. We discuss the scientific implications of this for our understanding of pulsar radio emission and propagation.
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Rotational and radio emission properties of PSR J0738−4042 over half a century

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 524:4 (2023) 5904-5917

Authors:

ME Lower, S Johnston, A Karastergiou, PR Brook, M Bailes, S Buchner, AT Deller, L Dunn, C Flynn, M Kerr, RN Manchester, A Mandlik, LS Oswald, A Parthasarathy, RM Shannon, C Sobey, P Weltevrede
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