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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 – X. Scintillation arcs of 107 pulsars

Monthly Notices of the Royal Astronomical Society Oxford University Press 518:1 (2022) 1086-1097

Authors:

Ra Main, A Parthasarathy, S Johnston, A Karastergiou, A Basu, Ad Cameron, Mj Keith, Lucy Oswald, B Posselt, Dj Reardon, X Song, P Weltevrede

Abstract:

We present the detection of 107 pulsars with interstellar scintillation arcs at 856–1712 MHz, observed with the MeerKAT Thousand Pulsar Array Programme. Scintillation arcs appear to be ubiquitous in clean, high S/N observations, their detection mainly limited by short observing durations and coarse frequency channel resolution. This led the survey to be sensitive to nearby, lightly scattered pulsars with high effective velocity – from a large proper motion, a screen nearby the pulsar, or a screen near the Earth. We measure the arc curvatures in all of our sources, which can be used to give an estimate of screen distances in pulsars with known proper motion, or an estimate of the proper motion. The short scintillation time-scale in J1731−4744 implies a scattering screen within 12 pc of the source, strongly suggesting the association between this pulsar and the supernova remnant RCW 114. We measure multiple parabolic arcs of five pulsars, all of which are weakly scintillating with high proper motion. Additionally, several sources show hints of inverted arclets suggesting scattering from anisotropic screens. Building on this work, further targeted MeerKAT observations of many of these pulsars will improve understanding of our local scattering environment and the origins of scintillation; annual scintillation curves would lead to robust screen distance measurements, and the evolution of arclets in time and frequency can constrain models of scintillation.
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The eccentric millisecond pulsar, PSR J0955−6150

Astronomy & Astrophysics EDP Sciences 665 (2022) a53

Authors:

M Serylak, V Venkatraman Krishnan, PCC Freire, TM Tauris, M Kramer, M Geyer, A Parthasarathy, M Bailes, MCI Bernadich, S Buchner, M Burgay, F Camilo, A Karastergiou, ME Lower, A Possenti, DJ Reardon, RM Shannon, R Spiewak, IH Stairs, W van Straten
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High-Performance Computing for SKA Transient Search: Use of FPGA based Accelerators -- a brief review

(2022)

Authors:

R Aafreen, R Abhishek, B Ajithkumar, Arunkumar M Vaidyanathan, Indrajit V Barve, Sahana Bhattramakki, Shashank Bhat, BS Girish, Atul Ghalame, Y Gupta, Harshal G Hayatnagarkar, PA Kamini, A Karastergiou, L Levin, S Madhavi, M Mekhala, M Mickaliger, V Mugundhan, Arun Naidu, J Oppermann, B Arul Pandian, N Patra, A Raghunathan, Jayanta Roy, Shiv Sethi, Benjamin Shaw, K Sherwin, O Sinnen, SK Sinha, KS Srivani, B Stappers, CR Subrahmanya, Thiagaraj Prabu, C Vinutha, YG Wadadekar, Haomiao Wang, C Williams
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Long-term rotational and emission variability of 17 radio pulsars

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 513:4 (2022) 5861-5880

Authors:

B Shaw, BW Stappers, P Weltevrede, PR Brook, A Karastergiou, CA Jordan, MJ Keith, M Kramer, AG Lyne
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Searching for pulsars associated with polarised point sources using LOFAR: Initial discoveries from the TULIPP project

Astronomy & Astrophysics EDP Sciences 661 (2022) a87

Authors:

C Sobey, CG Bassa, SP O’Sullivan, JR Callingham, CM Tan, JWT Hessels, VI Kondratiev, BW Stappers, C Tiburzi, G Heald, T Shimwell, RP Breton, M Kirwan, HK Vedantham, E Carretti, J-M Grießmeier, M Haverkorn, A Karastergiou
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