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sky and dish

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

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
More details from the publisher

Long-term rotational and emission variability of 17 radio pulsars

(2022)

Authors:

B Shaw, BW Stappers, P Weltevrede, PR Brook, A Karastergiou, CA Jordan, MJ Keith, M Kramer, AG Lyne
More details from the publisher
Details from ArXiV

The MeerTime Pulsar Timing Array -- A Census of Emission Properties and Timing Potential

(2022)

Authors:

R Spiewak, M Bailes, MT Miles, A Parthasarathy, DJ Reardon, M Shamohammadi, RM Shannon, NDR Bhat, S Buchner, AD Cameron, F Camilo, M Geyer, S Johnston, A Karastergiou, M Keith, M Kramer, M Serylak, W van Straten, G Theureau, V Venkatraman Krishnan
More details from the publisher
Details from ArXiV

Active Galactic Nuclei population studies with the Cherenkov Telescope Array

Proceedings of Science 395 (2022)

Authors:

H Abdalla, H Abe, S Abe, A Abusleme, F Acero, A Acharyya, V Acín Portella, K Ackley, R Adam, C Adams, SS Adhikari, I Aguado-Ruesga, I Agudo, R Aguilera, A Aguirre-Santaella, F Aharonian, A Alberdi, R Alfaro, J Alfaro, C Alispach, R Aloisio, R Alves Batista, JP Amans, L Amati, E Amato, L Ambrogi, G Ambrosi, M Ambrosio, R Ammendola, J Anderson, M Anduze, EO Angüner, LA Antonelli, V Antonuccio, P Antoranz, R Anutarawiramkul, J Aragunde Gutierrez, C Aramo, A Araudo, M Araya, A Arbet-Engels, C Arcaro, V Arendt, C Armand, T Armstrong, F Arqueros, L Arrabito, B Arsioli, M Artero, K Asano, Y Ascasíbar, J Aschersleben, M Ashley, P Attinà, P Aubert, CB Singh, D Baack, A Babic, M Backes, V Baena, S Bajtlik, A Baktash, C Balazs, M Balbo, O Ballester, J Ballet, B Balmaverde, A Bamba, R Bandiera, A Baquero Larriva, P Barai, C Barbier, V Barbosa Martins, M Barcelo, M Barkov, M Barnard, L Baroncelli, U Barres de Almeida, JA Barrio, D Bastieri, PI Batista, I Batkovic, C Bauer, R Bautista-González, J Baxter, U Becciani, J Becerra González, Y Becherini, G Beck, J Becker Tjus, W Bednarek, A Belfiore, L Bellizzi, R Belmont, W Benbow, D Berge, E Bernardini, MI Bernardos, K Bernlöhr, A Berti

Abstract:

The Cherenkov Telescope Array (CTA) observatory is the next generation of ground-based imaging atmospheric Cherenkov telescopes (IACTs). Building on the strengths of current IACTs, CTA is designed to achieve an order of magnitude improvement in sensitivity, with unprecedented angular and energy resolution. CTA will also increase the energy reach of IACTs, observing photons in the energy range from 20 GeV to beyond 100 TeV. These advances in performance will see CTA heralding in a new era for high-energy astrophysics, with the emphasis shifting from source discovery, to population studies and precision measurements. In this talk we discuss CTA’s ability to conduct source population studies of γ-ray bright active galactic nuclei and how this ability will enhance our understanding on the redshift evolution of this dominant γ-ray source class.

Detection methods for the Cherenkov Telescope Array at very-short exposure times

Proceedings of Science 395 (2022)

Authors:

A Di Piano, A Bulgarelli, V Fioretti, L Baroncelli, N Parmiggiani, F Longo, A Stamerra, A López-Oramas, G Stratta, G De Cesare, H Abdalla, H Abe, S Abe, A Abusleme, F Acero, A Acharyya, V Acín Portella, K Ackley, R Adam, C Adams, SS Adhikari, I Aguado-Ruesga, I Agudo, R Aguilera, A Aguirre-Santaella, F Aharonian, A Alberdi, R Alfaro, J Alfaro, C Alispach, R Aloisio, R Alves Batista, JP Amans, L Amati, E Amato, L Ambrogi, G Ambrosi, M Ambrosio, R Ammendola, J Anderson, M Anduze, EO Angüner, LA Antonelli, V Antonuccio, P Antoranz, R Anutarawiramkul, J Aragunde Gutierrez, C Aramo, A Araudo, M Araya, A Arbet-Engels, C Arcaro, V Arendt, C Armand, T Armstrong, F Arqueros, L Arrabito, B Arsioli, M Artero, K Asano, Y Ascasíbar, J Aschersleben, M Ashley, P Attinà, P Aubert, CB Singh, D Baack, A Babic, M Backes, V Baena, S Bajtlik, A Baktash, C Balazs, M Balbo, O Ballester, J Ballet, B Balmaverde, A Bamba, R Bandiera, A Baquero Larriva, P Barai, C Barbier, V Barbosa Martins, M Barcelo, M Barkov, M Barnard, U Barres de Almeida, JA Barrio, D Bastieri, PI Batista, I Batkovic, C Bauer, R Bautista-González, J Baxter, U Becciani, J Becerra González, Y Becherini, G Beck, J Becker Tjus, W Bednarek

Abstract:

The Cherenkov Telescope Array (CTA) will be the next generation ground-based observatory for very-high-energy (VHE) gamma-ray astronomy, with the deployment of tens of highly sensitive and fast-reacting Cherenkov telescopes. It will cover a wide energy range (20 GeV - 300 TeV) with unprecedented sensitivity. To maximize the scientific return, the observatory will be provided with an online software system that will perform the first analysis of scientific data in real-time. This study investigates the precision and accuracy of available science tools and analysis techniques for the short-term detection of gamma-ray sources, in terms of sky localization, detection significance and, if significant detection is achieved, a first estimation of the integral photon flux. The scope is to evaluate the feasibility of the algorithms' implementation in the real-time analysis of CTA. In this contribution we present a general overview of the methods and some of the results for the test case of the short-term detection of a gamma-ray burst afterglow, as the VHE counterpart of a gravitational wave event.

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