Pulsars, transients and relativistic astrophysics

Research group

Research theme

Sub department

About

Serendipitous discovery of radio flaring behaviour from a nearby M dwarf with MeerKAT

(2022)

Authors:

Alex Andersson, Rob Fender, Chris Lintott, David Williams, Laura Driessen, Patrick Woudt, Alexander van der Horst, David Buckley, Sara Motta, Lauren Rhodes, Nora Eisner, Rachel Osten, Paul Vreeswijk, Steven Bloemen, Paul Groot

Long term radio monitoring of the neutron star X-ray binary Swift J1858.6-0814

(2022)

Authors:

L Rhodes, RP Fender, SE Motta, J van den Eijnden, DRA Williams, JS Bright, GR Sivakoff

Changes in the Nature of the Spectral Continuum and Stability of the Cyclotron Line in the X-ray Pulsar GRO J2058+42

Astronomy Letters 48:4 (2022) 256-266

Authors:

AS Gorban, SV Molkov, SS Tsygankov, AA Mushtukov, AA Lutovinov

Abstract:

Abstract: We present the results of our study of the transient X-ray pulsar GRO J2058+42 in a wide energy range in a state with a luminosity (Formula presented.). We have found that the pulse profile of the source, along with the pulse fraction, changed significantly in comparison with the previous NuSTAR observations performed when the pulsar was brighter approximately by a factor of 10. The position of the cyclotron line at (Formula presented.) keV in a narrow phase interval is consistent with the observations in the high state. Spectral analysis has shown that at high luminosities (Formula presented.) erg s-1 the spectrum has a shape typical of accreting pulsars, whereas a two-component model should be used to describe the spectrum when the luminosity drops approximately by an order of magnitude, to (Formula presented.) erg s-1. This behavior fits into the model in which the low-energy part of the spectrum is formed in a hot spot, while the high-energy one is formed as a result of resonant Compton scattering by the infalling matter in the accretion channel above the neutron star surface.

Time-resolved hadronic particle acceleration in the recurrent nova RS Ophiuchi

Science American Association for the Advancement of Science (AAAS) 376:6588 (2022) 77-80

Authors:

F Aharonian, F Ait Benkhali, EO Angüner, H Ashkar, M Backes, V Baghmanyan, V Barbosa Martins, R Batzofin, Y Becherini, D Berge, K Bernlöhr, B Bi, M Böttcher, C Boisson, J Bolmont, M de Bony de Lavergne, M Breuhaus, R Brose, F Brun, S Caroff, S Casanova, M Cerruti, T Chand, A Chen, G Cotter, J Damascene Mbarubucyeye, A Djannati-Ataï, A Dmytriiev, V Doroshenko, C Duffy, K Egberts, J-P Ernenwein, S Fegan, K Feijen, A Fiasson, G Fichet de Clairfontaine, G Fontaine, M Füßling, S Funk, S Gabici, YA Gallant, S Ghafourizadeh, G Giavitto, L Giunti, D Glawion, JF Glicenstein, M-H Grondin, G Hermann, JA Hinton, M Hörbe, W Hofmann, C Hoischen, TL Holch, M Holler, D Horns, Zhiqiu Huang, M Jamrozy, F Jankowsky, I Jung-Richardt, E Kasai, K Katarzyński, U Katz, D Khangulyan, B Khélifi, S Klepser, W Kluźniak, Nu Komin, R Konno, K Kosack, D Kostunin, S Le Stum, A Lemière, M Lemoine-Goumard, J-P Lenain, F Leuschner, T Lohse, A Luashvili, I Lypova, J Mackey, D Malyshev, D Malyshev, V Marandon, P Marchegiani, A Marcowith, G Martí-Devesa, R Marx, G Maurin, M Meyer, A Mitchell, R Moderski, L Mohrmann, A Montanari, E Moulin, J Muller, T Murach, K Nakashima, M de Naurois, A Nayerhoda, J Niemiec, A Priyana Noel, P O'Brien, S Ohm, L Olivera-Nieto, E de Ona Wilhelmi, M Ostrowski, S Panny, M Panter, RD Parsons, G Peron, S Pita, V Poireau, DA Prokhorov, H Prokoph, G Pühlhofer, M Punch, A Quirrenbach, P Reichherzer, A Reimer, O Reimer, M Renaud, B Reville, F Rieger, G Rowell, B Rudak, H Rueda Ricarte, E Ruiz-Velasco, V Sahakian, S Sailer, H Salzmann, DA Sanchez, A Santangelo, M Sasaki, J Schäfer, F Schüssler, HM Schutte, U Schwanke, M Senniappan, JNS Shapopi, R Simoni, A Sinha, H Sol, A Specovius, S Spencer, Ł Stawarz, S Steinmassl, C Steppa, T Takahashi, T Tanaka, AM Taylor, R Terrier, C Thorpe-Morgan, M Tsirou, N Tsuji, R Tuffs, Y Uchiyama, T Unbehaun, C van Eldik, B van Soelen, J Veh, C Venter, J Vink, SJ Wagner, F Werner, R White, A Wierzcholska, Yu Wun Wong, A Yusafzai, M Zacharias, D Zargaryan, AA Zdziarski, A Zech, SJ Zhu, S Zouari, N Żywucka

Search and identification of transient and variable radio sources using MeerKAT observations: a case study on the MAXI J1820+070 field

(2022)

Authors:

A Rowlinson, J Meijn, J Bright, AJ van der Horst, S Chastain, S Fijma, R Fender, I Heywood, RAMJ Wijers, PA Woudt, A Andersson, GR Sivakoff, E Tremou, LN Driessen