Gamma-ray astronomy

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An extremely powerful long-lived superluminal ejection from the black hole MAXI J1820+070

(2020)

Authors:

JS Bright, RP Fender, SE Motta, DRA Williams, J Moldon, RM Plotkin, JCA Miller-Jones, I Heywood, E Tremou, R Beswick, GR Sivakoff, S Corbel, DAH Buckley, J Homan, E Gallo, AJ Tetarenko, TD Russell, DA Green, D Titterington, PA Woudt, RP Armstrong, PJ Groot, A Horesh, AJ van der Horst, EG Körding, VA McBride, A Rowlinson, RAMJ Wijers

A spectroscopic, photometric, polarimetric, and radio study of the eclipsing polar UZ Fornacis: the first simultaneous SALT and MeerKAT observations

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 492:3 (2020) 4298-4312

Authors:

ZN Khangale, SB Potter, PA Woudt, DAH Buckley, AN Semena, EJ Kotze, DN Groenewald, DM Hewitt, ML Pretorius, RP Fender, P Groot, S Bloemen, M Klein-Wolt, E Körding, R Le Poole, VA McBride, L Townsend, K Paterson, DLA Pieterse, P Vreeswijk

Detection of very-high-energy γ-ray emission from the colliding wind binary η Car with H.E.S.S.

Astronomy & Astrophysics EDP Sciences 635 (2020) a167

Authors:

H Abdalla, R Adam, F Aharonian, F Ait Benkhali, EO Angüner, M Arakawa, C Arcaro, C Armand, T Armstrong, H Ashkar, M Backes, V Barbosa Martins, M Barnard, Y Becherini, D Berge, K Bernlöhr, R Blackwell, M Böttcher, C Boisson, J Bolmont, S Bonnefoy, J Bregeon, M Breuhaus, F Brun, P Brun, M Bryan, M Büchele, T Bulik, T Bylund, S Caroff, A Carosi, S Casanova, M Cerruti, T Chand, S Chandra, A Chen, S Colafrancesco, G Cotter, M Curyło, ID Davids, J Davies, C Deil, J Devin, P deWilt, L Dirson, A Djannati-Ataï, A Dmytriiev, A Donath, V Doroshenko, J Dyks, K Egberts, F Eichhorn, G Emery, J-P Ernenwein, S Eschbach, K Feijen, S Fegan, A Fiasson, G Fontaine, S Funk, M Füßling, S Gabici, YA Gallant, F Gaté, G Giavitto, L Giunti, D Glawion, JF Glicenstein, D Gottschall, M-H Grondin, J Hahn, M Haupt, G Heinzelmann, G Henri, G Hermann, JA Hinton, W Hofmann, C Hoischen, TL Holch, M Holler, M Hörbe, D Horns, D Huber, H Iwasaki, M Jamrozy, D Jankowsky, F Jankowsky, A Jardin-Blicq, V Joshi, I Jung-Richardt, MA Kastendieck, K Katarzyński, M Katsuragawa, U Katz, D Khangulyan, B Khélifi, J King, S Klepser, W Kluźniak, Nu Komin, K Kosack, D Kostunin, M Kreter, G Lamanna, A Lemière, M Lemoine-Goumard, J-P Lenain, E Leser, C Levy, T Lohse, I Lypova, J Mackey, J Majumdar, D Malyshev, D Malyshev, V Marandon, P Marchegiani, A Marcowith, A Mares, G Martí-Devesa, R Marx, G Maurin, PJ Meintjes, R Moderski, M Mohamed, L Mohrmann, C Moore, P Morris, E Moulin, J Muller, T Murach, S Nakashima, K Nakashima, M de Naurois, H Ndiyavala, F Niederwanger, J Niemiec, L Oakes, P O’Brien, H Odaka, S Ohm, E de Ona Wilhelmi, M Ostrowski, M Panter, RD Parsons, C Perennes, P-O Petrucci, B Peyaud, Q Piel, S Pita, V Poireau, A Priyana Noel, DA Prokhorov, H Prokoph, G Pühlhofer, M Punch, A Quirrenbach, S Raab, R Rauth, A Reimer, O Reimer, Q Remy, M Renaud, F Rieger, L Rinchiuso, C Romoli, G Rowell, B Rudak, E Ruiz-Velasco, V Sahakian, S Sailer, S Saito, DA Sanchez, A Santangelo, M Sasaki, M Scalici, R Schlickeiser, F Schüssler, A Schulz, HM Schutte, U Schwanke, S Schwemmer, M Seglar-Arroyo, M Senniappan, AS Seyffert, N Shafi, K Shiningayamwe, R Simoni, A Sinha, H Sol, A Specovius, S Spencer, M Spir-Jacob, Ł Stawarz, R Steenkamp, C Stegmann, C Steppa, T Takahashi, T Tavernier, AM Taylor, R Terrier, D Tiziani, M Tluczykont, L Tomankova, C Trichard, M Tsirou, N Tsuji, R Tuffs, Y Uchiyama, DJ van der Walt, C van Eldik, C van Rensburg, B van Soelen, G Vasileiadis, J Veh, C Venter, P Vincent, J Vink, HJ Völk, T Vuillaume, Z Wadiasingh, SJ Wagner, J Watson, F Werner, R White, A Wierzcholska, R Yang, H Yoneda, M Zacharias, R Zanin, AA Zdziarski, A Zech, J Zorn, N Żywucka

Radio and X-ray detections of GX 339-4 in quiescence using MeerKAT and Swift

Monthly Notices of the Royal Astronomical Society: Letters Oxford University Press 493:1 (2020) L132-L137

Authors:

E Tremou, S Corbel, Rp Fender, Pa Woudt, Jca Miller-Jones, Sara Motta, I Heywood, Robert Armstrong, P Groot, A Horesh, Aj Van Der Horst, E Koerding, Kunal Mooley, A Rowlinson, Ramj Wijers

Abstract:

The radio-X-ray correlation that characterizes accreting black holes at all mass scales - from stellar mass black holes in binary systems to supermassive black holes powering active galactic nuclei - is one of the most important pieces of observational evidence supporting the existence of a connection between the accretion process and the generation of collimated outflows - or jets - in accreting systems. Although recent studies suggest that the correlation extends down to low luminosities, only a handful of stellar mass black holes have been clearly detected, and in general only upper limits (especially at radio wavelengths) can be obtained during quiescence. We recently obtained detections of the black hole X-ray binary (XRB) GX 339-4 in quiescence using the Meer Karoo Array Telescope (MeerKAT) radio telescope and Swift X-ray Telescope instrument on board the Neil Gehrels Swift Observatory, probing the lower end of the radio-X-ray correlation. We present the properties of accretion and of the connected generation of jets in the poorly studied low-accretion rate regime for this canonical black hole XRB system.

Radio & X-ray detections of GX 339--4 in quiescence using MeerKAT and Swift

(2020)

Authors:

E Tremou, S Corbel, RP Fender, PA Woudt, JCA Miller-Jones, SE Motta, I Heywood, RP Armstrong, P Groot, A Horesh, AJ van der Horst, E Koerding, KP Mooley, A Rowlinson, RAMJ Wijers