Pulsars, transients and relativistic astrophysics

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

Nature Astronomy Nature Research 4:7 (2020) 697-703

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 Kording, VA McBride, A Rowlinson, RAMJ Wijers

Abstract:

Black holes in binary systems execute patterns of outburst activity where two characteristic X-ray states are associated with different behaviours observed at radio wavelengths. The hard state is associated with radio emission indicative of a continuously replenished, collimated, relativistic jet, whereas the soft state is rarely associated with radio emission, and never continuously, implying the absence of a quasi-steady jet. Here we report radio observations of the black hole transient MAXI J1820+070 during its 2018 outburst. As the black hole transitioned from the hard to soft state, we observed an isolated radio flare, which, using high-angular-resolution radio observations, we connect with the launch of bipolar relativistic ejecta. This flare occurs as the radio emission of the core jet is suppressed by a factor of over 800. We monitor the evolution of the ejecta over 200 days and to a maximum separation of 10″, during which period it remains detectable due to in situ particle acceleration. Using simultaneous radio observations sensitive to different angular scales, we calculate an accurate estimate of energy content of the approaching ejection. This energy estimate is far larger than that derived from the state transition radio flare, suggesting a systematic underestimate of jet energetics.
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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
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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
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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
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MAGIC very large zenith angle observations of the Crab Nebula up to 100 TeV

Astronomy & Astrophysics EDP Sciences 635 (2020) a158

Authors:

VA Acciari, S Ansoldi, LA Antonelli, A Arbet Engels, D Baack, A Babić, B Banerjee, U Barres de Almeida, JA Barrio, J Becerra González, W Bednarek, L Bellizzi, E Bernardini, A Berti, J Besenrieder, W Bhattacharyya, C Bigongiari, A Biland, O Blanch, G Bonnoli, Ž Bošnjak, G Busetto, R Carosi, G Ceribella, Y Chai, A Chilingaryan, S Cikota, SM Colak, U Colin, E Colombo, JL Contreras, J Cortina, S Covino, V D’Elia, P Da Vela, F Dazzi, A De Angelis, B De Lotto, M Delfino, J Delgado, D Depaoli, F Di Pierro, L Di Venere, E Do Souto Espiñeira, D Dominis Prester, A Donini, D Dorner, M Doro, D Elsaesser, V Fallah Ramazani, A Fattorini, G Ferrara, D Fidalgo, L Foffano, MV Fonseca, L Font, C Fruck, S Fukami, RJ García López, M Garczarczyk, S Gasparyan, M Gaug, N Giglietto, F Giordano, N Godinović, D Green, D Guberman, D Hadasch, A Hahn, J Herrera, J Hoang, D Hrupec, M Hütten, T Inada, S Inoue, K Ishio, Y Iwamura, L Jouvin, D Kerszberg, H Kubo, J Kushida, A Lamastra, D Lelas, F Leone, E Lindfors, S Lombardi, F Longo, M López, R López-Coto, A López-Oramas, S Loporchio, B Machado de Oliveira Fraga, C Maggio, P Majumdar, M Makariev, M Mallamaci, G Maneva, M Manganaro, K Mannheim, L Maraschi, M Mariotti, M Martínez, D Mazin, S Mićanović, D Miceli, M Minev, JM Miranda, R Mirzoyan, E Molina, A Moralejo, D Morcuende, V Moreno, E Moretti, P Munar-Adrover, V Neustroev, C Nigro, K Nilsson, D Ninci, K Nishijima, K Noda, L Nogués, S Nozaki, S Paiano, J Palacio, M Palatiello, D Paneque, R Paoletti, JM Paredes, P Peñil, M Peresano, M Persic, PG Prada Moroni, E Prandini, I Puljak, W Rhode, M Ribó, J Rico, C Righi, A Rugliancich, L Saha, N Sahakyan, T Saito, S Sakurai, K Satalecka, K Schmidt, T Schweizer, J Sitarek, I Šnidarić, D Sobczynska, A Somero, A Stamerra, D Strom, M Strzys, Y Suda, T Surić, M Takahashi, F Tavecchio, P Temnikov, T Terzić, M Teshima, N Torres-Albà, L Tosti, V Vagelli, J van Scherpenberg, G Vanzo, M Vazquez Acosta, CF Vigorito, V Vitale, I Vovk, M Will, D Zarić
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