Gamma-ray astronomy

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Hard-state accretion disk winds from black holes: the revealing case of MAXI J1820+070

(2019)

Authors:

T Mu帽oz-Darias, F Jim茅nez-Ibarra, G Panizo-Espinar, J Casares, D Mata S谩nchez, G Ponti, RP Fender, DAH Buckley, P Garnavich, MAP Torres, M Armas Padilla, PA Charles, JM Corral-Santana, JJE Kajava, EJ Kotze, C Littlefield, J S谩nchez-Sierras, D Steeghs, J Thomas

ALMA observations of A0620-00: fresh clues on the nature of quiescent black hole X-ray binary jets

(2019)

Authors:

Elena Gallo, Richard Teague, Richard M Plotkin, James CA Miller-Jones, David M Russell, Tolga Din莽er, Charles Bailyn, Thomas J Maccarone, Sera Markoff, Rob P Fender

Disk-jet coupling in the 2017/2018 outburst of the Galactic black hole candidate X-ray binary MAXI J1535-571

(2019)

Authors:

TD Russell, AJ Tetarenko, JCA Miller-Jones, GR Sivakoff, AS Parikh, S Rapisarda, R Wijnands, S Corbel, E Tremou, D Altamirano, MC Baglio, C Ceccobello, N Degenaar, J van den Eijnden, R Fender, I Heywood, HA Krimm, M Lucchini, S Markoff, DM Russell, R Soria, PA Woudt

The LOFAR Tied-Array All-Sky Survey (LOTAAS): Survey overview and initial pulsar discoveries

Astronomy & Astrophysics EDP Sciences 626 (2019) a104

Authors:

S Sanidas, S Cooper, CG Bassa, JWT Hessels, VI Kondratiev, D Michilli, BW Stappers, CM Tan, J van Leeuwen, L Cerrigone, RA Fallows, M Iacobelli, E Orr煤, RF Pizzo, A Shulevski, MC Toribio, S ter Veen, P Zucca, L Bondonneau, J-M Grie脽meier, A Karastergiou, M Kramer, C Sobey

Cosmic ray acceleration to ultrahigh energy in radio galaxies

EPJ Web of Conferences EDP Sciences (2019)

Authors:

James H Matthews, Anthony R Bell, Anabella T Araudo, Katherine M Blundell

Abstract:

The origin of ultrahigh energy cosmic rays (UHECRs) is an open question. In this proceeding, we first review the general physical requirements that a source must meet for acceleration to 10-100 EeV, including the consideration that the shock is not highly relativistic. We show that shocks in the backflows of radio galaxies can meet these requirements. We discuss a model in which giant-lobed radio galaxies such as Centaurus A and Fornax A act as slowly-leaking UHECR reservoirs, with the UHECRs being accelerated during a more powerful past episode. We also show that Centaurus A, Fornax A and other radio galaxies may explain the observed anisotropies in data from the Pierre Auger Observatory, before examining some of the difficulties in associating UHECR anisotropies with astrophysical sources.