Pulsars, transients and relativistic astrophysics

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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 Orrú, RF Pizzo, A Shulevski, MC Toribio, S ter Veen, P Zucca, L Bondonneau, J-M Grießmeier, A Karastergiou, M Kramer, C Sobey
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A systematic study of the phase difference between QPO harmonics in black hole X-ray binaries

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 485:3 (2019) 3834-3844

Authors:

Iris de Ruiter, Jakob van den Eijnden, Adam Ingram, Phil Uttley
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Tidal disruption events onto stellar black holes in triples

(2019)

Authors:

Giacomo Fragione, Nathan Leigh, Rosalba Perna, Bence Kocsis
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Vela X-1 as a laboratory for accretion in High-Mass X-ray Binaries

ArXiv 1905.08578 (2019)

Authors:

P Kretschmar, S Martínez-Núñez, F Fürst, V Grinberg, M Lomaeva, I El Mellah, A Manousakis, AAC Sander, N Degenaar, J van den Eijnden
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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.
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