Gamma-ray astronomy

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The Arcminute Microkelvin Imager Catalogue of Gamma-ray Burst afterglows at 15.7 GHz

(2017)

Authors:

GE Anderson, TD Staley, AJ van der Horst, RP Fender, A Rowlinson, KP Mooley, JW Broderick, RAMJ Wijers, C Rumsey, DJ Titterington
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Up and Down the Black Hole Radio/X-ray Correlation: the 2017 mini-outbursts from Swift J1753.5-0127

(2017)

Authors:

RM Plotkin, J Bright, JCA Miller-Jones, AW Shaw, JA Tomsick, TD Russell, G-B Zhang, DM Russell, RP Fender, J Homan, P Atri, F Bernardini, JD Gelfand, F Lewis, TM Cantwell, SH Carey, KJB Grainge, J Hickish, YC Perrott, N Razavi-Ghods, AMM Scaife, PF Scott, DJ Titterington
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Paving the way to simultaneous multi-wavelength astronomy

(2017)

Authors:

MJ Middleton, P Casella, P Gandhi, E Bozzo, G Anderson, N Degenaar, I Donnarumma, G Israel, C Knigge, A Lohfink, S Markoff, T Marsh, N Rea, S Tingay, K Wiersema, D Altamirano, D Bhattacharya, WN Brandt, S Carey, P Charles, M Diaz Trigo, C Done, M Kotze, S Eikenberry, R Fender, P Ferruit, F Fuerst, J Greiner, A Ingram, L Heil, P Jonker, S Komossa, B Leibundgut, T Maccarone, J Malzac, V McBride, J Miller-Jones, M Page, EM Rossi, DM Russell, T Shahbaz, GR Sivakoff, M Tanaka, DJ Thompson, M Uemura, P Uttley, G van Moorsel, M Van Doesburgh, B Warner, B Wilkes, J Wilms, P Woudt
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Electromagnetic cascades as probes of cosmic magnetism

Il Nuovo Cimento C Società Italiana di Fisica 40:3 (2017) 132

Abstract:

The existence of intergalactic magnetic fields (IGMFs) is an open problem in cosmology and has never been unambiguously confirmed. High-energy gamma rays emitted by blazars are unique probes of cosmic magnetism, as their interactions with pervasive radiation fields generate a short-lived charged component sensitive to intervening magnetic fields. Spatial and temporal properties of the secondary gamma rays generated in the electromagnetic cascade can provide information about the strength, power spectrum, and topology of IGMFs. To probe these fields, detailed simulations of gamma-ray propagation in the intergalactic medium are necessary. In this work the effects of magnetic fields on the spectrum and arrival directions of gamma rays are studied using three-dimensional simulations, emphasising the particular case of helical IGMFs.
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Cosmic ray acceleration by relativistic shocks: Limits and estimates

Monthly Notices of the Royal Astronomical Society Oxford University Press (2017)

Authors:

AR Bell, AT Araudo, James H Matthews, Katherine M Blundell

Abstract:

We examine limits to the energy to which cosmic rays can be accelerated by relativistic shocks, showing that acceleration of light ions as high as 100 EeV is unlikely. The implication of our estimates is that if ultra-high energy cosmic rays are accelerated by shocks, then those shocks are probably not relativistic.
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