Gamma-ray astronomy

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Energetic eruptions leading to a peculiar hydrogen-rich explosion of a massive star

(2017)

Authors:

Iair Arcavi, D Andrew Howell, Daniel Kasen, Lars Bildsten, Griffin Hosseinzadeh, Curtis McCully, Zheng Chuen Wong, Sarah Rebekah Katz, Avishay Gal-Yam, Jesper Sollerman, Francesco Taddia, Giorgos Leloudas, Christoffer Fremling, Peter E Nugent, Assaf Horesh, Kunal Mooley, Clare Rumsey, S Bradley Cenko, Melissa L Graham, Daniel A Perley, Ehud Nakar, Nir J Shaviv, Omer Bromberg, Ken J Shen, Eran O Ofek, Yi Cao, Xiaofeng Wang, Fang Huang, Liming Rui, Tianmeng Zhang, Wenxiong Li, Zhitong Li, Jujia Zhang, Stefano Valenti, David Guevel, Benjamin Shappee, Christopher S Kochanek, Thomas W-S Holoien, Alexei V Filippenko, Rob Fender, Anders Nyholm, Ofer Yaron, Mansi M Kasliwal, Mark Sullivan, Nadja Blagorodnova, Richard S Walters, Ragnhild Lunnan, Danny Khazov, Igor Andreoni, Russ R Laher, Nick Konidaris, Przemek Wozniak, Brian Bue
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Ultrahigh-energy cosmic rays from tidally-ignited white dwarfs

Physical Review D American Physical Society 96:10 (2017) 103003

Authors:

Rafael Alves Batista, Joseph Silk

Abstract:

Ultrahigh-energy cosmic rays (UHECRs) can be accelerated by tidal disruption events of stars by black holes. We suggest a novel mechanism for UHECR acceleration wherein white dwarfs (WDs) are tidally compressed by intermediate-mass black holes (IMBHs), leading to their ignition and subsequent explosion as a supernova. Cosmic rays accelerated by the supernova may receive an energy boost when crossing the accretion-powered jet. The rate of encounters between WDs and IMBHs can be relatively high, as the number of IMBHs may be substantially augmented once account is taken of their likely presence in dwarf galaxies. Here we show that this kind of tidal disruption event naturally provides an intermediate composition for the observed UHECRs, and suggest that dwarf galaxies and globular clusters are suitable sites for particle acceleration to ultrahigh energies.
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Paving the way to simultaneous multi-wavelength astronomy

New Astronomy Reviews Elsevier 79 (2017) 26-48

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 Díaz Trigo, C Done, M Kotze, S Eikenberry, R Fender, P Ferruit, F Fürst, 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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Radio Transients in the Era of Multi-Messenger Astrophysics

Proceedings of the International Astronomical Union Cambridge University Press (CUP) 14:S339 (2017) 207-214

Authors:

GE Anderson, BW Stappers, I Andreoni, M Caleb, D Coppejans, S Corbel, RP Fender, M Giroletti, ML Graham, KV Sokolovsky, PA Woudt
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The reverberation signatures of rotating disc winds in active galactic nuclei

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 471:4 (2017) 4798-4811

Authors:

SW Mangham, C Knigge, JH Matthews, KS Long, SA Sim, N Higginbottom
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