Pulsars, transients and relativistic astrophysics

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Particle acceleration and magnetic field amplification in hotspots of FR II galaxies: The case study 4C74.26

Astrophysical Journal University of Chicago Press (2015)

Authors:

AT Araudo, AR Bell, KM Blundell

Abstract:

It has been suggested that relativistic shocks in extragalactic sources may accelerate the most energetic cosmic rays. However, recent theoretical advances indicating that relativistic shocks are probably unable to accelerate particles to energies much larger than a PeV cast doubt on this. In the present contribution we model the radio to X-ray emission in the southern hotspot of the quasar 4C74.26. The synchrotron radio emission is resolved near the shock with the MERLIN radio-interferometer, and the rapid decay of this emission behind the shock is interpreted as the decay of the downstream magnetic field as expected for small scale turbulence. If our result is confirmed by analyses of other radiogalaxies, it provides firm observational evidence that relativistic shocks at the termination region of powerful jets in FR II radiogalaxies do not accelerate ultra high energy cosmic rays.

Radio monitoring of the hard state jets in the 2011 outburst of MAXI J1836−194

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 450:2 (2015) 1745-1759

Authors:

TD Russell, JCA Miller-Jones, PA Curran, R Soria, D Altamirano, S Corbel, M Coriat, A Moin, DM Russell, GR Sivakoff, TJ Slaven-Blair, TM Belloni, RP Fender, S Heinz, PG Jonker, HA Krimm, EG Körding, D Maitra, S Markoff, M Middleton, S Migliari, RA Remillard, MP Rupen, CL Sarazin, AJ Tetarenko, MAP Torres, V Tudose, AK Tzioumis

LORD OF THE RINGS: A KINEMATIC DISTANCE TO CIRCINUS X-1 FROM A GIANT X-RAY LIGHT ECHO

The Astrophysical Journal American Astronomical Society 806:2 (2015) 265

Authors:

S Heinz, M Burton, C Braiding, WN Brandt, PG Jonker, P Sell, RP Fender, MA Nowak, NS Schulz

Lord of the Rings: A Kinematic Distance to Circinus X-1 from a Giant X-Ray Light Echo

(2015)

Authors:

Sebastian Heinz, Michael G Burton, Catherine Braiding, William N Brandt, Peter G Jonker, Paul Sell, Robert P Fender, Michael A Nowak, Norbert S Schulz

THE NEEDLE IN THE 100 deg2 HAYSTACK: UNCOVERING AFTERGLOWS OF FERMI GRBs WITH THE PALOMAR TRANSIENT FACTORY

The Astrophysical Journal American Astronomical Society 806:1 (2015) 52

Authors:

Leo P Singer, Mansi M Kasliwal, S Bradley Cenko, Daniel A Perley, Gemma E Anderson, GC Anupama, Iair Arcavi, Varun Bhalerao, Brian D Bue, Yi Cao, Valerie Connaughton, Alessandra Corsi, Antonino Cucchiara, Rob P Fender, Derek B Fox, Neil Gehrels, Adam Goldstein, J Gorosabel, Assaf Horesh, Kevin Hurley, Joel Johansson, DA Kann, Chryssa Kouveliotou, Kuiyun Huang, SR Kulkarni, Frank Masci, Peter Nugent, Arne Rau, Umaa D Rebbapragada, Tim D Staley, Dmitry Svinkin, CC Thöne, A de Ugarte Postigo, Yuji Urata, Alan Weinstein