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1 MPIFR - Max-Planck-Institut für Radioastronomie 2 University of Minnesota Minneapolis 3 UvA - University of Amsterdam Amsterdam 4 Jodrell Bank Centre for Astrophysics 5 Max-Planck-Institut für Radioastronomie 6 COLUMBIA UNIVERSITY - Columbia Astrophysics Laboratory 7 Cornell University 8 ASTRON - ASTRON 9 CAS - Centre for Astrophysics and Supercomputing Swinburne 10 IMAPP - Institute for Mathematics, Astrophysics and Particle Physics 11 LPC2E - Laboratoire de Physique et Chimie de l-Environnement et de l-Espace 12 Rhodes University 13 Astrophysics, University of Oxford 14 USN - Unité Scientifique de la Station de Nançay 15 Institute for Mathematics Applied to Geoscience 16 Netherlands Institute for Radio Astronomy ASTRON 17 SRON - SRON Netherlands Institute for Space Research 18 CSIRO - CSIRO Astronomy & Space Science 19 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies 20 University of Edinburgh, Royal Observatory 21 Leiden Observatory Leiden 22 Jacobs University Bremen 23 Leibniz Inst Astrophys Potsdam AIP 24 University of Southampton Southampton, UK 25 Radboud university Nijmegen 26 Medstar Research Institute 27 Thüringer Landessternwarte Tautenburg 28 Institute of Mathematical and Physical Sciences 29 Département de Géologie 30 LEIDEN OBSERVATORY - Leiden Observatory 31 University Bochum 32 Astrophysikalisches Insitut Potsdam 33 AI PANNEKOEK - Astronomical Institute Anton Pannekoek 34 University of Oulu 35 University of Southampton Southampton 36 Center for Information Technology CIT 37 CRAL - Centre de Recherche Astrophysique de Lyon 38 National Radio Astronomy Observatory 39 Department of Astronomy and Astrophysics 40 School of Physics and Astronomy Southampton 41 Interactions Son Musique Mouvement STMS - Sciences et Technologies de la Musique et du Son 42 Rhodes University 43 Leibniz Institute DSMZ Germany 44 LASP - Laboratory for Atmospheric and Space Physics Boulder 45 UP11 - Université Paris-Sud - Paris 11 46 LESIA - Laboratoire d-études spatiales et d-instrumentation en astrophysique 47 SKA South Africa 48 CfA - Harvard-Smithsonian Center for Astrophysics 49 Institute for Astronomy, University of Amsterdam, The Netherland 50 Argelander Institut für Astronomie 51 OP - Observatoire de Paris - Site de Paris

Abstract : PSR B0823+26, a 0.53-s radio pulsar, displays a host of emission phenomena over timescales of seconds to at least hours, including nulling, subpulse drifting, and mode-changing. Studying pulsars like PSR B0823+26 provides further insight into the relationship between these various emission phenomena and what they might teach us about pulsar magnetospheres. Here we report on the LOFAR discovery that PSR B0823+26 has a weak and sporadically emitting -quiet- Q emission mode that is over 100 times weaker on average and has a nulling fraction forty-times greater than that of the more regularly-emitting -bright- B mode. Previously, the pulsar has been undetected in the Q-mode, and was assumed to be nulling continuously. PSR B0823+26 shows a further decrease in average flux just before the transition into the B-mode, and perhaps truly turns off completely at these times. Furthermore, simultaneous observations taken with the LOFAR, Westerbork, Lovell, and Effelsberg telescopes between 110 MHz and 2.7 GHz demonstrate that the transition between the Q-mode and B-mode occurs within one single rotation of the neutron star, and that it is concurrent across the range of frequencies observed.

Keywords : PSR B0823+26-radio telescopes individual stars neutron- pulsars magnetosphere-pulsars

Autor: C. Sobey - N. J. Young - J. W. T. Hessels - P. Weltevrede - A. Noutsos - B. W. Stappers - M. Kramer - C. Bassa - A. G. Lyne - V.

Fuente: https://hal.archives-ouvertes.fr/


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