LOFAR discovery of a quiet emission mode in PSR B0823+26

C. Sobey 1 N. J. Young 2 J. W. T. Hessels 3 P. Weltevrede 4 A. Noutsos 1 B. W. Stappers 4 M. Kramer 1, 5 C. Bassa 6 A. G. Lyne 4 V. I. Kondratiev 7 T. E. Hassall 4 E. F. Keane 8 A. V. Bilous 9 R. P. Breton 4 Jean-Mathias Grießmeier 10 A. Karastergiou 11, 12 M. Pilia 7 M. Serylak 10, 13 S. ter Veen 9 J. van Leeuwen 3 A. Alexov 7 J. Anderson 14 A. Asgekar 7 I. M. Avruch 15 M. E. Bell 16 M. J. Bentum 7 G. Bernardi 17 P. Best 18 L. Bîrzan 19 A. Bonafede 20 F. Breitling 21 J. Broderick 22 M. Brüggen 20 A. Corstanje 23 D. Carbone 3 E. de Geus 24 M. de Vos 7 A. van Duin 7 S. Duscha 7 J. Eislöffel 25 H. Falcke 23 R. A. Fallows 26 R. Fender 22 C. Ferrari 27 W. Frieswijk 7 M. A. Garrett 19 A. W. Gunst 7 J. P. Hamaker 7 G. Heald 7 M. Hoeft 25 J. Hörandel 23 E. Jütte 28 G. Kuper 7 P. Maat 7 G. Mann 29 S. Markoff 30 R. Mcfadden 7 D. Mckay-Bukowski 31 J. P. Mckean 7 D. D. Mulcahy 22 H. Munk 7 A. Nelles 23 M. J. Norden 7 E. Orrù 7 H. Paas 32 M. Pandey-Pommier 33 V. N. Pandey 34 G. Pietka 12 R. Pizzo 7 A. G. Polatidis 7 D. Rafferty 35 A. Renting 7 H. Röttgering 19 A. Rowlinson 16 A. M. M. Scaife 36 D. Schwarz 37 J. Sluman 7 O. Smirnov 38 M. Steinmetz 39 A. Stewart 40 J. Swinbank 30 Michel Tagger 10 Y. Tang 41 C. Tasse 42, 43 S. Thoudam 23 C. Toribio 7 R. Vermeulen 7 C. Vocks 29 R. J. van Weeren 44 R. A. M. J. Wijers 30 M. W. Wise 30 O. Wucknitz 45 S. Yatawatta 7 P. Zarka 46
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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.
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C. Sobey, N. J. Young, J. W. T. Hessels, P. Weltevrede, A. Noutsos, et al.. LOFAR discovery of a quiet emission mode in PSR B0823+26. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2015, 451 (3), pp.2493-2506. ⟨10.1093/mnras/stv1066⟩. ⟨insu-01323239⟩

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