Switched magnetospheric regulation of pulsar spin-down.
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TLDR
It is shown that the rotation of pulsars is not modulated by a single spin-down rate but typically by two, each accompanied by a unique pulse profile, and that for six pulsars the timing noise is correlated with changes in the pulse shape.Abstract:
Pulsars are famed for their rotational clocklike stability and their highly repeatable pulse shapes. However, it has long been known that there are unexplained deviations (often termed timing noise) from the rate at which we predict these clocks should run. We show that timing behavior often results from two different spin-down rates. Pulsars switch abruptly between these states, often quasi-periodically, leading to the observed spin-down patterns. We show that for six pulsars the timing noise is correlated with changes in the pulse shape. Many pulsar phenomena, including mode changing, nulling, intermittency, pulse-shape variability, and timing noise, are therefore linked and are caused by changes in the pulsar's magnetosphere. We consider the possibility that high-precision monitoring of pulse profiles could lead to the formation of highly stable pulsar clocks.read more
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Journal ArticleDOI
LOFAR: The LOw-Frequency ARray
M. P. van Haarlem,Michael W. Wise,Michael W. Wise,A. W. Gunst,George Heald,John McKean,Jason W. T. Hessels,Jason W. T. Hessels,de Antonius Bruyn,de Antonius Bruyn,R. Nijboer,John D. Swinbank,Richard Fallows,Michiel A. Brentjens,A. Nelles,Rainer Beck,Heino Falcke,Heino Falcke,Rob Fender,Jörg R. Hörandel,Luitje Koopmans,G. Mann,George K. Miley,Huub Röttgering,B. W. Stappers,Ralph A. M. J. Wijers,Saleem Zaroubi,M. van den Akker,A. Alexov,J. M. Anderson,Kenneth C. Anderson,A. van Ardenne,A. van Ardenne,Michel Arts,Ashish Asgekar,I. M. Avruch,I. M. Avruch,F. Batejat,L. Bähren,Martin Bell,Michael R. Bell,I. van Bemmel,P. Bennema,Mark J. Bentum,Gianni Bernardi,Philip Best,Laura Birzan,Annalisa Bonafede,Albert-Jan Boonstra,Robert Braun,Joel N. Bregman,F. Breitling,R. H. van de Brink,J. W. Broderick,P. C. Broekema,W. N. Brouw,W. N. Brouw,Marcus Brüggen,Harvey Butcher,Harvey Butcher,W. A. van Cappellen,B. Ciardi,T. Coenen,John Conway,A. H. W. M. Coolen,Arthur Corstanje,S. Damstra,O. Davies,Adam Deller,R. J. Dettmar,G. van Diepen,K. Dijkstra,P. Donker,A. Doorduin,J. Dromer,M. Drost,A. van Duin,Jochen Eislöffel,J. van Enst,Chiara Ferrari,Wilfred Frieswijk,H. Gankema,M. A. Garrett,M. A. Garrett,F. de Gasperin,M. Gerbers,E. de Geus,J.-M. Grießmeier,J.-M. Grießmeier,T. Grit,P. Gruppen,J. P. Hamaker,Tim Hassall,Matthias Hoeft,H. A. Holties,A. Horneffer,A. Horneffer,A. J. van der Horst,A. van Houwelingen,A. Huijgen,Marco Iacobelli,Hubertus Intema,Hubertus Intema,N. J. Jackson,Vibor Jelić,A. de Jong,E. Juette,D. Kant,Aris Karastergiou,A. Koers,H. Kollen,V. I. Kondratiev,E. Kooistra,Y. Koopman,A. Koster,M. Kuniyoshi,Michael Kramer,Michael Kramer,G. Kuper,P. Lambropoulos,Casey J. Law,Casey J. Law,J. van Leeuwen,J. van Leeuwen,J. Lemaitre,M. Loose,P. Maat,Giulia Macario,Sera Markoff,J. Masters,J. Masters,Rebecca McFadden,D. McKay-Bukowski,H. Meijering,H. Meulman,M. Mevius,Enno Middelberg,R. Millenaar,James Miller-Jones,James Miller-Jones,R. N. Mohan,J. D. Mol,J. Morawietz,Raffaella Morganti,Raffaella Morganti,D. D. Mulcahy,E. Mulder,H. Munk,Lambert J.M. Nieuwenhuis,R. van Nieuwpoort,J. E. Noordam,M. J. Norden,A. Noutsos,A. R. Offringa,Hans Olofsson,Amitesh Omar,Emanuela Orrú,Emanuela Orrú,R. Overeem,H. Paas,M. Pandey-Pommier,Vishambhar Pandey,Roberto Pizzo,A. G. Polatidis,D. A. Rafferty,Steve Rawlings,W. Reich,J.-P. de Reijer,J. Reitsma,G.A. Renting,P. Riemers,E. Rol,J. W. Romein,J. Roosjen,M. Ruiter,Anna M. M. Scaife,K. van der Schaaf,Bart Scheers,Bart Scheers,Pim Schellart,A. P. Schoenmakers,G. Schoonderbeek,M. Serylak,M. Serylak,Aleksandar Shulevski,J. Sluman,Oleg Smirnov,Charlotte Sobey,H. Spreeuw,Matthias Steinmetz,C. G. M. Sterks,H.-J. Stiepel,K. Stuurwold,Michel Tagger,Y. Tang,C. Tasse,I. Thomas,Satyendra Thoudam,M. C. Toribio,B. van der Tol,O. Usov,M. van Veelen,A.-J. van der Veen,S. ter Veen,Joris P. W. Verbiest,R. Vermeulen,N. J. Vermaas,C. Vocks,C. Vogt,M. de Vos,E. van der Wal,R. J. van Weeren,R. J. van Weeren,H. Weggemans,Patrick Weltevrede,Simon D. M. White,Stefan J. Wijnholds,T. Wilhelmsson,Olaf Wucknitz,Sarod Yatawatta,Philippe Zarka,Anton Zensus,J. E. van Zwieten +222 more
TL;DR: In dit artikel zullen the authors LOFAR beschrijven: van de astronomische mogelijkheden met de nieuwe telescoop tot aan een nadere technische beshrijving of het instrument.
Journal ArticleDOI
The NANOGrav 11-year Data Set: High-precision Timing of 45 Millisecond Pulsars
Zaven Arzoumanian,Adam Brazier,Sarah Burke-Spolaor,S. J. Chamberlin,Shami Chatterjee,B. Christy,James M. Cordes,Neil J. Cornish,Fronefield Crawford,H. Thankful Cromartie,Kathryn Crowter,Megan E. DeCesar,Paul Demorest,Timothy Dolch,Justin A. Ellis,Robert D. Ferdman,Elizabeth C. Ferrara,Emmanuel Fonseca,Nathan Garver-Daniels,Peter A. Gentile,Daniel Halmrast,E. A. Huerta,Fredrick A. Jenet,Cody Jessup,Glenn Jones,Megan L. Jones,David L. Kaplan,Michael T. Lam,T. Joseph W. Lazio,Lina Levin,Andrea N. Lommen,Duncan R. Lorimer,Jing Luo,Ryan S. Lynch,D. R. Madison,A. M. Matthews,Maura McLaughlin,Sean T. McWilliams,Chiara M. F. Mingarelli,Cherry Ng,David J. Nice,Timothy T. Pennucci,Scott M. Ransom,Paul S. Ray,Xavier Siemens,Joseph Simon,Renée Spiewak,Ingrid H. Stairs,Daniel R. Stinebring,Kevin Stovall,Joseph K. Swiggum,Stephen Taylor,Michele Vallisneri,Rutger van Haasteren,Sarah J. Vigeland,Weiwei Zhu +55 more
TL;DR: In this article, the authors presented high-precision timing data over time spans of up to 11 years for 45 millisecond pulsars observed as part of the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) project, aimed at detecting and characterizing low-frequency gravitational waves.
Journal ArticleDOI
A study of 315 glitches in the rotation of 102 pulsars
TL;DR: In this article, the rotation of more than 700 pulsars has been monitored using the 76m Lovell Telescope at Jodrell Bank and a new search for glitches in the observations was conducted, revealing 128 new glitches in rotation of 63 pulsars.
Journal ArticleDOI
The NANOGrav Eleven-year Data Set: High-precision timing of 45 Millisecond Pulsars
Zaven Arzoumanian,Adam Brazier,Sarah Burke-Spolaor,S. J. Chamberlin,Shami Chatterjee,B. Christy,James M. Cordes,Neil J. Cornish,Fronefield Crawford,H. Thankful Cromartie,Kathryn Crowter,Megan E. DeCesar,Paul Demorest,Timothy Dolch,Justin A. Ellis,Robert D. Ferdman,Elizabeth C. Ferrara,Emmanuel Fonseca,Nathan Garver-Daniels,Peter A. Gentile,Daniel Halmrast,E. A. Huerta,Fredrick A. Jenet,Cody Jessup,Glenn Jones,Megan L. Jones,David L. Kaplan,Michael T. Lam,T. Joseph W. Lazio,Lina Levin,Andrea N. Lommen,Duncan R. Lorimer,Jing Luo,Ryan S. Lynch,Dustin R. Madison,A. M. Matthews,Maura McLaughlin,Sean T. McWilliams,Chiara M. F. Mingarelli,Cherry Ng,David J. Nice,Timothy T. Pennucci,Scott M. Ransom,Paul S. Ray,Xavier Siemens,Joseph Simon,Renée Spiewak,Ingrid H. Stairs,Daniel R. Stinebring,Kevin Stovall,Joseph K. Swiggum,Stephen Taylor,Michele Vallisneri,Rutger van Haasteren,Sarah J. Vigeland,Weiwei Zhu +55 more
TL;DR: In this article, the authors presented high-precision timing data over time spans of up to 11 years for 45 millisecond pulsars observed as part of the NANOGrav project, aimed at detecting and characterizing low-frequency gravitational waves.
Journal ArticleDOI
Observing pulsars and fast transients with LOFAR
B. W. Stappers,Jason W. T. Hessels,Jason W. T. Hessels,A. Alexov,Kenneth C. Anderson,T. Coenen,T. E. Hassall,Aris Karastergiou,V. I. Kondratiev,Michael Kramer,Michael Kramer,J. van Leeuwen,J. van Leeuwen,J. D. Mol,A. Noutsos,John W. Romein,Patrick Weltevrede,Rob Fender,Ralph A. M. J. Wijers,L. Bähren,Martin Bell,J. W. Broderick,E. J. Daw,V. S. Dhillon,Jochen Eislöffel,Heino Falcke,Heino Falcke,J. M. Griessmeier,J. M. Griessmeier,Casey J. Law,Casey J. Law,Sera Markoff,James Miller-Jones,James Miller-Jones,Bart Scheers,H. Spreeuw,John D. Swinbank,S. ter Veen,Michael W. Wise,Michael W. Wise,Olaf Wucknitz,Philippe Zarka,J. M. Anderson,Ashish Asgekar,I. M. Avruch,I. M. Avruch,Rainer Beck,P. Bennema,Mark J. Bentum,Philip Best,Joel N. Bregman,Michiel A. Brentjens,R. H. van de Brink,P. C. Broekema,W. N. Brouw,Marcus Brüggen,A. G. de Bruyn,A. G. de Bruyn,Harvey Butcher,Harvey Butcher,B. Ciardi,John Conway,R.-J. Dettmar,A. van Duin,J. van Enst,M. A. Garrett,M. A. Garrett,M. Gerbers,T. Grit,A. W. Gunst,M. P. van Haarlem,J. P. Hamaker,George Heald,Matthias Hoeft,H. A. Holties,A. Horneffer,A. Horneffer,Léon V. E. Koopmans,Gerard H. Kuper,M. Loose,P. Maat,D. McKay-Bukowski,John McKean,George K. Miley,Raffaella Morganti,Raffaella Morganti,R. Nijboer,J. Noordam,M. J. Norden,Hans Olofsson,M. Pandey-Pommier,A. G. Polatidis,Wolfgang Reich,H. J. A. Röttgering,A. Schoenmakers,J. Sluman,Oleg Smirnov,Matthias Steinmetz,C. G. M. Sterks,Michel Tagger,Y. Tang,R. Vermeulen,N. J. Vermaas,C. Vogt,M. de Vos,Stefan J. Wijnholds,Sarod Yatawatta,A. Zensus +107 more
TL;DR: The LOw Frequency ARray (LOFAR) as mentioned in this paper is a radio interferometer operating in the lowest 4 octaves of the ionospheric "radio window": 10-240 MHz, that will greatly facilitate observing pulsars at low radio frequencies.
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