Pulsar Observations of Extreme Scattering Events
William A. Coles,Matthew Kerr,Ryan Shannon,George Hobbs,Richard N. Manchester,X. P. You,Matthew Bailes,N. D. R. Bhat,Sarah Burke-Spolaor,Shi Dai,Michael Keith,Yuri Levin,Stefan Oslowski,Vikram Ravi,Daniel J. Reardon,L. Toomey,W. van Straten,Jing Wang,Linqing Wen,Xing-Jiang Zhu +19 more
TLDR
In this article, the Parkes Pulsar Timing Array (PPTA) was used to make more complete models of the ESE, including an estimate of the "outer-scale" of the turbulence in the plasma lens.Abstract:
Extreme scattering events (ESEs) in the interstellar medium (ISM) were first observed in regular flux measurements of compact extragalactic sources. They are characterized by a flux variation over a period of weeks, suggesting the passage of a "diverging plasma lens" across the line of sight. Modeling the refraction of such a lens indicates that the structure size must be of order AU and the electron density of order 10s of cm^{-3}. Similar structures have been observed in measurements of pulsar intensity scintillation and group delay. Here we report observations of two ESEs showing increases in both intensity scintillation and dispersion made with the Parkes Pulsar Timing Array (PPTA). These allow us to make more complete models of the ESE, including an estimate of the "outer-scale" of the turbulence in the plasma lens. These observations show clearly that the ESE structure is fully turbulent on an AU scale. They provide some support for the idea that the structures are extended along the line of sight, such as would be the case for a scattering shell. The dispersion measurements also show a variety of AU scale structures which would not be called ESEs, yet involve electron density variations typical of ESEs and likely have the same origin.read more
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Journal ArticleDOI
High-precision timing of 42 millisecond pulsars with the European Pulsar Timing Array
Gregory Desvignes,R. N. Caballero,L. Lentati,Joris P. W. Verbiest,Joris P. W. Verbiest,D. J. Champion,Benjamin Stappers,Gemma H. Janssen,P. Lazarus,Stefan Oslowski,Stefan Oslowski,S. Babak,C. G. Bassa,P. Brem,M. Burgay,Ismaël Cognard,J. R. Gair,E. Graikou,Lucas Guillemot,Jason W. T. Hessels,Jason W. T. Hessels,A. Jessner,Christine Jordan,Ramesh Karuppusamy,Michael Kramer,A. Lassus,K. Lazaridis,Kejia Lee,Kang Liu,Andrew Lyne,J. W. McKee,Chiara M. F. Mingarelli,Delphine Perrodin,Antoine Petiteau,A. Possenti,M. B. Purver,Pablo Rosado,Pablo Rosado,S. Sanidas,Alberto Sesana,G. Shaifullah,R. Smits,Stephen Taylor,Stephen Taylor,Gilles Theureau,Caterina Tiburzi,Caterina Tiburzi,R. van Haasteren,Alberto Vecchio +48 more
TL;DR: In this paper, the authors report on timing, flux density, and polarimetric observations of the transient magnetar and 5.54 s radio pulsar XTE J1810-197 using the GBT, Nancay, and Parkes radio telescopes beginning in early 2006, until its sudden disappearance as a radio source in late 2008.
Journal ArticleDOI
The International Pulsar Timing Array: First Data Release
Joris P. W. Verbiest,Joris P. W. Verbiest,L. Lentati,George Hobbs,R. van Haasteren,Paul Demorest,Gemma H. Janssen,J. B. Wang,Gregory Desvignes,R. N. Caballero,Michael Keith,D. J. Champion,Zaven Arzoumanian,Stanislav Babak,C. G. Bassa,N. D. R. Bhat,A. Brazier,P. Brem,M. Burgay,Sarah Burke-Spolaor,S. J. Chamberlin,Sourav Chatterjee,B. Christy,Ismaël Cognard,Ismaël Cognard,James M. Cordes,Shi Dai,Shi Dai,Timothy Dolch,Timothy Dolch,Justin A. Ellis,Robert D. Ferdman,Emmanuel Fonseca,Jonathan R. Gair,N. Garver-Daniels,Peter A. Gentile,Marjorie Gonzalez,E. Graikou,Lucas Guillemot,Lucas Guillemot,Jason W. T. Hessels,Jason W. T. Hessels,Glenn Jones,Ramesh Karuppusamy,Matthew Kerr,Michael Kramer,Michael T. Lam,Paul D. Lasky,A. Lassus,P. Lazarus,T. J. W. Lazio,Kejia Lee,Lina Levin,Lina Levin,Kang Liu,R. S. Lynch,Andrew Lyne,J. W. McKee,Maura McLaughlin,Sean T. McWilliams,D. R. Madison,Richard N. Manchester,Chiara M. F. Mingarelli,Chiara M. F. Mingarelli,David J. Nice,Stefan Oslowski,Stefan Oslowski,Nipuni Palliyaguru,Timothy T. Pennucci,Benetge Perera,Delphine Perrodin,A. Possenti,Antoine Petiteau,Scott M. Ransom,Daniel J. Reardon,Daniel J. Reardon,Pablo Rosado,S. A. Sanidas,Alberto Sesana,G. Shaifullah,G. Shaifullah,Ryan Shannon,Ryan Shannon,X. Siemens,Joseph Simon,R. Smits,Renée Spiewak,Ingrid H. Stairs,Benjamin Stappers,Daniel R. Stinebring,Kevin Stovall,J. K. Swiggum,Stephen Taylor,Gilles Theureau,Gilles Theureau,Gilles Theureau,Caterina Tiburzi,Caterina Tiburzi,L. Toomey,Michele Vallisneri,W. van Straten,Alberto Vecchio,Yue-Fei Wang,Linqing Wen,X. P. You,Weiwei Zhu,Xing-Jiang Zhu +106 more
TL;DR: In this article, the first joint analysis of the data from the three regional pulsar timing arrays (IPTA) is presented, i.e. of the first IPTA data set, and the approach presently followed for its combination and suggest improvements for future PTA research.
Posted Content
Timing analysis for 20 millisecond pulsars in the Parkes Pulsar Timing Array
Daniel J. Reardon,George Hobbs,William A. Coles,Yuri Levin,Michael Keith,Matthew Bailes,N. D. R. Bhat,Sarah Burke-Spolaor,Shi Dai,Shi Dai,Matthew Kerr,Paul D. Lasky,Richard N. Manchester,Stefan Oslowski,Stefan Oslowski,Vikram Ravi,Vikram Ravi,Ryan Shannon,W. van Straten,L. Toomey,Jiali Wang,Linqing Wen,X. P. You,Xing-Jiang Zhu +23 more
TL;DR: In this article, the Parkes Pulsar Timing Array was used to estimate the parallax of 20 millisecond pulsars with a precision of 0.16% and a distance measurement at the 0.79% level of precision.
Journal ArticleDOI
From spin noise to systematics: Stochastic processes in the first International Pulsar Timing Array data release
L. Lentati,Ryan Shannon,Ryan Shannon,William A. Coles,Joris P. W. Verbiest,Joris P. W. Verbiest,R. van Haasteren,Justin A. Ellis,R. N. Caballero,Richard N. Manchester,Zaven Arzoumanian,S. Babak,C. G. Bassa,N. D. R. Bhat,P. Brem,M. Burgay,Sarah Burke-Spolaor,D. J. Champion,Sourav Chatterjee,Ismaël Cognard,Ismaël Cognard,James M. Cordes,Shi Dai,Shi Dai,Paul Demorest,Gregory Desvignes,Timothy Dolch,Timothy Dolch,Robert D. Ferdman,Emmanuel Fonseca,Jonathan R. Gair,Marjorie Gonzalez,E. Graikou,Lucas Guillemot,Lucas Guillemot,Jason W. T. Hessels,Jason W. T. Hessels,George Hobbs,Gemma H. Janssen,Glenn Jones,Ramesh Karuppusamy,Michael Keith,Matthew Kerr,Michael Kramer,Michael T. Lam,Paul D. Lasky,A. Lassus,P. Lazarus,T. J. W. Lazio,Kejia Lee,Lina Levin,Lina Levin,Kang Liu,R. S. Lynch,D. R. Madison,J. W. McKee,Maura McLaughlin,Sean T. McWilliams,Chiara M. F. Mingarelli,Chiara M. F. Mingarelli,David J. Nice,Stefan Oslowski,Stefan Oslowski,Timothy T. Pennucci,Benetge Perera,Delphine Perrodin,Antoine Petiteau,A. Possenti,Scott M. Ransom,Daniel J. Reardon,Daniel J. Reardon,Pablo Rosado,S. A. Sanidas,Alberto Sesana,G. Shaifullah,G. Shaifullah,X. Siemens,R. Smits,Ingrid H. Stairs,Benjamin Stappers,Daniel R. Stinebring,Kevin Stovall,J. K. Swiggum,J. K. Swiggum,Stephen Taylor,Gilles Theureau,Gilles Theureau,Gilles Theureau,Caterina Tiburzi,Caterina Tiburzi,L. Toomey,Michele Vallisneri,W. van Straten,Alberto Vecchio,J. B. Wang,Yue-Fei Wang,X. P. You,Weiwei Zhu,Xing-Jiang Zhu +98 more
TL;DR: In this paper, the authors analyse the stochastic properties of the 49 pulsars that comprise the first International Pulsar Timing Array (IPTA) data release and use Bayesian methodology, performing model selection to determine the optimal description of the signal present in each pulsar.
Journal ArticleDOI
Parkes Pulsar Timing Array constraints on ultralight scalar-field dark matter
N.K. Porayko,Xing-Jiang Zhu,Y. Levin,L. Hui,George Hobbs,A. Grudskaya,Konstantin Postnov,Matthew Bailes,Ramesh Bhat,William A. Coles,Shi Dai,James Dempsey,Michael Keith,Matthew Kerr,Michael Kramer,Paul D. Lasky,Richard N. Manchester,Stefan Oslowski,Aditya Parthasarathy,Vilupanur A. Ravi,Daniel J. Reardon,Pablo Rosado,Christopher J. Russell,Ryan Shannon,Renée Spiewak,W. van Straten,Lawrence Toomey,Jingbo Wang,Linqing Wen,X. P. You +29 more
TL;DR: The Parkes Pulsar Timing Array (PPTA) has been monitoring 20 millisecond pulsars at two-to-three-week intervals for more than a decade.
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