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Measurement and correction of variations in interstellar dispersion in high-precision pulsar timing
M. J. Keith, W. Coles, R. M. Shannon +16
Signals from radio pulsars show a wavelength-dependent delay due to dispersion in the interstellar plasma. At a typical observing wavelength, this delay can vary by tens of microse…
Tracking dispersion measure variations of timing array pulsars with the GMRT
Ujjwal Kumar, Yashwant Gupta, Willem van Straten +5
We present the results from nearly three years of monitoring of the variations in dispersion measure (DM) along the line-of-sight to 11 millisecond pulsars using the Giant Metrewav…
The Parkes Pulsar Timing Array Project
R. N. Manchester, G. Hobbs, M. Bailes +28
A "pulsar timing array" (PTA), in which observations of a large sample of pulsars spread across the celestial sphere are combined, allows investigation of "global" phenomena such a…
A Shapiro delay detection in the binary system hosting the millisecond pulsar PSR J1910-5959A
A. Corongiu, M. Burgay, A. Possenti +9
PSR J1910-5959A is a binary pulsar with a helium white dwarf companion located about 6 arcmin from the center of the globular cluster NGC6752. Based on 12 years of observations at…
PSR J1141-6545: a powerful laboratory of GR and tensor-scalar theories of gravity
J. P. W. Verbiest, N. D. R. Bhat, M. Bailes
Pulsars in close binary systems have provided some of the most stringent tests of strong-field gravity to date. The pulsar--white-dwarf binary system J1141-6545 is specifically int…
The High Time Resolution Universe Survey VI: An Artificial Neural Network and Timing of 75 Pulsars
S. D. Bates, M. Bailes, B. R. Barsdell +19
We present 75 pulsars discovered in the mid-latitude portion of the High Time Resolution Universe survey, 54 of which have full timing solutions. All the pulsars have spin periods…
Development of a pulsar-based timescale
G. Hobbs, W. Coles, R. N. Manchester +21
Using observations of pulsars from the Parkes Pulsar Timing Array (PPTA) project we develop the first pulsar-based timescale that has a precision comparable to the uncertainties in…
The relativistic pulsar-white dwarf binary PSR J1738+0333 II. The most stringent test of scalar-tensor gravity
Paulo C. C. Freire, Norbert Wex, Gilles Esposito-Farèse +7
(abridged) We report the results of a 10-year timing campaign on PSR J1738+0333, a 5.85-ms pulsar in a low-eccentricity 8.5-hour orbit with a low-mass white dwarf companion (...) T…
Radio emission evolution, polarimetry and multifrequency single pulse analysis of the radio magnetar PSR J1622-4950
L. Levin, M. Bailes, S. D. Bates +11
Here we report on observations of the radio magnetar PSR J1622-4950 at frequencies from 1.4 to 17 GHz. We show that although its flux density is varying up to a factor of ~10 withi…
The High Time Resolution Universe Survey - V: Single-pulse energetics and modulation properties of 315 pulsars
S. Burke-Spolaor, S. Johnston, M. Bailes +11
We report on the pulse-to-pulse energy distributions and phase-resolved modulation properties for catalogued pulsars in the southern High Time Resolution Universe intermediate-lati…
Multi-wavelength Observations of the Radio Magnetar PSR J1622-4950 and Discovery of its Possibly Associated Supernova Remnant
Gemma E. Anderson, B. M. Gaensler, Patrick O. Slane +29
We present multi-wavelength observations of the radio magnetar PSR J1622-4950 and its environment. Observations of PSR J1622-4950 with Chandra (in 2007 and 2009) and XMM (in 2011)…
Accelerating incoherent dedispersion
Benjamin R. Barsdell, Matthew Bailes, David G. Barnes +1
Incoherent dedispersion is a computationally intensive problem that appears frequently in pulsar and transient astronomy. For current and future transient pipelines, dedispersion c…