Explanipedia

Lowering In-Memory Footprint of Antenna Beams via Polynomial Approximation Open

Ali Taqi, Karel Adámek, Quentin Gueuning, M. Serylak, Robert A. Laing , et al. · 2024

With the emergence of new radio telescopes promising larger fields of view at lower observation frequencies (e.g., SKA), addressing direction-dependent effects (DDE) (e.g., direction-specific beam responses), polarisation leakage, and poin…

PSR J1227–6208 and its massive white dwarf companion: Pulsar emission analysis, timing update, and mass measurements Open

M. C. i Bernadich, V. Venkatraman Krishnan, D. J. Champion, P. C. C. Freire, M. Kramer , et al. · 2024

MeerKAT observations of pair-plasma induced birefringence in the double pulsar eclipses Open

M. E. Lower, M. Krämer, S. Johnston, R. P. Breton, Norbert Wex , et al. · 2024

PSR J0737−3039A/B is unique among double neutron star systems. Its near-perfect edge-on orbit causes the fast spinning pulsar A to be eclipsed by the magnetic field of the slow spinning pulsar B. Using high-sensitivity MeerKAT radio observ…

Exploring the time variability of the solar wind using LOFAR pulsar data Open

S. C. Susarla, A. Chalumeau, C. Tiburzi, E. F. Keane, J. P. W. Verbiest , et al. · 2024

Context. High-precision pulsar timing is highly dependent on the precise and accurate modelling of any effects that can potentially impact the data. In particular, effects that contain stochastic elements contribute to some level of corrup…

PSR J1227-6208 and its massive white dwarf companion: Pulsar emission analysis, timing update, and mass measurements Open

M. C. i Bernadich, V. Venkatraman Krishnan, D. J. Champion, P. C. C. Freire, M. Kramer , et al. · 2024

PSR J1227$-$6208 is a 34.53-ms recycled pulsar with a massive companion. This system has long been suspected to belong to the emerging class of massive recycled pulsar$-$ONeMg white dwarf systems such as PSR J2222$-$0137, PSR J1528$-$3146,…

The Thousand-Pulsar-Array programme on MeerKAT – XIII. Timing, flux density, rotation measure, and dispersion measure time series of 597 pulsars Open

M. J. Keith, S. Johnston, A. Karastergiou, P. Weltevrede, M. E. Lower , et al. · 2024

We report here on the timing of 597 pulsars over the last four years with the MeerKAT telescope. We provide times of arrival, pulsar ephemeris files, and per-epoch measurements of the flux density, dispersion measure (DM), and rotation mea…

The MeerKAT 1.3 GHz Survey of the Small Magellanic Cloud Open

W. D. Cotton, M. D. Filipović, F. Camilo, R. Indebetouw, R. Z. E. Alsaberi , et al. · 2024

We present new radio continuum images and a source catalogue from the MeerKAT survey in the direction of the Small Magellanic Cloud. The observations, at a central frequency of 1.3 GHz across a bandwidth of 0.8 GHz, encompass a field of vi…

The MeerKAT 1.3 GHz Survey of the Small Magellanic Cloud Open

W. D. Cotton, M. D. Filipović, F. Camilo, R. Indebetouw, R. Z. E. Alsaberi , et al. · 2024

We present new radio continuum images and a source catalogue from the MeerKAT survey in the direction of the Small Magellanic Cloud (SMC). The observations, at a central frequency of 1.3 GHz across a bandwidth of 0.8 GHz, encompass a field…

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

C. Sobey, Neil J. Young, J. W. T. Hessels, P. Weltevrede, A. Noutsos , et al. · 2024

PSR B0823+26, a 0.53-s radio pulsar, displays a host of emission phenomena over time-scales of seconds to (at least) hours, including nulling, subpulse drifting, and mode-changing. Studying pulsars like PSR B0823+26 provides further insigh…

Constraining the magnetic field geometry of the millisecond pulsar PSR J0030+0451 from joint radio, thermal X-ray, andγ-ray emission Open

J. Pétri, Sébastien Guillot, L. Guillemot, I. Cognard, G. Theureau , et al. · 2023

Context. With the advent of multi-wavelength electromagnetic observations of neutron stars – spanning many decades in photon energies – from radio wavelengths up to X-rays and γ -rays, it has become possible to significantly constrain the …

Constraining the magnetic field geometry of the millisecond pulsar PSR~J0030+0451 from joint radio, thermal X-ray and $γ$-ray emission Open

J. Pétri, Sébastien Guillot, L. Guillemot, I. Cognard, G. Theureau , et al. · 2023

With the advent of multi-wavelength electromagnetic observations of neutron stars, spanning many decades in photon energies, from radio wavelengths up to X-rays and $γ$-rays, it becomes possible to significantly constrain the geometry and …

A sample of fast radio bursts discovered and localized with MeerTRAP at the MeerKAT telescope Open

F. Jankowski, M C Bezuidenhout, Manisha Caleb, Laura Driessen, Mateusz Malenta , et al. · 2023

We present a sample of well-localized fast radio bursts (FRBs) discovered by the MeerTRAP project at the MeerKAT telescope in South Africa. We discovered the three FRBs in single coherent tied-array beams and localized them to an area of ∼…

Pulsar scintillation studies with LOFAR: II. Dual-frequency scattering study of PSR J0826+2637 with LOFAR and NenuFAR Open

Ziwei Wu, W. A. Coles, J. P. W. Verbiest, M. A. Krishnakumar, C. Tiburzi , et al. · 2023

Interstellar scattering (ISS) of radio pulsar emission can be used as a probe of the ionized interstellar medium (IISM) and causes corruptions in pulsar timing experiments. Two types of ISS phenomena (intensity scintillation and pulse broa…

Pulsar Scintillation Studies with LOFAR: II. Dual-frequency scattering study of PSR J0826+2637 with LOFAR and NenuFAR Open

Ziwei Wu, William A. Coles, J. P. W. Verbiest, M. A. Krishnakumar, C. Tiburzi , et al. · 2023

Interstellar scattering (ISS) of radio pulsar emission can be used as a probe of the ionised interstellar medium (IISM) and causes corruptions in pulsar timing experiments. Two types of ISS phenomena (intensity scintillation and pulse broa…

PSR J1910–5959A: A rare gravitational laboratory for testing white dwarf models Open

A. Corongiu, V. Venkatraman Krishnan, P. C. C. Freire, M. Krämer, Andrea Possenti , et al. · 2023

Context. PSR J1910−5959A is a binary millisecond pulsar in a 0.837 day circular orbit around a helium white dwarf (HeWD) companion. The position of this pulsar is 6.3 arcmin (∼74 core radii) away from the optical centre of the globular clu…

The Thousand-Pulsar-Array programme on MeerKAT – VIII. The subpulse modulation of 1198 pulsars Open

X Song, P. Weltevrede, Andrzej Szary, G. A. E. Wright, M. J. Keith , et al. · 2023

We report on the subpulse modulation properties of 1198 pulsars using the Thousand-Pulsar-Array programme on MeerKAT. About 35 per cent of the analysed pulsars exhibit drifting subpulses that are more pronounced towards the death line, con…

The TRAPUM L-band survey for pulsars in Fermi-LAT gamma-ray sources Open

C. J. Clark, R. P. Breton, E D Barr, M. Burgay, T Thongmeearkom , et al. · 2023

More than 100 millisecond pulsars (MSPs) have been discovered in radio observations of gamma-ray sources detected by the Fermi Large Area Telescope (LAT), but hundreds of pulsar-like sources remain unidentified. Here, we present the first …

The Thousand-Pulsar-Array programme on MeerKAT - VIII. The subpulse modulation of 1198 pulsars Open

X Song, P. Weltevrede, Andrzej Szary, Geoffrey Wright, M. J. Keith , et al. · 2023

These datasets and document are online appendices beyond those provided in the main journal manuscript "The Thousand-Pulsar-Array programme on MeerKAT - VIII. The subpulse modulation of 1198 pulsars" by Song et al. published in Monthly Not…

The Thousand-Pulsar-Array programme on MeerKAT - VIII. The subpulse modulation of 1198 pulsars Open

X Song, P. Weltevrede, Andrzej Szary, Geoffrey Wright, M. J. Keith , et al. · 2023

These datasets and document are online appendices beyond those provided in the main journal manuscript "The Thousand-Pulsar-Array programme on MeerKAT - VIII. The subpulse modulation of 1198 pulsars" by Song et al. published in Monthly Not…

SKA Science Commissioning and Verification Plan Open

Shin’ichiro Asayama, Robert A. Laing, M. Serylak, J. L. Jonas · 2023

The Square Kilometre Array (SKA) [1] is a global project to build a next generation multi-purpose radio telescope that will play a major role in answering key questions in modern astrophysics and cosmology.The SKA is composed of two radio …

The MeerKAT Pulsar Timing Array: first data release Open

Matthew T. Miles, R. M. Shannon, M. Bailes, Daniel J. Reardon, M. J. Keith , et al. · 2022

We present the first 2.5 yr of data from the MeerKAT Pulsar Timing Array (MPTA), part of MeerTime, a MeerKAT Large Survey Project. The MPTA aims to precisely measure pulse arrival times from an ensemble of 88 pulsars visible from the South…

The LOFAR Tied-Array All-Sky Survey: Timing of 35 radio pulsars and an overview of the properties of the LOFAR pulsar discoveries Open

E. van der Wateren, C. Bassa, S. J. Cooper, J.‐M. Grießmeier, B. W. Stappers , et al. · 2022

The LOFAR Tied-Array All-Sky Survey (LOTAAS) is the most sensitive untargeted radio pulsar survey performed at low radio frequencies (119−151 MHz) to date and has discovered 76 new radio pulsars, including the 23.5-s pulsar J0250+5854, whi…

Gravitational signal propagation in the double pulsar studied with the MeerKAT telescope Open

H. Hu, M. Krämer, D. J. Champion, Norbert Wex, A. Parthasarathy , et al. · 2022

The double pulsar PSR J0737−3039A/B has offered a wealth of gravitational experiments in the strong-field regime, all of which general relativity has passed with flying colours. In particular, among current gravity experiments that test ph…

MeerTime MSP Census Open

R. Spiewak, M. Bailes, Matthew T. Miles, A. Parthasarathy, Daniel J. Reardon , et al. · 2022

Data table and PSRFITS-format files associated with Spiewak et al. 2022, "The MeerTime Pulsar Timing Array -- A Census of Emission Properties and Timing Potential" (doi:10.1017/pasa.2022.19). The zipped tar file contains one PSRFITS-format…

MeerTime MSP Census Open

R. Spiewak, M. Bailes, Matthew T. Miles, A. Parthasarathy, Daniel J. Reardon , et al. · 2022

Data table and PSRFITS-format files associated with Spiewak et al. 2022, "The MeerTime Pulsar Timing Array -- A Census of Emission Properties and Timing Potential" (doi:10.1017/pasa.2022.19). The zipped tar file contains one PSRFITS-format…

First discoveries and localizations of Fast Radio Bursts with MeerTRAP: real-time, commensal MeerKAT survey Open

Kaustubh Rajwade, M C Bezuidenhout, Manisha Caleb, Laura Driessen, F. Jankowski , et al. · 2022

We report on the discovery and localization of fast radio bursts (FRBs) from the MeerTRAP project, a commensal fast radio transient-detection programme at MeerKAT in South Africa. Our hybrid approach combines a coherent search with an aver…

The eccentric millisecond pulsar, PSR J0955−6150 Open

M. Serylak, V. Venkatraman Krishnan, P. C. C. Freire, Thomas M. Tauris, M. Krämer , et al. · 2022

Context. PSR J0955−6150 is a member of an enigmatic class of eccentric millisecond pulsar (MSP) and helium white dwarf (He WD) systems (eMSPs), whose binary evolution is poorly understood and believed to be strikingly different to that of …

Pulsar scintillation studies with LOFAR Open

Ziwei Wu, J. P. W. Verbiest, Robert Main, J.‐M. Grießmeier, Y. Liu , et al. · 2022

Context. Interstellar scintillation (ISS) of pulsar emission can be used both as a probe of the ionized interstellar medium (IISM) and cause corruptions in pulsar timing experiments. Of particular interest are so-called scintillation arcs …

TRAPUM discovery of 13 new pulsars in NGC 1851 using MeerKAT Open

A. Ridolfi, P. C. C. Freire, T. Gautam, S. M. Ransom, E D Barr , et al. · 2022

We report the discovery of 13 new pulsars in the globular cluster NGC 1851 by the TRAPUM Large Survey Project using the MeerKAT radio telescope. The discoveries consist of six isolated millisecond pulsars (MSPs) and seven binary pulsars, o…

Four pulsar discoveries in NGC 6624 by TRAPUM using MeerKAT Open

Federico Abbate, A. Ridolfi, E D Barr, S. Buchner, M. Burgay , et al. · 2022

We report four new pulsars discovered in the core-collapsed globular cluster (GC) NGC 6624 by the TRAPUM Large Survey Project with the MeerKAT telescope. All of the new pulsars found are isolated. PSR J1823−3021I and PSR J1823−3021K are mi…

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