Explanipedia

Discovery of 30 Galactic radio transient pulsars with MeerTRAP Open

J Tian, S. Somorendro Singh, B. W. Stappers, John D. Turner, Kaustubh Rajwade , et al. · 2025

We present the discovery of 30 new Galactic sources from the MeerTRAP project, a commensal fast radio transient search programme using the MeerKAT telescope. These sources were all identified via a single-pulse search. Most of them are lik…

Discovery of 30 Galactic radio transient pulsars with MeerTRAP Open

Jun Tian, S. Somorendro Singh, B. W. Stappers, J. D. Turner, Kaustubh Rajwade , et al. · 2025

We present the discovery of 30 new Galactic sources from the MeerTRAP project, a commensal fast radio transient search programme using the MeerKAT telescope. These sources were all identified via a single pulse search. Most of them are lik…

Multiwavelength observations of a new black-widow millisecond pulsar PSR J1544−2555 Open

Sonia Díaz, T Thongmeearkom, A Phosrisom, R. P. Breton, M. Burgay , et al. · 2025

We report the discovery of a new black-widow millisecond pulsar, PSR J1544–2555, associated with the Fermi-Large Area Telescope (LAT) source 4FGL J1544.2–2554. Optical, radio, and gamma-ray observations confirmed its nature as a compact sp…

Multiwavelength observations of a new black-widow millisecond pulsar PSR J1544-2555 Open

Sonia Díaz, T Thongmeearkom, A Phosrisom, R. P. Breton, M. Burgay , et al. · 2025

We report the discovery of a new black-widow millisecond pulsar, PSR J1544-2555, associated with the Fermi-LAT source 4FGL J1544.2-2554. Optical, radio, and gamma-ray observations confirmed its nature as a compact spider binary system. Opt…

A milliarcsecond localization associates FRB 20190417A with a compact persistent radio source and an extreme magneto-ionic environment Open

Alexandra Moroianu, Shivani Bhandari, M. R. Drout, Jason W. T. Hessels, D. M. Hewitt , et al. · 2025

We report the milliarcsecond localization of a high (1379 pc/cc) dispersion measure (DM) repeating fast radio burst, FRB 20190417A. Combining European VLBI Network detections of five repeat bursts, we confirm the FRB's host to be a low-met…

Searches for signatures of ultralight axion dark matter in polarimetry data of the European Pulsar Timing Array Open

N. K. Porayko, P. Usynina, Jorge Terol-Calvo, Jorge Martin Camalich, G. Shaifullah , et al. · 2025

Ultralight axionlike particles (ALPs) can be a viable solution to the dark matter problem. The scalar field associated with ALPs, coupled to the electromagnetic field acts as an active birefringent medium, altering the polarization propert…

Enhanced License Plate Detection Via Vision Network Region Separation in Traffic Monitoring Open

Purushothaman Annadurai, R. Karuppusamy · 2025

Enhanced License Plate Detection via Vision Network Region Separation in Traffic Monitoring Open

Purushothaman Annadurai, R. Karuppusamy · 2025

Radio and gamma-ray timing of TRAPUM <i>L</i>-band <i>Fermi</i> pulsar survey discoveries Open

M. Burgay, L. Nieder, C. J. Clark, P. C. C. Freire, S. Buchner , et al. · 2024

This paper presents the results of a joint radio and gamma-ray timing campaign on the nine millisecond pulsars (MSPs) discovered as part of the L -band targeted survey of Fermi -LAT sources performed in the context of the Transients and Pu…

Periodicity search in the timing of the 25 millisecond pulsars from the second data release of the European Pulsar Timing Array Open

I. C. Niţu, M. J. Keith, D. J. Champion, I. Cognard, G. Desvignes , et al. · 2024

In this work, we investigated the presence of strictly periodic, as well as quasi-periodic signals, in the timing of the 25 millisecond pulsars (MSPs) from the European Pulsar Timing Array Second Data Release data set. This is especially i…

Periodicity search in the timing of the 25 millisecond pulsars from the second data release of the European Pulsar Timing Array Open

I. C. Niţu, M. J. Keith, D. J. Champion, I. Cognard, G. Desvignes , et al. · 2024

In this work, we investigated the presence of strictly periodic, as well as quasi-periodic signals, in the timing of the 25 millisecond pulsars from the EPTA DR2 dataset. This is especially interesting in the context of the recent hints of…

The second data release from the European Pulsar Timing Array Open

John Antoniadis, P. Arumugam, S. Arumugam, S. Babak, Manjari Bagchi , et al. · 2024

We present the results of a search for continuous gravitational wave signals (CGWs) in the second data release (DR2) of the European Pulsar Timing Array (EPTA) Collaboration. The most significant candidate event from this search has a grav…

Modeling nonstationary noise in pulsar timing array data analysis Open

M. Falxa, John Antoniadis, D. J. Champion, I. Cognard, G. Desvignes , et al. · 2024

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Modeling non stationary noise in pulsar timing array data analysis Open

M. Falxa, John Antoniadis, D. J. Champion, I. Cognard, G. Desvignes , et al. · 2024

Pulsar Timing Array (PTA) collaborations recently reported evidence for the presence of a gravitational wave background (GWB) in their datasets. The main candidate that is expected to produce such a GWB is the population of supermassive bl…

A freely precessing magnetar following an X-ray outburst Open

G. Desvignes, P. Weltevrede, Yong Gao, D. I. Jones, M. Krämer , et al. · 2024

The second data release from the European Pulsar Timing Array Open

John Antoniadis, P. Arumugam, S. Arumugam, S. Babak, Manjari Bagchi , et al. · 2024

The European Pulsar Timing Array (EPTA) and Indian Pulsar Timing Array (InPTA) collaborations have measured a low-frequency common signal in the combination of their second and first data releases, respectively, with the correlation proper…

Radio pulse profile evolution of magnetar Swift J1818.0−1607 Open

R. P. Fisher, E. M. Butterworth, Kaustubh Rajwade, B. W. Stappers, G. Desvignes , et al. · 2024

The shape and polarization properties of the radio pulse profiles of radio-loud magnetars provide a unique opportunity to investigate their magnetospheric properties. Gaussian process regression analysis was used to investigate the variati…

Radio Pulse Profile Evolution of Magnetar Swift J1818.0-1607 Open

Rebecca Fisher, E. M. Butterworth, Kaustubh Rajwade, B. W. Stappers, G. Desvignes , et al. · 2024

The shape and polarisation properties of the radio pulse profiles of radio-loud magnetars provide a unique opportunity to investigate their magnetospheric properties. Gaussian Process Regression analysis was used to investigate the variati…

A Gaussian-processes approach to fitting for time-variable spherical solar wind in pulsar timing data Open

I. C. Niţu, M. J. Keith, C. Tiburzi, M. Brüggen, D. J. Champion , et al. · 2024

Propagation effects are one of the main sources of noise in high-precision pulsar timing. For pulsars below an ecliptic latitude of 5°, the ionized plasma in the solar wind can introduce dispersive delays of order $100\, \mu \mathrm{s}$ ar…

A Gaussian-processes approach to fitting for time-variable spherical solar wind in pulsar timing data Open

I. C. Niţu, M. J. Keith, C. Tiburzi, M. Brüggen, D. J. Champion , et al. · 2024

Propagation effects are one of the main sources of noise in high-precision pulsar timing. For pulsars below an ecliptic latitude of $5^\circ$, the ionised plasma in the solar wind can introduce dispersive delays of order 100 microseconds a…

Giant pulses from the Crab pulsar: A wide-band study Open

R. Karuppusamy, B. W. Stappers, W. van Straten · 2024

The Crab pulsar is well-known for its anomalous giant radio pulse emission. Past studies have concentrated only on the very bright pulses or were insensitive to the faint end of the giant pulse luminosity distribution. With our new instrum…

Practical approaches to analyzing PTA data: Cosmic strings with six pulsars Open

Hippolyte Quelquejay Leclere, Pierre Auclair, S. Babak, A. Chalumeau, D. A. Steer , et al. · 2023

We search for a stochastic gravitational wave background (SGWB) generated by a network of cosmic strings using six millisecond pulsars from Data Release 2 (DR2) of the European Pulsar Timing Array (EPTA). We perform a Bayesian analysis con…

A Search for Pulsars around Sgr A* in the First Event Horizon Telescope Data Set Open

Pablo Torné, Kuo Liu, Ralph P. Eatough, J. Wongphechauxsorn, J. M. Cordes , et al. · 2023

In 2017 the Event Horizon Telescope (EHT) observed the supermassive black hole at the center of the Milky Way, Sagittarius A* (Sgr A*), at a frequency of 228.1 GHz ( λ = 1.3 mm). The fundamental physics tests that even a single pulsar orbi…

Quasi-periodic sub-pulse structure as a unifying feature for radio-emitting neutron stars Open

M. Krämer, Kuo Liu, G. Desvignes, R. Karuppusamy, B. W. Stappers · 2023

Second Data Release from the European Pulsar Timing Array: Challenging the Ultralight Dark Matter Paradigm Open

Clemente Smarra, B. Goncharov, Enrico Barausse, John Antoniadis, S. Babak , et al. · 2023

Pulsar Timing Array experiments probe the presence of possible scalar or pseudoscalar ultralight dark matter particles through decade-long timing of an ensemble of galactic millisecond radio pulsars. With the second data release of the Eur…

A search for pulsars around Sgr A* in the first Event Horizon Telescope dataset Open

Pablo Torné, Kuo Liu, Ralph P. Eatough, J. Wongphechauxsorn, J. M. Cordes , et al. · 2023

The Event Horizon Telescope (EHT) observed in 2017 the supermassive black hole at the center of the Milky Way, Sagittarius A* (Sgr A*), at a frequency of 228.1 GHz ($λ$=1.3 mm). The fundamental physics tests that even a single pulsar orbit…

Rotation measure variations in Galactic Centre pulsars Open

Federico Abbate, A. Noutsos, G. Desvignes, Robert Wharton, Pablo Torné , et al. · 2023

We report the results of an observational campaign using the Effelsberg 100-m telescope of the pulsars J1746−2849, J1746−2850, J1746−2856, and J1745−2912 located in the central molecular zone (CMZ) close to the Galactic Centre in order to …

Variable scintillation arcs of millisecond pulsars observed with the Large European Array for Pulsars Open

Robert Main, John Antoniadis, Siyuan Chen, I. Cognard, H. Hu , et al. · 2023

We present the first large sample of scintillation arcs in millisecond pulsars (MSPs), analysing 12 sources observed with the Large European Array for Pulsars (LEAP), and the Effelsberg 100-m telescope. We estimate the delays from multipat…

Rotation measure variations in Galactic Centre pulsars Open

F. Abbate, A. Noutsos, G. Desvignes, Robert Wharton, Pablo Torné , et al. · 2023

We report the results of an observational campaign using the Effelsberg 100-m telescope of the pulsars J1746$-$2849, J1746$-$2850, J1746$-$2856 and J1745$-$2912 located in the Central Molecular Zone (CMZ) close to the Galactic centre in or…

The second data release from the European Pulsar Timing Array Open

John Antoniadis, P. Arumugam, S. Arumugam, S. Babak, Manjari Bagchi , et al. · 2023

Aims. The nanohertz gravitational wave background (GWB) is expected to be an aggregate signal of an ensemble of gravitational waves emitted predominantly by a large population of coalescing supermassive black hole binaries in the centres o…

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