M. J. Keith
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View article: Climate change adaptation in south Asian cities: A scoping review of literature from 2008 to 2022
Climate change adaptation in south Asian cities: A scoping review of literature from 2008 to 2022 Open
View article: A glitch in the millisecond pulsar J0900$-$3144
A glitch in the millisecond pulsar J0900$-$3144 Open
We report the detection of a glitch in the millisecond pulsar (MSP) PSR J0900$-$3144, which is included in the European, MeerKAT and Parkes pulsar timing array experiments. The dataset combines observations from the MeerKAT, Nançay, Lovell…
View article: TRAPUM search for pulsars in supernova remnants and pulsar wind nebulae – II. Survey analysis and population study
TRAPUM search for pulsars in supernova remnants and pulsar wind nebulae – II. Survey analysis and population study Open
We present the second and final set of TRAPUM searches for pulsars at 1284 MHz inside supernova remnants and pulsar wind nebulae with the MeerKAT telescope. No new pulsars were detected for any of the 80 targets, which include some unident…
View article: TRAPUM search for pulsars in supernova remnants and pulsar wind nebulae - II. Survey analysis and population study
TRAPUM search for pulsars in supernova remnants and pulsar wind nebulae - II. Survey analysis and population study Open
We present the second and final set of TRAPUM searches for pulsars at 1284 MHz inside supernova remnants and pulsar wind nebulae with the MeerKAT telescope. No new pulsars were detected for any of the 80 targets, which include some unident…
View article: The Thousand-Pulsar-Array programme on MeerKAT – XVIII. Complex sub-pulse modulation patterns, bi-drifting and mode changing of nine radio pulsars
The Thousand-Pulsar-Array programme on MeerKAT – XVIII. Complex sub-pulse modulation patterns, bi-drifting and mode changing of nine radio pulsars Open
We present a detailed analysis of sub-pulse modulations in nine pulsars, which show evidence of changes in sub-pulse drift direction as a function of pulse longitude in the Thousand Pulsar Array single pulse survey with MeerKAT. We confirm…
View article: Optimizing PHB recovery from Cupriavidus necator under mild acidic and alkaline digestion conditions
Optimizing PHB recovery from Cupriavidus necator under mild acidic and alkaline digestion conditions Open
View article: The Thousand-Pulsar-Array programme on MeerKAT -- XVIII. Complex sub-pulse modulation patterns, bi-drifting and mode changing of nine radio pulsars
The Thousand-Pulsar-Array programme on MeerKAT -- XVIII. Complex sub-pulse modulation patterns, bi-drifting and mode changing of nine radio pulsars Open
We present a detailed analysis of sub-pulse modulations in nine pulsars which show evidence of changes in sub-pulse drift direction as a function of pulse longitude in the Thousand Pulsar Array single pulse survey with MeerKAT. We confirm …
View article: Main and interpulse interaction in PSRs J1842+0358 and J1926+0737: evidence for interpole communication
Main and interpulse interaction in PSRs J1842+0358 and J1926+0737: evidence for interpole communication Open
Our understanding of the elusive radio-pulsar emission mechanism would be deepened by determining the locality of the emission. Pulsars in which the two poles interact can potentially help solve this challenge. We here report the discovery…
View article: Measuring pulsar profile variations with 2D Gaussian process regression
Measuring pulsar profile variations with 2D Gaussian process regression Open
Time-correlated variations in the pulse profiles of radio pulsars provide insights into changes in their magnetospheres. For a small number of pulsars (${\sim} 20$), these variations have been shown to correlate with spin-down rate. Many o…
View article: A 34 yr Timing Solution of the Redback Millisecond Pulsar Terzan 5A
A 34 yr Timing Solution of the Redback Millisecond Pulsar Terzan 5A Open
We present a 34 yr timing solution of the redback pulsar system Terzan 5A (Ter5A). Ter5A, also known as B1744−24A or J1748−2446A, has a 11.56 ms pulse period, a ~0.1 M ⊙ dwarf companion star, and an orbital period of 1.82 hr. Ter5A display…
View article: Observation of discontinuities in the periodic modulation of PSR B1828−11
Observation of discontinuities in the periodic modulation of PSR B1828−11 Open
PSR B1828–11 is a radio pulsar that undergoes periodic modulations (∼500 d) of its spin-down rate and beamwidth, providing a valuable opportunity to understand the rotational dynamics of neutron stars. The periodic modulations have previou…
View article: Searches for signatures of ultralight axion dark matter in polarimetry data of the European Pulsar Timing Array
Searches for signatures of ultralight axion dark matter in polarimetry data of the European Pulsar Timing Array Open
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…
View article: The Thousand-Pulsar-Array programme on MeerKAT XVII: Discovery of beating radio emission variability in PSR J1514-4834
The Thousand-Pulsar-Array programme on MeerKAT XVII: Discovery of beating radio emission variability in PSR J1514-4834 Open
We present a comprehensive analysis of the complex subpulse modulation patterns in PSR J1514-4834 (B1510-48) using L-band data from the Thousand-Pulsar-Array (TPA) programme, complemented with further MeerKAT UHF-band data. We demonstrate …
View article: The Thousand-Pulsar-Array programme on MeerKAT – XVII. Discovery of beating radio emission variability in PSR J1514−4834
The Thousand-Pulsar-Array programme on MeerKAT – XVII. Discovery of beating radio emission variability in PSR J1514−4834 Open
We present a comprehensive analysis of the complex subpulse modulation patterns in PSR J1514–4834 (B1510–48) using L-band data from the Thousand-Pulsar-Array (TPA) programme, complemented with further MeerKAT UHF-band data. We demonstrate …
View article: Tackling artefacts in the timing of relativistic pulsar binaries: Towards the SKA
Tackling artefacts in the timing of relativistic pulsar binaries: Towards the SKA Open
Common signal-processing approximations produce artefacts when timing pulsars in relativistic binary systems, especially edge-on systems with tight orbits, such as the Double Pulsar. In this paper, we use extensive simulations to explore v…
View article: Tackling artefacts in the timing of relativistic pulsar binaries: towards the SKA
Tackling artefacts in the timing of relativistic pulsar binaries: towards the SKA Open
Common signal-processing approximations produce artefacts when timing pulsars in relativistic binary systems, especially edge-on systems with tight orbits, such as the Double Pulsar. In this paper, we use extensive simulations to explore v…
View article: Observation of discontinuities in the periodic modulation of PSR B1828-11
Observation of discontinuities in the periodic modulation of PSR B1828-11 Open
PSR B1828-11 is a radio pulsar that undergoes periodic modulations (~500 days) of its spin-down rate and beam width, providing a valuable opportunity to understand the rotational dynamics of neutron stars. The periodic modulations have pre…
View article: Climate Change Adaptation in South Asian Cities: A Scoping Review of Literature from 2008 to 2022
Climate Change Adaptation in South Asian Cities: A Scoping Review of Literature from 2008 to 2022 Open
View article: The High Time Resolution Universe Pulsar Survey – XIX. A coherent GPU-accelerated reprocessing and the discovery of 71 pulsars in the Southern Galactic plane
The High Time Resolution Universe Pulsar Survey – XIX. A coherent GPU-accelerated reprocessing and the discovery of 71 pulsars in the Southern Galactic plane Open
We conducted a GPU-accelerated reprocessing of $\sim 87~{{\ \rm per\ cent}}$ of the archival data from the High Time Resolution Universe South Low Latitude (HTRU-S LowLat) pulsar survey by implementing a pulsar search pipeline that was pre…
View article: The impact on astrometry by solar-wind effect in pulsar timing
The impact on astrometry by solar-wind effect in pulsar timing Open
Astrometry of pulsars, particularly their distances, serves as a critical input for various astrophysical experiments using pulsars. Pulsar timing is a primary approach for determining a pulsar’s position, parallax, and distance. In this p…
View article: The impact on astrometry by solar-wind effect in pulsar timing
The impact on astrometry by solar-wind effect in pulsar timing Open
Astrometry of pulsars, particularly their distances, serves as a critical input for various astrophysical experiments using pulsars. Pulsar timing is a primary approach for determining a pulsar's position, parallax, and distance. In this p…
View article: The High Time Resolution Universe Pulsar Survey-XIX. A coherent GPU accelerated reprocessing and the discovery of 71 pulsars in the Southern Galactic plane
The High Time Resolution Universe Pulsar Survey-XIX. A coherent GPU accelerated reprocessing and the discovery of 71 pulsars in the Southern Galactic plane Open
We have conducted a GPU accelerated reprocessing of $\sim 87\%$ of the archival data from the High Time Resolution Universe South Low Latitude (HTRU-S LowLat) pulsar survey by implementing a pulsar search pipeline that was previously used …
View article: The MeerKAT Pulsar Timing Array: the first search for gravitational waves with the MeerKAT radio telescope
The MeerKAT Pulsar Timing Array: the first search for gravitational waves with the MeerKAT radio telescope Open
Pulsar timing arrays search for nanohertz-frequency gravitational waves by regularly observing ensembles of millisecond pulsars over many years to look for correlated timing residuals. Recently the first evidence for a stochastic gravitati…
View article: The MeerKAT Pulsar Timing Array: Maps of the gravitational wave sky with the 4.5-yr data release
The MeerKAT Pulsar Timing Array: Maps of the gravitational wave sky with the 4.5-yr data release Open
In an accompanying publication, the MeerKAT Pulsar Timing Array (MPTA) Collaboration reports tentative evidence for the presence of a stochastic gravitational wave background, following observations of similar signals from the European and…
View article: The MeerKAT Pulsar Timing Array: the 4.5-yr data release and the noise and stochastic signals of the millisecond pulsar population
The MeerKAT Pulsar Timing Array: the 4.5-yr data release and the noise and stochastic signals of the millisecond pulsar population Open
Pulsar timing arrays (PTAs) are ensembles of regularly observed millisecond pulsars timed to high precision. Each pulsar in an array could be affected by a suite of noise processes, most of which are astrophysically motivated. Analysing th…
View article: A 34 Yr Timing Solution of the Redback Millisecond Pulsar Terzan 5A
A 34 Yr Timing Solution of the Redback Millisecond Pulsar Terzan 5A Open
We present a 34-year timing solution of the redback pulsar system Terzan 5A (Ter5A). Ter5A, also known as B1744$-$24A or J1748$-$2446A, has a 11.56 ms pulse period, a $\sim$0.1 solar mass dwarf companion star, and an orbital period of 1.82…
View article: Exploring the time variability of the solar wind using LOFAR pulsar data
Exploring the time variability of the solar wind using LOFAR pulsar data Open
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…
View article: Periodicity search in the timing of the 25 millisecond pulsars from the second data release of the European Pulsar Timing Array
Periodicity search in the timing of the 25 millisecond pulsars from the second data release of the European Pulsar Timing Array Open
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…
View article: Eighteen new fast radio bursts in the High Time Resolution Universe survey
Eighteen new fast radio bursts in the High Time Resolution Universe survey Open
Current observational evidence reveals that fast radio bursts (FRBs) exhibit bandwidths ranging from a few dozen MHz to several GHz. Traditional FRB searches primarily employ matched filter methods on time series collapsed across the entir…
View article: Constraints on conformal ultralight dark matter couplings from the European Pulsar Timing Array
Constraints on conformal ultralight dark matter couplings from the European Pulsar Timing Array Open
Millisecond pulsars are extremely precise celestial clocks: as they rotate,\nthe beamed radio waves emitted along the axis of their magnetic field can be\ndetected with radio telescopes, which allows for tracking subtle changes in the\npul…