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An 86-GHz search for Pulsars in the Galactic Center with the Atacama Large Millimeter/submillimeter Array
Kuo Liu, Gregory Desvignes, Ralph P. Eatough +24
We report on the first pulsar and transient survey of the Galactic Center (GC) with the Atacama Large Millimeter/submillimeter Array (ALMA). The observations were conducted during…
Searching for pulsars in the Galactic Centre at 3 and 2 mm
Pablo Torne, Gregory Desvignes, Ralph Eatough +13
Pulsars in the Galactic centre promise to enable unparalleled tests of gravity theories and black hole physics and to serve as probes of the stellar formation history and evolution…
The Thousand-Pulsar-Array programme on MeerKAT -- V. Scattering analysis of single-component pulsars
L. S. Oswald, A. Karastergiou, B. Posselt +13
We have measured the scattering timescale, , and the scattering spectral index, , for 84 single-component pulsars. Observations were carried out with the MeerKAT telescope as…
Multi-frequency observations of SGR J1935+2154
M. Bailes, C. G. Bassa, G. Bernardi +54
Magnetars are a promising candidate for the origin of Fast Radio Bursts (FRBs). The detection of an extremely luminous radio burst from the Galactic magnetar SGR J1935+2154 on 2020…
Eight new millisecond pulsars from the first MeerKAT globular cluster census
A. Ridolfi, T. Gautam, P. C. C. Freire +24
We have used the central 44 antennas of the new 64-dish MeerKAT radio telescope array to conduct a deep search for new pulsars in the core of nine globular clusters. This has led t…
The Relativistic Binary Programme on MeerKAT: Science objectives and first results
M. Kramer, I. H. Stairs, V. Venkatraman Krishnan +35
We describe the ongoing Relativistic Binary programme (RelBin), a part of the MeerTime large survey project with the MeerKAT radio telescope. RelBin is primarily focused on observa…
Measurements of pulse jitter and single-pulse variability in millisecond pulsars using MeerKAT
A. Parthasarathy, M. Bailes, R. M. Shannon +18
Using the state-of-the-art SKA precursor, the MeerKAT radio telescope, we explore the limits to precision pulsar timing of millisecond pulsars achievable due to pulse stochasticity…
Understanding and improving the timing of PSR J0737-3039B
Aristeidis Noutsos, G. Desvignes, M. Kramer +11
The double pulsar (PSR J0737-3039A/B) provides some of the most stringent tests of general relativity (GR) and its alternatives. The success of this system in tests of GR is largel…
High-cadence observations and variable spin behaviour of magnetar Swift J1818.0-1607 after its outburst
David Champion, Ismael Cognard, Marilyn Cruces +17
We report on multi-frequency radio observations of the new magnetar Swift J1818.0-1607, following it for more than one month with high cadence. The observations commenced less than…
A Fast Radio Burst discovered in FAST drift scan survey
Weiwei Zhu, Di Li, Rui Luo +67
We report the discovery of a highly dispersed fast radio burst, FRB~181123, from an analysis of 1500~hr of drift-scan survey data taken using the Five-hundred-meter Aperture…
Timing stability of black widow pulsars
Ann-Sofie Bak Nielsen, Gemma H. Janssen, Golam Shaifullah +13
We study the timing stability of three black widow pulsars, both in terms of their long-term spin evolution and their shorter-term orbital stability. The erratic timing behaviour a…
First M87 Event Horizon Telescope Results and the Role of ALMA
Ciriaco Goddi, Geoff Crew, Violette Impellizzeri +41
In April 2019, the Event Horizon Telescope (EHT) collaboration revealed the first image of the candidate super-massive black hole (SMBH) at the centre of the giant elliptical galax…
On the beam properties of radio pulsars with interpulse emission
Simon Johnston, Michael Kramer
In the canonical picture of pulsars, radio emission arises from a narrow cone centered on the star's magnetic axis but many basic details remain unclear. We use high-quality polari…
Radio emission from a pulsar's magnetic pole revealed by general relativity
Gregory Desvignes, Michael Kramer, Kejia Lee +7
Binary pulsars are affected by general relativity (GR), causing the spin axes of each pulsar to precess. We present polarimetric radio observations of PSR J1906+0746 that demonstra…
On the usefulness of existing Solar-wind models for pulsar timing corrections
C. Tiburzi, J. P. W. Verbiest, G. M. Shaifullah +15
Dispersive delays due to the Solar wind introduce excess noise in high-precision pulsar timing experiments, and must be removed in order to achieve the accuracy needed to detect, e…
Simulations of imaging the event horizon of Sagittarius A* from space
Freek Roelofs, Heino Falcke, Christiaan Brinkerink +8
It has been proposed that Very Long Baseline Interferometry (VLBI) at sub-millimeter waves will allow us to image the shadow of the black hole in the center of our Milky Way, Sagit…
Relativistic spin precession in the binary PSR J11416545
V. Venkatraman Krishnan, M. Bailes, W. van Straten +5
PSR J11416545 is a precessing binary pulsar that has the rare potential to reveal the two-dimensional structure of a non-recycled pulsar emission cone. It has undergone $\sim 25…
Galactic Center Pulsars with the ngVLA
Geoffrey C. Bower, Shami Chatterjee, Jim Cordes +9
Pulsars in the Galactic Center (GC) are important probes of General Relativity, star formation, stellar dynamics, stellar evolution, and the interstellar medium. Despite years of s…
LOFAR discovery of a 23.5-second radio pulsar
C. M. Tan, C. G. Bassa, S. Cooper +16
We present the discovery of PSR J0250+5854, a radio pulsar with a spin period of 23.5 s. This is the slowest-spinning radio pulsar known. PSR J0250+5854 was discovered by the LOFAR…
Multifrequency behaviour of the anomalous events of PSR J0922+0638
G. Shaifullah, C. Tiburzi, S. Osłowski +10
PSR J0922+0638 (B0919+06) shows unexplained anomalous variations in the on-pulse phase, where the pulse appears to episodically move to an earlier longitude for a few tens of rotat…
Einstein@Home discovers a radio-quiet gamma-ray millisecond pulsar
C. J. Clark, H. J. Pletsch, J. Wu +18
Millisecond pulsars (MSPs) are old neutron stars that spin hundreds of times per second and appear to pulsate as their emission beams cross our line of sight. To date, radio pulsat…
A direct measurement of sense of rotation of PSR J07373039A
Nihan Pol, Maura McLaughlin, Michael Kramer +3
We apply the algorithm published by Liang et al. (2014) to describe the Double Pulsar system J07373039 and extract the sense of rotation of first born recycled pulsar PSR J0737$…
A Massive-born Neutron Star with a Massive White Dwarf Companion
Ismael Cognard, Paulo C. C. Freire, Lucas Guillemot +10
We report on the results of a 4-year timing campaign of PSR~J2222, a 2.44-day binary pulsar with a massive white dwarf (WD) companion, with the Nançay, Effelsberg and Lovell…
The discovery of two mildly-recycled binary pulsars in the Northern High Time Resolution Universe pulsar survey
M. Berezina, D. J. Champion, P. C. C. Freire +11
We report the discovery and the results of follow-up timing observations of PSR J2045+3633 and PSR J2053+4650, two binary pulsars found in the Northern High Time Resolution Univers…