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It is widely accepted that dark matter contributes about a quarter of the critical mass-energy density in our Universe. The nature of dark matter is currently unknown, with the mass of possible constituents spanning nearly one hundred…

Traditional pulsar surveys have primarily employed time-domain periodicity searches. However, these methods are susceptible to effects like scattering, eclipses and orbital motion. At lower radio frequencies (<= 300 MHz), factors such as…

高能天体物理现象 · 物理学 2024-11-20 S. Sett , M. Sokolowski , E. Lenc , N. D. R. Bhat

We search for the isotropic stochastic gravitational-wave background, including the nontensorial polarizations that are allowed in general metric theories of gravity, in the Parkes Pulsar Timing Array (PPTA) second data release (DR2). We…

宇宙学与河外天体物理 · 物理学 2025-03-28 Yu-Mei Wu , Zu-Cheng Chen , Qing-Guo Huang

We report the discovery of two new millisecond pulsars (PSRs J0024$-$7204aa and J0024$-$7204ab) in the globular cluster 47\,Tucanae (NGC 104). Our results bring the total number of pulsars in 47\,Tucanae to 25. These pulsars were discovered…

高能天体物理现象 · 物理学 2016-03-23 Zhichen Pan , George Hobbs , Di Li , Alessandro Ridolfi , Pei Wang , Paulo Freire

We present the first 2.5 years 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…

Improving survey specifications are causing an exponential rise in pulsar candidate numbers and data volumes. We study the candidate filters used to mitigate these problems during the past fifty years. We find that some existing methods…

天体物理仪器与方法 · 物理学 2016-04-27 R. J. Lyon , B. W. Stappers , S. Cooper , J. M. Brooke , J. D. Knowles

We show the results of our analysis of the pulse broadening phenomenon in 25 pulsars at several frequencies using the data gathered with GMRT and Effelsberg radiotelescopes. Twenty two of these pulsars were not studied in that regard before…

高能天体物理现象 · 物理学 2015-06-16 Wojciech Lewandowski , Marta Dembska , Jaroslaw Kijak , Magdalena Kowalinska

In Paper I of this series, we detected a significant value of the braking index ($n$) for 19 young, high-$\dot{E}$ radio pulsars using $\sim$ 10 years of timing observations from the 64-m Parkes radio telescope. Here we investigate this…

We report the detection of pulse-to-pulse periodic intensity modulations, in observations of recycled pulsars. Even though the detection of individual pulses was generally not possible due to their low flux density and short duration,…

天体物理学 · 物理学 2009-11-07 R. T. Edwards , B. W. Stappers

Rotating Radio Transients (RRATs) represent a relatively new class of pulsar, primarily characterised by their sporadic bursting emission of single pulses on time scales of minutes to hours. In addition to the difficulty involved in…

高能天体物理现象 · 物理学 2019-09-11 B. W. Meyers , S. E. Tremblay , N. D. R. Bhat , R. M. Shannon , S. M. Ord , C. Sobey , M. Johnston-Hollitt , M. Walker , R. B. Wayth

Pulsar glitches are rapid spin-up events that occur in the rotation of neutron stars, providing a valuable probe into the physics of the interiors of these objects. Long-term monitoring of a large number of pulsars facilitates the detection…

The purpose of this paper is to suggest how detailed single-pulse observations of ``slow'' radio pulsars may be utilized to construct an empirical model for their emission. It links the observational synthesis developed in a series of…

天体物理学 · 物理学 2009-11-07 Joanna M. Rankin , Geoffrey A. E. Wright

This article is the second in the series that analyze about 1.87 million periods of Crab pulsar, observed by the PCA detector aboard the RXTE x-ray observatory. At these energies the pulsar displays none of the three phenomena that are…

天体物理学 · 物理学 2009-11-07 M. Vivekanand

Single pulses of pulsar radio emission are modeled as superposition of radiation originating from many small subsources that are randomly distributed in the emission region. The individual subsources are given an intrinsic finite angular…

天体物理学 · 物理学 2009-11-10 Qinghuan Luo

In an area of 3,300 square degrees, a search for pulsed dispersed signals using a neural network has been carried out. During the six-month observation period, pulses were detected from fifteen known pulsars as well as three new rotating…

高能天体物理现象 · 物理学 2025-08-18 I. V. Eldarov , S. A. Tyul'bashev , M. A. Kitaeva , G. E. Tyul'basheva

This papers searches for evidence of mass concentrations along the path of radio pulses in the IPTA survey data release. Radio pulse travel times are influenced via gravitational fields along the path from the source to the observer.…

星系天体物理 · 物理学 2025-03-14 John M. LoSecco

The search for pulsars in a sample of pulsar candidates found based on a multi-year survey conducted with low (6 channels; sampling 0.1s) time-frequency resolution on declinations -9^o < \delta < +42^o was carried out. A Large Phased Array…

高能天体物理现象 · 物理学 2022-10-26 S. A. Tyul'bashev , M. A. Kitaeva , G. E. Tyul'basheva

In this paper we demonstrate that a large, unexplored reservoir of information about pulsar emission exists, that is directly linked to the radiating particles and their radiation process: We present a study of flux density measurements of…

天体物理学 · 物理学 2009-11-10 M. Kramer , A. Karastergiou , Y. Gupta , S. Johnston , N. D. R. Bhat , A. G. Lyne

We summarize five years of continuous monitoring of accretion-powered pulsars with the Burst and Transient Source Experiment (BATSE) on the Compton Gamma Ray Observatory. Our 20-70 keV observations have determined or refined the orbital…