Simultaneous single-pulse observations of radio pulsars

ABSTRACT We report here on initial results from the Thousand-Pulsar-Array (TPA) programme, part of the Large Survey Project ‘MeerTime’ on the MeerKAT telescope. The interferometer is used in the tied-array mode in the band from 856 to 1712 MHz, and the wide band coupled with the large collecting area and low receiver temperature make it an excellent telescope for the study of radio pulsars. The TPA is a 5 year project, which aims at to observing (a) more than 1000 pulsars to obtain high-fidelity pulse profiles, (b) some 500 of these pulsars over multiple epochs, and (c) long sequences of single-pulse trains from several hundred pulsars. The scientific outcomes from the programme will include the determination of pulsar geometries, the location of the radio emission within the pulsar magnetosphere, the connection between the magnetosphere and the crust and core of the star, tighter constraints on the nature of the radio emission itself, as well as interstellar medium studies. First, results presented here include updated dispersion measures, 26 pulsars with Faraday rotation measures derived for the first time, and a description of interesting emission phenomena observed thus far.

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Organised polarisation variability in radio pulsars and consequences for emission theory

Proceedings of the International Astronomical Union ◽

10.1017/s1743921317009991 ◽

2017 ◽

Vol 13 (S337) ◽

pp. 79-82

Author(s):

Cristina-Diana Ilie ◽

Patrick Weltevrede

Keyword(s):

Radio Emission ◽

Single Pulse ◽

Position Angle ◽

Emission Mechanism ◽

Radio Pulsars ◽

High Quality ◽

Special Cases ◽

High Quality Sample ◽

Linear Polarisation ◽

Periodic Switching

AbstractThe aim of this work is to explore the connection between variability in single pulse intensity and periodic switching of the position angle (PA) of the linear polarisation and how this relates to the radio emission mechanism. There are five pulsars reported in the literature for which the PA is seen to periodically change in tandem with the variability in their pulse shapes. This behaviour is seemingly incompatible with two well established models of the radio emission mechanism. The purpose of this study is to investigate in a systematic way whether this phenomenon is common or if only happens in special cases, using a high-quality sample of pulsar data observed with the Parkes telescope. We show that the connection between polarisation variability and intensity variability is more common than previously expected.

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Simultaneous single-pulse observations of radio pulsars

Astronomy and Astrophysics ◽

10.1051/0004-6361:20030842 ◽

2003 ◽

Vol 407 (2) ◽

pp. 655-668 ◽

Cited By ~ 54

Author(s):

M. Kramer ◽

A. Karastergiou ◽

Y. Gupta ◽

S. Johnston ◽

N. D. R. Bhat ◽

...

Keyword(s):

Single Pulse ◽

Radio Pulsars

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Searches for Radio Pulsars & Fast Transients and Multiwavelength Studies of Single-pulse Emission

10.33915/etd.3657 ◽

2013 ◽

Author(s):

Mitchell B. Mickaliger

Keyword(s):

Single Pulse ◽

Radio Pulsars ◽

Pulse Emission ◽

Fast Transients

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Simultaneous single-pulse observations of radio pulsars

Astronomy and Astrophysics ◽

10.1051/0004-6361:20053157 ◽

2006 ◽

Vol 462 (1) ◽

pp. 257-268 ◽

Cited By ~ 25

Author(s):

N. D. R. Bhat ◽

Y. Gupta ◽

M. Kramer ◽

A. Karastergiou ◽

A. G. Lyne ◽

...

Keyword(s):

Single Pulse ◽

Radio Pulsars

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Initial results from a real-time FRB search with the GBT

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/staa1927 ◽

2020 ◽

Vol 497 (1) ◽

pp. 352-360 ◽

Cited By ~ 4

Author(s):

Devansh Agarwal ◽

D R Lorimer ◽

M P Surnis ◽

X Pei ◽

A Karastergiou ◽

...

Keyword(s):

Detection System ◽

Single Pulse ◽

Radio Pulsars ◽

Detection Rates ◽

Learning Classifier ◽

Count Distribution ◽

Peak Flux ◽

Noise Threshold ◽

Fast Radio Burst ◽

Initial Results

ABSTRACT We present the data analysis pipeline, commissioning observations, and initial results from the greenburst fast radio burst (FRB) detection system on the Robert C. Byrd Green Bank Telescope (GBT) previously described by Surnis et al., which uses the 21-cm receiver observing commensally with other projects. The pipeline makes use of a state-of-the-art deep learning classifier to winnow down the very large number of false-positive single-pulse candidates that mostly result from radio frequency interference. In our observations, totalling 156.5 d so far, we have detected individual pulses from 20 known radio pulsars that provide an excellent verification of the system performance. We also demonstrate, through blind injection analyses, that our pipeline is complete down to a signal-to-noise threshold of 12. Depending on the observing mode, this translates into peak flux sensitivities in the range 0.14–0.89 Jy. Although no FRBs have been detected to date, we have used our results to update the analysis of Lawrence et al. to constrain the FRB all-sky rate to be $1150^{+200}_{-180}$ per day above a peak flux density of 1 Jy. We also constrain the source count index α = 0.84 ± 0.06, which indicates that the source count distribution is substantially flatter than expected from a Euclidean distribution of standard candles (where α = 1.5). We discuss this result in the context of the FRB redshift and luminosity distributions. Finally, we make predictions for detection rates with greenburst, as well as other ongoing and planned FRB experiments.

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Radio Pulse Observations of Neutron Stars: A Review

Symposium - International Astronomical Union ◽

10.1017/s0074180900181239 ◽

2004 ◽

Vol 218 ◽

pp. 307-314

Author(s):

Yashwant Gupta

Keyword(s):

Neutron Star ◽

Neutron Stars ◽

Radio Pulse ◽

Single Pulse ◽

Radio Pulsars ◽

Giant Pulse ◽

Recent Advances ◽

Radio Signals

This paper presents a review of recent advances in those observations of radio pulsars which are relevant to the understanding of “where” and “how” the radio signals are generated in the magnetosphere of the neutron star. These include (i) results from simultaneous multi-frequency observations, (ii) emission geometry studies of multi-component pulsars, (iii) results from drifting and nulling pulsars, (iv) constraints from single pulse statistics and (v) progress in giant pulse studies.

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A GPU based single-pulse search pipeline (GSP) with database and its application to the Commensal Radio Astronomy FAST Survey (CRAFTS)

Research in Astronomy and Astrophysics ◽

10.1088/1674-4527/21/12/314 ◽

2022 ◽

Vol 21 (12) ◽

pp. 314

Author(s):

Shan-Ping You ◽

Pei Wang ◽

Xu-Hong Yu ◽

Xiao-Yao Xie ◽

Di Li ◽

...

Keyword(s):

Radio Astronomy ◽

Data Streams ◽

Single Pulse ◽

Wide Band ◽

Radio Bursts ◽

Learning Tools ◽

Radio Pulsars ◽

Real Time Processing ◽

Radio Transients ◽

Rotating Radio Transients

Abstract We developed a GPU based single-pulse search pipeline (GSP) with a candidate-archiving database. Largely based upon the infrastructure of the open source PulsaR Exploration and Search Toolkit (PRESTO), GSP implements GPU acceleration of the de-dispersion and integrates a candidate-archiving database. We applied GSP to the data streams from the Commensal Radio Astronomy FAST Survey (CRAFTS), which resulted in quasi-real-time processing. The integrated candidate database facilitates synergistic usage of multiple machine-learning tools and thus improves efficient identification of radio pulsars such as rotating radio transients (RRATs) and fast radio bursts (FRBs). We first tested GSP on pilot CRAFTS observations with the FAST Ultra-Wide Band (UWB) receiver. GSP detected all pulsars known from the the Parkes multibeam pulsar survey in the corresponding sky area covered by the FAST-UWB. GSP also discovered 13 new pulsars. We measured the computational efficiency of GSP to be ∼120 times faster than the original PRESTO and ∼60 times faster than an MPI-parallelized version of PRESTO.

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