LOFAR radio search for single and periodic pulses from M 31

Leeuwen, J. van; Mikhailov, K.; Keane, E. F.; Coenen, T.; Connor, Liam; Kondratiev, V. I.; Michilli, D.; Sanidas, Sotiris

doi:10.1051/0004-6361/201937065

Cited by 22 publications

(13 citation statements)

References 47 publications

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“…It is interesting to note that no direct comparison can be made between VHF pulses observed in PSR B0950+08, and the classical GPs at the same frequencies. To our knowledge, only the Crab pulsar has individual GPs recorded below 200 MHz (Popov et al 2006;Eftekhari et al 2016;Karuppusamy et al 2012;van Leeuwen et al 2020), however scattering in the ISM precludes any studies of pulse structure at these frequencies. The rest of "classical" GP pulsars show similar or larger levels of scattering and are generally fainter than Crab GPs.…”

Section: Constraints On the Place Of Originmentioning

confidence: 99%

Dual-frequency single-pulse study of PSR B0950+08

Bilous

Grießmeier

Pennucci

et al. 2022

A&A

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PSR B0950+08 is a bright nonrecycled pulsar whose single-pulse fluence variability is reportedly large. Based on observations at two widely separated frequencies, 55 MHz (NenuFAR) and 1.4 GHz (Westerbork Synthesis Radio Telescope), we review the properties of these single pulses. We conclude that they are more similar to ordinary pulses of radio emission than to a special kind of short and bright giant pulses, observed from only a handful of pulsars. We argue that a temporal variation of the properties of the interstellar medium along the line of sight to this nearby pulsar, namely the fluctuating size of the decorrelation bandwidth of diffractive scintillation makes an important contribution to the observed single-pulse fluence variability. We further present interesting structures in the low-frequency single-pulse spectra that resemble the “sad trombones” seen in fast radio bursts (FRBs); although for PSR B0950+08 the upward frequency drift is also routinely present. We explain these spectral features with radius-to-frequency mapping, similar to the model developed by Wang et al. (2019, ApJ, 876, L15) for FRBs. Finally, we speculate that μs-scale fluence variability of the general pulsar population remains poorly known, and that its further study may bring important clues about the nature of FRBs.

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Section: Constraints On the Place Of Originmentioning

confidence: 99%

Dual-frequency single-pulse study of PSR B0950+08

Bilous

Grießmeier

Pennucci

et al. 2022

A&A

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“…Model II). In the Crab pulsar, one of the best-studied giant-pulse emitters, the measured indices range from about −1.3 to −2.0 (Bhat et al 2008;van Leeuwen et al 2020).…”

Section: Best Valuesmentioning

confidence: 99%

“…In recent years, a number of observatories have focussed on detecting larger numbers of FRBs and studying these in more detail to help solve some of the open questions listed above. These telescopes and surveys include the Australian Square Kilometre Array Pathfinder (ASKAP; Macquart et al 2010;Johnston et al 2007), the FRB survey on Canadian Hydrogen Intensity Mapping Experiment (CHIME/FRB; CHIME/FRB Collaboration et al 2018), and the Apertif survey at Westerbork (Maan & van Leeuwen 2017;van Leeuwen et al 2021). By now, over a hundred FRB detections have been made (Petroff & Yaron 2020).…”

Section: Introductionmentioning

confidence: 99%

Multi-dimensional population modelling using frbpoppy: Magnetars can produce the observed fast radio burst sky

Gardenier

Leeuwen

2021

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Fast radio bursts (FRBs) are energetic, short, bright transients that occur frequently over the entire radio sky. The observational challenges following from their fleeting, generally one-off nature have prevented the identification of the underlying sources producing the bursts. As the population of detected FRBs grows, the observed distributions of brightness, pulse width, and dispersion measure now begin to take shape. Meaningful direct interpretation of these distributions is, however, made impossible by the selection effects that telescope and search pipelines invariably imprint on each FRB survey. Here, we show that multi-dimensional FRB population synthesis can find a single, self-consistent population of FRB sources that can reproduce the real-life results of the major ongoing FRB surveys. This means that individual observed distributions can now be combined to derive the properties of the intrinsic FRB source population. The characteristics of our best-fit model for one-off FRBs agree with a population of magnetars. We extrapolated this model and predicted the number of FRBs future surveys will find. For surveys that have commenced, the method we present here can already determine the composition of the FRB source class, and potentially even its subpopulations.

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“…Initial analysis using the radiometer equation indicates a specific fluence of ∼ 200 kJy ms across the observed bandwidth. Which may be the brightest pulse ever observed for this pulsar at these frequencies (Karuppusamy et al 2012;Meyers et al 2017;Van Leeuwen et al 2020).…”

Section: Pulsarsmentioning

confidence: 80%

First results from the REAL-time Transient Acquisition backend (REALTA) at the Irish LOFAR station

Murphy

Callanan

McCauley

et al. 2021

A&A

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Modern radio interferometers such as the LOw Frequency ARray (LOFAR) are capable of producing data at hundreds of gigabits to terabits per second. This high data rate makes the analysis of radio data cumbersome and computationally expensive. While high performance computing facilities exist for large national and international facilities, that may not be the case for instruments operated by a single institution or a small consortium. Data rates for next generation radio telescopes are set to eclipse those currently in operation, hence local processing of data will become all the more important. Here, we introduce the REAL-time Transient Acquisition backend (REALTA), a computing backend at the Irish LOFAR station (I-LOFAR) which facilitates the recording of data in near real-time and post-processing. We also present first searches and scientific results of a number of radio phenomena observed by I-LOFAR and REALTA, including pulsars, fast radio bursts (FRBs), rotating radio transients (RRATs), the search for extraterrestrial intelligence (SETI), Jupiter, and the Sun.

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LOFAR radio search for single and periodic pulses from M 31

Cited by 22 publications

References 47 publications

Dual-frequency single-pulse study of PSR B0950+08

Dual-frequency single-pulse study of PSR B0950+08

Multi-dimensional population modelling using frbpoppy: Magnetars can produce the observed fast radio burst sky

First results from the REAL-time Transient Acquisition backend (REALTA) at the Irish LOFAR station

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