scholarly journals A fast radio burst with a low dispersion measure

2018 ◽  
Author(s):  
E Petroff ◽  
L C Oostrum ◽  
B W Stappers ◽  
M Bailes ◽  
E D Barr ◽  
...  
Keyword(s):  
Radio Burst ◽  
Dispersion Measure ◽  
Fast Radio Burst ◽  
Low Dispersion

scholarly journals Fast radio burst dispersion measure distribution as a probe of helium reionization

2021 ◽  
Vol 103 (10) ◽  
Author(s):  
Mukul Bhattacharya ◽  
Pawan Kumar ◽  
Eric V. Linder
Keyword(s):  
Radio Burst ◽  
Dispersion Measure ◽  
Fast Radio Burst ◽  
Measure Distribution

scholarly journals The Northern Cross fast radio burst project – I. Overview and pilot observations at 408 MHz

2020 ◽  
Vol 494 (1) ◽  
pp. 1229-1236 ◽  
Author(s):  
Nicola T Locatelli ◽  
Gianni Bernardi ◽  
Germano Bianchi ◽  
Riccardo Chiello ◽  
Alessio Magro ◽  
...  
Keyword(s):  
Radio Burst ◽  
System Performance ◽  
Field Of View ◽  
High Dispersion ◽  
Dispersion Measure ◽  
Radio Bursts ◽  
Radio Telescopes ◽  
Present Test ◽  
New Radio ◽  
Fast Radio Burst

ABSTRACT Fast radio bursts (FRBs) remain one of the most enigmatic astrophysical sources. Observations have significantly progressed over the last few years, due to the capabilities of new radio telescopes and the refurbishment of existing ones. Here, we describe the upgrade of the Northern Cross radio telescope, operating in the 400–416 MHz frequency band, with the ultimate goal of turning the array into a dedicated instrument to survey the sky for FRBs. We present test observations of the pulsar B0329+54 to characterize the system performance and forecast detectability. Observations with the system currently in place are still limited by modest sky coverage (∼9.4 deg2) and biased by smearing of high dispersion measure events within each frequency channels. In its final, upgraded configuration, however, the telescope will be able to carry out unbiased FRB surveys over a ∼350 deg2 instantaneous field of view up to z ∼ 5, with a (nearly constant) $\sim 760 \, (\tau /{\rm ms})^{-0.5}$ mJy rms sensitivity.

scholarly journals Dispersion Measure Variation of Repeating Fast Radio Burst Sources

2017 ◽  
Vol 847 (1) ◽  
pp. 22 ◽  
Author(s):  
Yuan-Pei Yang ◽  
Bing Zhang
Keyword(s):  
Radio Burst ◽  
Dispersion Measure ◽  
Fast Radio Burst

scholarly journals Joint inference on the redshift distribution of fast radio burst and on the intergalactic baryon content

2020 ◽  
Author(s):  
S Hackstein ◽  
M Brüggen ◽  
F Vazza
Keyword(s):  
Radio Burst ◽  
Intergalactic Medium ◽  
Local Environment ◽  
Dispersion Measure ◽  
Selection Effects ◽  
Radio Bursts ◽  
Host Galaxies ◽  
Redshift Distribution ◽  
Joint Inference ◽  
Fast Radio Burst

Abstract Context: Fast radio bursts are transient radio pulses of extragalactic origin. Their dispersion measure is indicative of the baryon content in the ionized intergalactic medium between the source and the observer. However, inference using unlocalized fast radio bursts is degenerate to the distribution of redshifts of host galaxies. Method: We perform a joint inference of the intergalactic baryon content and the fast radio burst redshift distribution with the use of Bayesian statistics by comparing the likelihood of different models to reproduce the observed statistics in order to infer the most likely models. In addition to two models of the intergalactic medium, we consider contributions from the local environment of the source, assumed to be a magnetar, as well as a representative ensemble of host and intervening galaxies. Results: Assuming that the missing baryons reside in the ionized intergalactic medium, our results suggest that the redshift distribution of observed fast radio bursts peaks at z ≲ 0.6. However, conclusions from different instruments regarding the intergalactic baryon content diverge and thus require additional changes to the observed distribution of host redshifts, beyond those caused by telescope selection effects.

scholarly journals Imprint of local environment on fast radio burst observations

2020 ◽  
Vol 496 (3) ◽  
pp. 3308-3313 ◽  
Author(s):  
Wenbin Lu ◽  
E Sterl Phinney
Keyword(s):  
Radio Burst ◽  
Emission Measure ◽  
Low Frequency ◽  
Local Environment ◽  
Finite Amplitude ◽  
Dispersion Measure ◽  
Source Information ◽  
Coulomb Collisions ◽  
Fast Radio Burst ◽  
The Individual

ABSTRACT When fast radio burst (FRB) waves propagate through the local (${\lesssim}\rm 1\, pc$) environment of the FRB source, electrons in the plasma undergo large-amplitude oscillations. The finite-amplitude effects cause the effective plasma frequency and cyclotron frequency to be dependent on the wave strength. The dispersion measure and rotation measure should therefore vary slightly from burst to burst for a repeating source, depending on the luminosity and frequency of the individual burst. Furthermore, free–free absorption of strong waves is suppressed due to the accelerated electrons’ reduced energy exchange in Coulomb collisions. This allows bright low-frequency bursts to propagate through an environment that would be optically thick to low-amplitude waves. Given a large sample of bursts from a repeating source, it would be possible to use the deficit of low-frequency and low-luminosity bursts to infer the emission measure of the local intervening plasma and its distance from the source. Information about the local environment will shed light on the nature of FRB sources.

scholarly journals A search for fast-radio-burst-like emission from Fermi gamma-ray bursts

2020 ◽  
Vol 497 (1) ◽  
pp. 125-129 ◽  
Author(s):  
Mieke Bouwhuis ◽  
Keith W Bannister ◽  
Jean-Pierre Macquart ◽  
R M Shannon ◽  
David L Kaplan ◽  
...  
Keyword(s):  
Radio Emission ◽  
Radio Burst ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Dispersion Measure ◽  
Radio Bursts ◽  
Square Kilometre Array ◽  
Fast Radio Burst ◽  
Short Grbs

ABSTRACT We report the results of the rapid follow-up observations of gamma-ray bursts (GRBs) detected by the Fermi satellite to search for associated fast radio bursts. The observations were conducted with the Australian Square Kilometre Array Pathfinder at frequencies from 1.2 to 1.4 GHz. A set of 20 bursts, of which four were short GRBs, were followed up with a typical latency of about 1 min, for a duration of up to 11 h after the burst. The data were searched using 4096 dispersion measure trials up to a maximum dispersion measure of 3763 pc cm−3, and for pulse widths w over a range of duration from 1.256 to 40.48 ms. No associated pulsed radio emission was observed above $26 \, {\rm Jy\, ms}\, (w/1\, {\rm ms})^{-1/2}$ for any of the 20 GRBs.

Fast radio burst

AccessScience ◽  
2019 ◽  
Keyword(s):  
Radio Burst ◽  
Fast Radio Burst

A fast radio burst in our own Galaxy

Nature ◽  
2020 ◽  
Vol 587 (7832) ◽  
pp. 43-44
Author(s):  
Amanda Weltman ◽  
Anthony Walters
Keyword(s):  
Radio Burst ◽  
Fast Radio Burst

Astronomers spot first fast radio burst in the Milky Way

Nature ◽  
2020 ◽  
Vol 582 (7812) ◽  
pp. 322-323 ◽  
Author(s):  
Alexandra Witze
Keyword(s):  
Radio Burst ◽  
Milky Way ◽  
Fast Radio Burst
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