The Effects of Plasma Lensing on the Inferred Dispersion Measures of Fast Radiobursts

Er, Xinzhong; Yang, Yuan-Pei; Rogers, Adam

doi:10.3847/1538-4357/ab66b1

Cited by 27 publications

(30 citation statements)

References 74 publications

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“…Moreover, plasma inhomogeneity can act as a lens and introduce time delays and magnifications (Clegg, Fey, & Lazio 1998;Pen & King 2012;Cordes et al 2017;Er, Yang, & Rogers 2020). A detailed comparison between gravitational lensing and plasma lensing has been given by Wagner & Er (2020).…”

Section: Discussionmentioning

confidence: 99%

FRBs Lensed by Point Masses I. Lens Mass Estimation for Doubly Imaged FRBs

Chen,

Shu,

Zheng

et al. 2021

Preprint

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Fast radio bursts (FRBs) are bright radio transient events with durations on the order of milliseconds. The majority of FRB sources discovered so far have a single peak, with the exception of a few showing multiple-peaked profiles, the origin of which is unknown. In this work, we show that the strong lensing effect of a point mass or a point mass + external shear on a single-peak FRB can produce double peaks (i.e. lensed images). In particular, the leading peak will always be more magnified and hence brighter than the trailing peak for a point-mass lens model, while the point-mass + external shear lens model can produce a less magnified leading peak. We find that, for a point-mass lens model, the combination of lens mass M and redshift z l in the form of M (1 + z l ) can be directly computed from two observables-the delayed time ∆t and the flux ratio of the leading peak to the trailing peak R. For a point-mass + external shear lens model, upper and lower limits in M (1 + z l ) can also be obtained from ∆t and R for a given external shear strength. In particular, tighter lens mass constraints can be achieved when the observed R is larger. Lastly, we show the process of constraining lens mass using the observed values of ∆t and R of two double-peaked FRB sources, i.e. FRB 121002 and FRB 130729, as references, although the double-peaked profiles are not necessarily caused by strong lensing.

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Section: Discussionmentioning

confidence: 99%

FRBs Lensed by Point Masses I. Lens Mass Estimation for Doubly Imaged FRBs

Chen,

Shu,

Zheng

et al. 2021

Preprint

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“…Assuming a one-dimension Gaussian lens, the influence of plasma lensing on FRB light curve and spectrum has been discussed [38]. Meanwhile, an additional frequencydependent delay of the arrival time is introduced and this effect should be corrected when inferring DM value [44]. The complex time-frequency pulse structure of FRB 20121102A might be explained by plasma lensing [59].…”

Section: Plasma Lensingmentioning

confidence: 99%

Fast Radio Bursts

Xiao¹,

Wang²,

Dai³

2022

Preprint

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The era of fast radio bursts (FRBs) was open in 2007, when a very bright radio pulse of unknown origin was discovered occasionally in the archival data of Parkes Telescope. Over the past fifteen years, this mysterious phenomenon have caught substantial attention among the scientific community and become one of the hottest topic in high-energy astrophysics. The total number of events has a dramatic increase to a few hundred recently, benefiting from new dedicated surveys and improved observational techniques. Our understanding of these bursts has been undergoing a revolutionary growth with observational breakthroughs announced consistently. In this chapter, we will give a comprehensive introduction of FRBs, including the latest progress. Starting from the basics, we will go through population study, inherent physical mechanism, and all the way to the application in cosmology. Plenty of open questions exist right now and there is more surprise to come in this active young field.

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“…Under these prerequisites, the pulsar Dispersion Measure (DM) gives a similar projected density and arrival time difference. Yet, such an approximation is only valid under the condition that the geometric time delay caused by the deflection angle is small compared with the dispersive delay caused by the DM (Er et al 2020).…”

Section: The Thin Lens Formalismmentioning

confidence: 99%

On the double-plane plasma lensing

Er,

Wagner,

Mao

2021

Preprint

Self Cite

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Plasma lensing is the refraction of low-frequency electromagnetic rays due to cold free electrons in the universe. For sources at a cosmological distance, there is observational evidence of elongated, complex plasma structures along the line of sight requiring a multi-lens-plane description. To investigate the limits of single-plane plasma lensing, we set up a double-plane lens with a projected Gaussian electron density in each lens plane. We compare double-plane scenarios with corresponding effective single-plane configurations. Our results show how double-plane lenses can be distinguished from single-plane lenses by observables, i.e. resolved multiple image positions, relative magnifications, time delays, and pulse shapes. For plasma lensing of fast radio bursts, the observed pulse shape may be dominated by the lensing effect, allowing us to neglect the intrinsic source pulse shape to distinguish different lensing configurations. The time-domain observables turn out to be the most salient features to tell multi-and single-plane lenses apart.

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The Effects of Plasma Lensing on the Inferred Dispersion Measures of Fast Radiobursts

Cited by 27 publications

References 74 publications

FRBs Lensed by Point Masses I. Lens Mass Estimation for Doubly Imaged FRBs

FRBs Lensed by Point Masses I. Lens Mass Estimation for Doubly Imaged FRBs

Fast Radio Bursts

On the double-plane plasma lensing

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