Kinematics of Crab Giant Pulses

Bij, Akanksha; Lin, Hsiu-Hsien; Li, Dongzi; Kerkwijk, M. H. van; Pen, Ue-Li; Lu, W.; Main, Robert; Peterson, Jeffrey B.; Quine, Brendan M.; Vanderlinde, K.

doi:10.3847/1538-4357/ac1589

Cited by 14 publications

(12 citation statements)

References 43 publications

(51 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Section 7, we discuss the ramifications for the sizes of the emission regions and for the screen. We address the paradox of the resolved nanoshots and conclude it is most easily resolved if the plasma emitting the pulses moves highly relativistically, as has also been suggested by Bij et al (2021) based on drifting frequency structure in the scattering tail of giant pulses. We finish with an outlook in Section 8.…”

Section: Introductionmentioning

confidence: 66%

Resolving the Emission Regions of the Crab Pulsar’s Giant Pulses. II. Evidence for Relativistic Motion

Lin

Kerkwijk

Main

et al. 2023

ApJ

Self Cite

View full text Add to dashboard Cite

The Crab Pulsar is the prime example of an emitter of giant pulses. These short, very bright pulses are thought to originate near the light cylinder, at ∼1600 km from the pulsar. The pulsar’s location inside the Crab Nebula offers an unusual opportunity to resolve the emission regions, using the nebula, which scatters radio waves, as a lens. We attempt to do this using a sample of 61,998 giant pulses found in coherently combined European VLBI network observations at 18 cm. These were taken at times of relatively strong scattering and hence good effective resolution. From correlations between pulse spectra, we show that the giant pulse emission regions are indeed resolved. We infer apparent diameters of ∼2000 and ∼2400 km for the main and interpulse components, respectively, and show that with these sizes the correlation amplitudes and decorrelation timescales and bandwidths can be understood quantitatively, both in our observations and in previous ones. Using pulse-spectra statistics and correlations between polarizations, we also show that the nebula resolves the nanoshots that comprise individual giant pulses. The implied diameters of ∼1100 km far exceed light-travel-time estimates, suggesting the emitting plasma is moving relativistically, with γ ≃ 104, as inferred previously from drifting bands during the scattering tail of a giant pulse. If so, the emission happens over a region extended along the line of sight by ∼107 km. We conclude that relativistic motion likely is important for producing giant pulses, and may be similarly for other sources of short, bright radio emission, such as fast radio bursts.

show abstract

Section: Introductionmentioning

confidence: 66%

Resolving the Emission Regions of the Crab Pulsar’s Giant Pulses. II. Evidence for Relativistic Motion

Lin

Kerkwijk

Main

et al. 2023

ApJ

Self Cite

View full text Add to dashboard Cite

show abstract

“…At the same time, we continue to discover new emission phenomena from Galactic pulsars and magnetars (Bij et al 2021;Lower et al 2021). High-cadence observations of pulsar single pulses may reveal new phenomena that also give insight into FRBs.…”

Section: Linking To Other Observed Radio Phenomenamentioning

confidence: 92%

Fast radio bursts at the dawn of the 2020s

Petroff

Hessels

Lorimer

2022

Astron Astrophys Rev

139

View full text Add to dashboard Cite

Since the discovery of the first fast radio burst (FRB) in 2007, and their confirmation as an abundant extragalactic population in 2013, the study of these sources has expanded at an incredible rate. In our 2019 review on the subject, we presented a growing, but still mysterious, population of FRBs—60 unique sources, 2 repeating FRBs, and only 1 identified host galaxy. However, in only a few short years, new observations and discoveries have given us a wealth of information about these sources. The total FRB population now stands at over 600 published sources, 24 repeaters, and 19 host galaxies. Higher time resolution data, sustained monitoring, and precision localisations have given us insight into repeaters, host galaxies, burst morphology, source activity, progenitor models, and the use of FRBs as cosmological probes. The recent detection of a bright FRB-like burst from the Galactic magnetar SGR 1935 + 2154 provides an important link between FRBs and magnetars. There also continue to be surprising discoveries, like periodic modulation of activity from repeaters and the localisation of one FRB source to a relatively nearby globular cluster associated with the M81 galaxy. In this review, we summarise the exciting observational results from the past few years. We also highlight their impact on our understanding of the FRB population and proposed progenitor models. We build on the introduction to FRBs in our earlier review, update our readers on recent results, and discuss interesting avenues for exploration as the field enters a new regime where hundreds to thousands of new FRBs will be discovered and reported each year.

show abstract

“…Such temporal resolution is not required for routine observations of masers. Recently, however, equipment used to study pulsars and fast radio bursts has appeared, which has the required resolution (Bij 2021;Nimmo 2021). Apparently, the use of such or similar equipment makes it possible to experimentally measure the bunching parameter of masers.…”

Section: Measuring the Correlation Function For Maser Sources Discussionmentioning

confidence: 99%

Intensity correlation functions of microwave maser sources

Shepelev

2022

Publ. Astron. Soc. Aust.

View full text Add to dashboard Cite

Astrophysical sources of microwave radiation with extremely high spectral brightness are interpreted as masers. But by itself, the information about high brightness of radiation does not make it possible to establish whether the radiation is thermal or maser. This can be determined only on the basis of the analysis of high-order correlation functions. A possible measurement procedure for the second-order autocorrelation function (the bunching parameter) for these sources is proposed.

show abstract

Kinematics of Crab Giant Pulses

Cited by 14 publications

References 43 publications

Resolving the Emission Regions of the Crab Pulsar’s Giant Pulses. II. Evidence for Relativistic Motion

Resolving the Emission Regions of the Crab Pulsar’s Giant Pulses. II. Evidence for Relativistic Motion

Fast radio bursts at the dawn of the 2020s

Intensity correlation functions of microwave maser sources

Contact Info

Product

Resources

About