Burst timescales and luminosities as links between young pulsars and fast radio bursts

Nimmo, K.; Hessels, J. W. T.; Kirsten, F.; Keimpema, A.; Cordes, J. M.; Snelders, M. P.; Hewitt, D. M.; Karuppusamy, R.; Archibald, Anne M.; Bezrukovs, Vl.; Bhardwaj, Mohit; Blaauw, R.; Buttaccio, S.; Cassanelli, Tomas; Conway, J.; Corongiu, A.; Feiler, R.; Fonseca, Emmanuel; Forssén, O.; Gawroński, M.; Giroletti, M.; Kharinov, M. A.; Leung, Calvin; Lindqvist, Michael; Maccaferri, G.; Marcote, B.; Masui, Kiyoshi; Mckinven, Ryan; Melnikov, Alexey; Michilli, D.; Mikhailov, Andrey; Ng, Cherry; Orbidans, A.; Ould-Boukattine, O. S.; Paragi, Z.; Pearlman, Aaron B.; Petroff, Emily; Rahman, Mubdi; Scholz, Paul; Shin, Kaitlyn; Smith, Kendrick M.; Stairs, I. H.; Surcis, G.; Tendulkar, Shriharsh P.; Vlemmings, Wouter; Wang, Na; Yang, Jun; Yuan, Jianping

doi:10.1038/s41550-021-01569-9

Cited by 61 publications

(63 citation statements)

References 73 publications

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“…Narrowband emissions or flux knots have now been observed in giant pulses of PSR J0540-6919 (Geyer et al 2021) and the Crab pulsar (Thulasiram & Lin 2021), which have been attributed to the intrinsic emission behavior of the source. Moreover, the discovery of a FRB in a globular cluster near M81 (Bhardwaj et al 2021;Kirsten et al 2022;Majid et al 2021) does put forward a strong case for the relationship between giant pulses and FRBs (Nimmo et al 2022). Another outburst comparable to FRB luminosity from a Galactic source will surely help us better constrain the energy gap between these two phenomena.…”

Section: Burst Energeticsmentioning

confidence: 94%

Multiband Detection of Repeating FRB 20180916B

Sand

Faber

Gajjar

et al. 2022

ApJ

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We present a multiband study of FRB 20180916B, a repeating source with a 16.3 day periodicity. We report the detection of four, one, and seven bursts from observations spanning 3 days using the upgraded Giant Metrewave Radio Telescope (300–500 MHz), the Canadian Hydrogen Intensity Mapping Experiment (400–800 MHz) and the Green Bank Telescope (600–1000 MHz), respectively. We report the first ever detection of the source in the 800–1000 MHz range along with one of the widest instantaneous bandwidth detections (200 MHz) at lower frequencies. We identify 30 μs wide structures in one of the bursts at 800 MHz, making it the lowest frequency detection of such structures for this fast radio burst thus far. There is also a clear indication of high activity of the source at a higher frequency during earlier phases of the activity cycle. We identify a gradual decrease in the rotation measure over two years and no significant variations in the dispersion measure. We derive useful conclusions about progenitor scenarios, energy distribution, emission mechanisms, and variation of the downward drift rate of emission with frequency. Our results reinforce that multiband observations are an effective approach to study repeaters, and even one-off events, to better understand their varying activity and spectral anomalies.

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Section: Burst Energeticsmentioning

confidence: 94%

Multiband Detection of Repeating FRB 20180916B

Sand

Faber

Gajjar

et al. 2022

ApJ

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“…f FRB source is associated with a globular cluster in the M81 system (Kirsten et al 2022) at a distance of 3.6 Mpc with a formally negative redshift. Measured scintillations are Galactic in origin and correspond to a scattering time of ∼27 ns (Nimmo et al 2022). Extragalactic scattering is not evident so we take 30 ns as an upper limit.…”

Section: Milky Way Contributionmentioning

confidence: 95%

“…A specific case is FRB 20200120E in a globular cluster near M81 that likely samples only the halos of M81 and the MW along with the MW disk components. Burst amplitude substructure is seen down to tens of microseconds (combined with shot pulses at the resolution limit of 31.25 ns) that shows no hint of scattering from outside the MW disk (Nimmo et al 2022).…”

Section: Scattering In Galaxy Halosmentioning

confidence: 99%

Redshift Estimation and Constraints on Intergalactic and Interstellar Media from Dispersion and Scattering of Fast Radio Bursts

Cordes

Ocker

Chatterjee

2022

ApJ

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A sample of 14 FRBs with measured redshifts and scattering times is used to assess contributions to dispersion and scattering from the intergalactic medium (IGM), galaxy halos, and the disks of host galaxies. The IGM and galaxy halos contribute significantly to dispersion measures (DMs) but evidently not to scattering, which is then dominated by host galaxies. This enables the usage of scattering times for estimating DM contributions from host galaxies and also for a combined scattering–dispersion redshift estimator. Redshift estimation is calibrated using the scattering of Galactic pulsars after taking into account different scattering geometries for Galactic and intergalactic lines of sight. The DM-only estimator has a bias of ∼0.1 and rms error of ∼0.15 in the redshift estimate for an assumed ad hoc value of 50 pc cm−3 for the host galaxy’s DM contribution. The combined redshift estimator shows less bias by a factor of 4 to 10 and a 20%–40% smaller rms error. We find that values for the baryonic fraction of the ionized IGM f igm ≃ 0.85 ± 0.05 optimize redshift estimation using dispersion and scattering. Our study suggests that 2 of the 14 candidate galaxy associations (FRB 20190523A and FRB 20190611B) should be reconsidered.

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“…One method of modifying pDM signals would be the use of extremely short pulses: the ASTROPULSE project searched for pulses of the order of 1 μs (Korpela et al 2009;von Korff 2010). However, as von Korff (2010) has suggested, other astrophysical sources are also known to emit such short pulses; FRBs have recently been shown to have submicrosecond structures (Majid et al 2021;Nimmo et al 2022). Another form of artificiality could be added by producing pDM signals exhibiting a repeating nonphysical sequence, for example, a Fibonacci series or fundamental frequency of any well-known element (Sullivan 1991).…”

Section: Artificially Dispersed Signalsmentioning

confidence: 99%

Searching for Broadband Pulsed Beacons from 1883 Stars Using Neural Networks

Gajjar

LeDuc

Chen

et al. 2022

ApJ

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The search for extraterrestrial intelligence at radio frequencies has largely been focused on continuous-wave narrowband signals. We demonstrate that broadband pulsed beacons are energetically efficient compared to narrowband beacons over longer operational timescales. Here, we report the first extensive survey searching for such broadband pulsed beacons toward 1883 stars as a part of the Breakthrough Listen’s search for advanced intelligent life. We conducted 233 hr of deep observations across 4–8 GHz using the Robert C. Byrd Green Bank Telescope and searched for three different classes of signals with artificial (or negative) dispersion. We report a detailed search—leveraging a convolutional neural network classifier on high-performance GPUs—deployed for the very first time in a large-scale search for signals from extraterrestrial intelligence. Due to the absence of any signal-of-interest from our survey, we place a constraint on the existence of broadband pulsed beacons in our solar neighborhood: ≲1 in 1000 stars have transmitter power densities ≳105 W Hz−1 repeating ≤500 s at these frequencies.

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Burst timescales and luminosities as links between young pulsars and fast radio bursts

Cited by 61 publications

References 73 publications

Multiband Detection of Repeating FRB 20180916B

Multiband Detection of Repeating FRB 20180916B

Redshift Estimation and Constraints on Intergalactic and Interstellar Media from Dispersion and Scattering of Fast Radio Bursts

Searching for Broadband Pulsed Beacons from 1883 Stars Using Neural Networks

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