Observations of fast radio bursts at frequencies down to 400 megahertz

Chime,; Amiri, M.; Bandura, Kevin; Bhardwaj, Mohit; Boubel, Paula; Boyce, M. M.; Boyle, P. J.; Brar, Charanjot; Burhanpurkar, M.; Chawla, Pragya; Cliche, J. F.; Čubranić, Davor; Deng, Meiling; Denman, Nolan; Dobbs, M.; Fandino, Mateus; Fonseca, Emmanuel; Gaensler, B. M.; Gilbert, A.; Giri, Utkarsh; Good, Deborah C.; Halpern, M.; Hanna, D.; Hill, Alex S.; Hinshaw, G.; Höfer, Carolin; Josephy, Alexander; Kaspi, V. M.; Landecker, T. L.; Lang, Dustin; Masui, Kiyoshi; Mckinven, Ryan; Mena-Parra, Juan; Merryfield, Marcus; Milutinović, Nikola; Moatti, C.; Naidu, Arun; Newburgh, Laura; Ng, Cherry; Patel, C.; Pen, Ue-Li; Pinsonneault-Marotte, Tristan; Pleunis, Ziggy; Rafiei-Ravandi, Masoud; Ransom, S. M.; Rénard, A.; Scholz, Paul; Shaw, J. Richard; Siegel, Seth R.; Smith, Kendrick M.; Stairs, I. H.; Tendulkar, Shriharsh P.; Tretyakov, Ian; Vanderlinde, K.; Yadav, Prakarsh

doi:10.1038/s41586-018-0867-7

Cited by 199 publications

(87 citation statements)

References 42 publications

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“…the ratio between a given rate and the ideal rate -i.e., the rate 2 S ν ∝ ν −β , where S ν is the flux density at the frequency ν. unaffected by intra-channel smearing. We note that FRBs have a noticeable spectral modulation at low frequencies (CHIME/FRB Collaboration et al 2018Collaboration et al , 2019a, however, this effect is less prominent for the relatively narrow band of our observations, compared to wider bandwidth instruments. We expect a significant loss of events due to intra-channel smearing for the survey I, with a magnitude that depends upon the chosen FRB model.…”

Section: Frb Survey Designcontrasting

confidence: 60%

“…Initially, FRBs were detected at GHz frequencies (Lorimer et al 2007; Thornton et al 2013;Spitler et al 2014;Burke-Spolaor & Bannister 2014;Petroff et al 2015;Bhandari et al 2018;Patel et al 2018;Shannon et al 2018), but recent observations in the 400 − 800 MHz range have enormously increased the FRB statistics (e.g., Caleb et al 2016;CHIME/FRB Collaboration et al 2018, 2019a and placed increasingly better upper limits on their event rate In the foreground, the Northern Cross with its two orthogonal arms. (Sokolowski et al 2018;Sanidas et al 2019;ter Veen et al 2019), showing the advantage of large field of view (FoV) observations.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Locatelli

Bernardi

Bianchi

et al. 2020

Monthly Notices of the Royal Astronomical Society

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Fast radio bursts remain one of the most enigmatic astrophysical sources. Observations have significantly progressed over the last few years, thanks 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 fast radio bursts. 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 deg 2 ) 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 fast radio burst surveys over a ∼ 350 deg 2 instantaneous field of view up to z ∼ 5, with a (nearly constant) ∼ 760 (τ/ms) −0.5 mJy rms sensitivity.

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Section: Frb Survey Designcontrasting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

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

Locatelli

Bernardi

Bianchi

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…Energetically, such events are plausible sources for FRBs, and even short gamma-ray bursts, which would be unaccompanied by a kilonova. New observatories like CHIME [34], HIRAX [35], SKA [36], FAST [37], and others are rapidly increasing the number of observed FRBs, and providing crucial clues to their source(s). Upcoming radio surveys will also take a more accurate census of the pulsar population in the galactic core, which will place bounds on, or provide evidence for, the scenario studied here.…”

Section: Discussionmentioning

confidence: 99%

Fate of a neutron star with an endoparasitic black hole and implications for dark matter

East

Lehner

2019

Phys. Rev. D

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We study the dynamics and observational signatures of a neutron star being consumed by a much less massive black hole residing inside the star. This phenomenon could arise in a variety of scenarios, including after the capture of a primordial black hole, or in some models of asymmetric dark matter where the dark matter particles collect at the center of a neutron star and eventually collapse to form a black hole. However, the details of how the neutron star implodes are not well known, which is crucial to determining the observational implications of such events. We utilize fully general relativistic simulations to follow the evolution of such a black hole as it grows by several orders of magnitude, and ultimately consumes the neutron star. We consider a range of spin values for the neutron star, from non-rotating stars, to those with millisecond periods, as well as different equations of state. We find that as the black hole grows, it obtains a non-negligible spin and induces differential rotation in the core of the neutron star. In contrast to previous studies, we find that the amount of dynamical ejecta is very small, even for rapidly rotating stars, dampening the prospects for producing a kilonova-type electromagnetic signal from such events. We comment on other possible electromagnetic and gravitational signals.arXiv:1909.07968v1 [gr-qc]

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“…At extragalactic distances, potential transient sources at low frequencies include bright, coherent pulses predicted to accompany GRBs and neutron star mergers (see Anderson et al 2018, and references therein), as well as fast radio bursts (FRBs), highly dispersed millisecond pulses that have been detected at frequencies as low as 400 MHz (CHIME/FRB Collaboration et al 2019). The degree of scatter broadening from the current sample of FRBs indicates the potential for detecting this population even at very low frequencies (Ravi 2019).…”

Section: Introductionmentioning

confidence: 94%

New Limits on the Low-frequency Radio Transient Sky Using 31 hr of All-sky Data with the OVRO–LWA

Anderson

Hallinan

Eastwood

et al. 2019

ApJ

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We present the results of the first transient survey from the Owens Valley Radio Observatory Long Wavelength Array (OVRO-LWA) using 31 hr of data, in which we place the most constraining limits on the instantaneous transient surface density at timescales of 13 s to a few minutes and at frequencies below 100 MHz. The OVRO-LWA is a dipole array that images the entire viewable hemisphere with 58 MHz of bandwidth from 27 to 84 MHz at 13 s cadence. No transients are detected above a 6.5σ flux density limit of 10.5 Jy, implying an upper limit to the transient surface density of 2.5 × 10 −8 deg −2 at the shortest timescales probed, which is orders of magnitude deeper than has been achieved at sub-100 MHz frequencies and comparable flux densities to date. The nondetection of transients in the OVRO-LWA survey, particularly at minutes-long timescales, allows us to place further constraints on the rate of the potential population of transients uncovered by Stewart et al. 2016. From their transient rate, we expect a detection of 8.4 +31.8 −8.0 events, and the probability of our null detection is 1.9 +644 −1.9 × 10 −3 , ruling out a transient rate > 1.4 × 10 −4 days −1 deg −2 with 95% confidence at a flux density limit of 18.1 Jy, under the assumption of a flat spectrum and wide bandwidth. We discuss the implications of our nondetection for this population and further constraints that can be made on the source spectral index, intrinsic emission bandwidth, and resulting luminosity distribution.

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Observations of fast radio bursts at frequencies down to 400 megahertz

Cited by 199 publications

References 42 publications

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

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

Fate of a neutron star with an endoparasitic black hole and implications for dark matter

New Limits on the Low-frequency Radio Transient Sky Using 31 hr of All-sky Data with the OVRO–LWA

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