Detecting fast radio bursts at decametric wavelengths

Rajwade, Kaustubh; Lorimer, D. R.

doi:10.1093/mnras/stw2914

Cited by 24 publications

(33 citation statements)

References 37 publications

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“…The survey's limiting redshift and the corresponding upper limit on the volumetric rate can also be estimated following the method and assumptions detailed in Rajwade & Lorimer (2017). The rate estimate of 3.…”

Section: −3mentioning

confidence: 99%

“…In the absence of scattering and free-free absorption, positive spectral indices will be the sole reason for reduction of flux at low frequencies, and we can set E n µ ¢ n a ¢ . Mirroring the terminology used by Rajwade & Lorimer (2017), we will be referring to it as model A hereafter. For the model where scattering becomes important (model B), E n¢ gets reduced by a factor of t W 1 scatt i 2 + ( ) .…”

Section: Constant Comoving Number Density Distributionmentioning

confidence: 99%

“…We considered two models of free-free absorption: cold molecular clouds with ionization fronts (model C), and hot, ionized magnetar ejecta/circumburst medium (model D). The parameters T e and EM for these models have been adopted from Rajwade & Lorimer (2017) and are listed in Table 3. Models E and F mimic models C and D, respectively, but also account for scattering.…”

Section: Constant Comoving Number Density Distributionmentioning

confidence: 99%

“…If the repeating FRB121102 is not representative of the FRB population, i.e., not all FRBs are cosmological, then this assumption might not hold true. Other caveats associated with these constraints have been detailed in Rajwade & Lorimer (2017).…”

Section: Constant Comoving Number Density Distributionmentioning

confidence: 99%

“…With its large field of view and good sensitivity, CHIME is predicted to discover tens of FRBs per day Rajwade & Lorimer 2017) in its frequency range of 400-800 MHz. The GBNCC survey is thus well placed to determine the expected detection rate for the lower part of the CHIME band.…”

Section: Introductionmentioning

confidence: 99%

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A Search for Fast Radio Bursts with the GBNCC Pulsar Survey

Chawla

Kaspi

Josephy

et al. 2017

ApJ

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We report on a search for fast radio bursts (FRBs) with the Green Bank Northern Celestial Cap (GBNCC) Pulsar Survey at 350 MHz. Pointings amounting to a total on-sky time of 61 days were searched to a dispersion measure (DM) of 3000 pc cm −3 , while the rest (23 days; 29% of the total time) were searched to a DM of 500 pc cm −3 . No FRBs were detected in the pointings observed through 2016 May. We estimate a 95% confidence upper limit on the FRB rate of 3.6 10 3FRBs sky −1 day −1 above a peak flux density of 0.63 Jy at 350 MHz for an intrinsic pulse width of 5 ms. We place constraints on the spectral index α by running simulations for different astrophysical scenarios and cumulative flux density distributions. The nondetection with GBNCC is consistent with the 1.4 GHz rate reported for the Parkes surveys for α>+0.35 in the absence of scattering and free-free absorption and α>−0.3 in the presence of scattering, for a Euclidean flux distribution. The constraints imply that FRBs exhibit either a flat spectrum or a spectral turnover at frequencies above 400 MHz. These constraints also allow estimation of the number of bursts that can be detected with current and upcoming surveys. We predict that CHIME may detect anywhere from several to ∼50 FRBs per day (depending on model assumptions), making it well suited for interesting constraints on spectral index, the log N-log S slope, and pulse profile evolution across its bandwidth (400-800 MHz).

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Section: −3mentioning

confidence: 99%

Section: Constant Comoving Number Density Distributionmentioning

confidence: 99%

Section: Constant Comoving Number Density Distributionmentioning

confidence: 99%

Section: Constant Comoving Number Density Distributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Search for Fast Radio Bursts with the GBNCC Pulsar Survey

Chawla

Kaspi

Josephy

et al. 2017

ApJ

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Fast radio bursts

Petroff

Hessels

Lorimer

2019

Astron Astrophys Rev

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602

471

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The discovery of radio pulsars over a half century ago was a seminal moment in astronomy. It demonstrated the existence of neutron stars, gave a powerful observational tool to study them, and has allowed us to probe strong gravity, dense matter, and the interstellar medium. More recently, pulsar surveys have led to the serendipitous discovery of fast radio bursts (FRBs). While FRBs appear similar to the individual pulses from pulsars, their large dispersive delays suggest that they originate from far outside the Milky Way and hence are many ordersof-magnitude more luminous. While most FRBs appear to be one-off, perhaps cataclysmic events, two sources are now known to repeat and thus clearly have a longer-lived central engine. Beyond understanding how they are created, there is also the prospect of using FRBs -as with pulsars -to probe the extremes of the Universe as well as the otherwise invisible intervening medium. Such studies will be aided by the high implied all-sky event rate: there is a detectable FRB roughly once every minute occurring somewhere on the sky. The fact that less than a hundred FRB sources have been discovered in the last decade is largely due to the small fields-of-view of current radio telescopes. A new generation of wide-field instruments is now coming online, however, and these will be capable of detecting multiple FRBs per day. We are thus on the brink of further breakthroughs in the short-duration radio transient phase space, which will be critical for differentiating between the many proposed theories for the origin of FRBs. In this review, we give an observational and theoretical introduction at a level that is accessible to astronomers entering the field.

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Pulsar Science with the SKA

Keane

2017

Proc. IAU

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Detecting fast radio bursts at decametric wavelengths

Cited by 24 publications

References 37 publications

A Search for Fast Radio Bursts with the GBNCC Pulsar Survey

A Search for Fast Radio Bursts with the GBNCC Pulsar Survey

Fast radio bursts

Pulsar Science with the SKA

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