Mode Changing and Giant Pulses in the Millisecond Pulsar PSR B1957+20

Mahajan, Nikhil; Kerkwijk, M. H. van; Main, Robert; Pen, Ue-Li

doi:10.3847/2041-8213/aae713

Cited by 42 publications

(29 citation statements)

References 19 publications

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“…Figure 13 plots fluence distribution for both MP and IP GPs. Mahajan et al (2018) observed the original Black Widow Pulsar B1957+20 in 311. 25-359.25 ṀHz frequency range at the Arecibo Observatory.…”

Section: Appendix A: Details On Fluence Distributions From the Litera...mentioning

confidence: 99%

Dual-frequency single-pulse study of PSR B0950+08

Bilous

Grießmeier

Pennucci

et al. 2022

A&A

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PSR B0950+08 is a bright nonrecycled pulsar whose single-pulse fluence variability is reportedly large. Based on observations at two widely separated frequencies, 55 MHz (NenuFAR) and 1.4 GHz (Westerbork Synthesis Radio Telescope), we review the properties of these single pulses. We conclude that they are more similar to ordinary pulses of radio emission than to a special kind of short and bright giant pulses, observed from only a handful of pulsars. We argue that a temporal variation of the properties of the interstellar medium along the line of sight to this nearby pulsar, namely the fluctuating size of the decorrelation bandwidth of diffractive scintillation makes an important contribution to the observed single-pulse fluence variability. We further present interesting structures in the low-frequency single-pulse spectra that resemble the “sad trombones” seen in fast radio bursts (FRBs); although for PSR B0950+08 the upward frequency drift is also routinely present. We explain these spectral features with radius-to-frequency mapping, similar to the model developed by Wang et al. (2019, ApJ, 876, L15) for FRBs. Finally, we speculate that μs-scale fluence variability of the general pulsar population remains poorly known, and that its further study may bring important clues about the nature of FRBs.

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Section: Appendix A: Details On Fluence Distributions From the Litera...mentioning

confidence: 99%

Dual-frequency single-pulse study of PSR B0950+08

Bilous

Grießmeier

Pennucci

et al. 2022

A&A

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“…While common in slow pulsars, phenomena similar to mode changes have been reported in only two millisecond pulsars till date. A periodic change in the profile over a timescale of about 2 s was reported for the first-detected black widow pulsar, PSR B1957+20 (Mahajan et al 2018). A distinct profile change was reported in PSR J1643−1224 around MJD 57074 by Shannon et al (2016), which introduced systematics in the timing residuals of this pulsar at 10 cm and 20 cm bands.…”

Section: Introductionmentioning

confidence: 78%

Evidence for profile changes in PSR J1713+0747 using the uGMRT

Singha,

Surnis,

Joshi

et al. 2021

Preprint

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PSR J1713+0747 is one of the most precisely timed pulsars in the international pulsar timing array experiment. This pulsar showed an abrupt profile shape change between April 16, 2021 (MJD 59320) and April 17, 2021 (MJD 59321). In this paper, we report the results from multi-frequency observations of this pulsar carried out with the upgraded Giant Metrewave Radio Telescope (uGMRT) before and after the event. We demonstrate the profile change seen in Band 5 (1260 MHz -1460 MHz) and Band 3 (300 MHz -500 MHz). The timing analysis of this pulsar shows a disturbance accompanying this profile change followed by a recovery with a timescale of ∼ 140 days. Our data suggest that an achromatic exponential dip model is preferred over models with an inverse square or inverse quartic frequency dependence in Band 5.

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“…Thus GReX should detect some of the brightest super-giant pulses from Crab-like pulsars in our Galaxy and nearby. It is also salient that some GRP-emitting pulsars exhibit a "kink" in their energy distribution, such that the powerlaw N (> F th ) flattens in the high-energy tail, making ultra-bright bursts more common (Mahajan et al 2018).…”

Section: Galactic Magnetarsmentioning

confidence: 99%

Galactic Radio Explorer: An All-sky Monitor for Bright Radio Bursts

Connor

Shila

Kulkarni

et al. 2021

PASP

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We present the Galactic Radio Explorer (GReX), an all-sky monitor to probe the brightest bursts in the radio sky. Building on the success of STARE2, we will search for fast radio bursts (FRBs) emitted from Galactic magnetars as well as bursts from nearby galaxies. GReX will search down to ∼ ten microseconds time resolution, allowing us to find new super giant radio pulses from Milky Way pulsars and study their broadband emission. The proposed instrument will employ ultra-wide band (0.7-2 GHz) feeds coupled to a high performance (receiver temperature < 10 K) low noise amplifier (LNA) originally developed for the DSA-110 and DSA-2000 projects. In GReX Phase I (GReX-I), unit systems will be deployed at Owens Valley Radio Observatory (OVRO), NASA's Goldstone station, and at Telescope Array, Delta Utah. Phase II will expand the array, placing feeds in India, Australia, and elsewhere in order to build up to continuous coverage of nearly 4π steradians and to increase our exposure to the Galactic plane. We model the local magnetar population to forecast for GReX, finding the improved sensitivity and increased exposure to the Galactic plane could lead to dozens of FRB-like bursts per year.

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Mode Changing and Giant Pulses in the Millisecond Pulsar PSR B1957+20

Cited by 42 publications

References 19 publications

Dual-frequency single-pulse study of PSR B0950+08

Dual-frequency single-pulse study of PSR B0950+08

Evidence for profile changes in PSR J1713+0747 using the uGMRT

Galactic Radio Explorer: An All-sky Monitor for Bright Radio Bursts

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