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

Bilous, A. V.; Grießmeier, Jean-Mathias; Pennucci, T. T.; Wu, Ziwei; Bondonneau, L.; Kondratiev, V. I.; Leeuwen, J. van; Maan, Yogesh; Connor, Liam; Oostrum, L. C.; Petroff, Emily; Verbiest, J. P. W.; Vohl, Dany; McKee, James W.; Shaifullah, G.; Theureau, G.; Ulyanov, O. M.; Cecconi, Baptiste; Coolen, A. H. W. M.; Corbel, S.; Damstra, S.; Dénes, H.; Girard, Julien N.; Hut, B.; Ivashina, Marianna; Konovalenko, O. O.; Kutkin, A. M.; Loose, G. M.; Mulder, H.; Ruiter, M.; Smits, R.; Tokarsky, P. L.; Vermaas, N. J.; Захаренко, В. В.; Zarka, Philippe; Ziemke, J.

doi:10.1051/0004-6361/202142242

Cited by 22 publications

(20 citation statements)

References 106 publications

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“…The limited window of measured dynamic spectra can cause large differences due to the small number of scintles, particularly at high observing frequencies for low DM pulsars. A clear discussion of this was recently published by Bilous et al (2022). 3.…”

Section: Determination Of αmentioning

confidence: 98%

Pulsar scintillation studies with LOFAR

Verbiest

Main

et al. 2022

A&A

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Context. Interstellar scintillation (ISS) of pulsar emission can be used both as a probe of the ionized interstellar medium (IISM) and cause corruptions in pulsar timing experiments. Of particular interest are so-called scintillation arcs which can be used to measure time-variable interstellar scattering delays directly, potentially allowing high-precision improvements to timing precision. Aims. The primary aim of this study is to carry out the first sizeable and self-consistent census of diffractive pulsar scintillation and scintillation-arc detectability at low frequencies, as a primer for larger-scale IISM studies and pulsar-timing related propagation studies with the LOw-Frequency ARray (LOFAR) High Band Antennae (HBA). Methods. We use observations from five international LOFAR stations and the LOFAR core in the Netherlands. We analyze the 2D auto-covariance function of the dynamic spectra of these observations to determine the characteristic bandwidth and timescale of the ISS toward the pulsars in our sample and investigate the 2D power spectra of the dynamic spectra to determine the presence of scintillation arcs. Results. In this initial set of 31 sources, 15 allow for the full determination of the scintillation properties; nine of these show detectable scintillation arcs at 120–180 MHz. Eight of the observed sources show unresolved scintillation; and the final eight do not display diffractive scintillation. Some correlation between scintillation detectability and pulsar brightness and a dispersion measure is apparent, although no clear cut-off values can be determined. Our measurements across a large fractional bandwidth allow a meaningful test of the frequency scaling of scintillation parameters, uncorrupted by influences from refractive scintillation variations. Conclusions. Our results indicate the powerful advantage and great potential of ISS studies at low frequencies and the complex dependence of scintillation detectability on parameters such as pulsar brightness and interstellar dispersion. This work provides the first installment of a larger-scale census and longer-term monitoring of ISS effects at low frequencies.

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Section: Determination Of αmentioning

confidence: 98%

Pulsar scintillation studies with LOFAR

Verbiest

Main

et al. 2022

A&A

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“…4). These are considered some of the predominant features of repeating FRBs ( 30 , 31 , 40 ), although some similar patterns have also been found from a small group of pulsars ( 41 ) in low frequencies. The resemblance between the single pulses of this FRB-generating magnetar and those of repeating FRBs indicates that the plasma responsible for the two types of coherent bursts might share some physical traits that are imprinted in the dynamic spectrum although the physical mechanism behind their creating might be completely different.…”

Section: Resultsmentioning

confidence: 56%

A radio pulsar phase from SGR J1935+2154 provides clues to the magnetar FRB mechanism

Zhu

Zhou

et al. 2023

Sci. Adv.

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The megajansky radio burst, FRB 20200428, and other bright radio bursts detected from the Galactic source SGR J1935+2154 suggest that magnetars can make fast radio bursts (FRBs), but the emission site and mechanism of FRB-like bursts are still unidentified. Here, we report the emergence of a radio pulsar phase of the magnetar 5 months after FRB 20200428. Pulses were detected in 16.5 hours over 13 days using the Five-hundred-meter Aperture Spherical radio Telescope, with luminosities of about eight decades fainter than FRB 20200428. The pulses were emitted in a narrow phase window anti-aligned with the x-ray pulsation profile observed using the x-ray telescopes. The bursts, conversely, appear in random phases. This dichotomy suggests that radio pulses originate from a fixed region within the magnetosphere, but bursts occur in random locations and are possibly associated with explosive events in a dynamically evolving magnetosphere. This picture reconciles the lack of periodicity in cosmological repeating FRBs within the magnetar engine model.

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“…However, the assumption of radiation altitude at 1000 km should be discussed carefully. In fact, the mean pulse profile at lower frequency is much wider, with pulse width ∼ 70 • (Bilous et al 2022), which leads to that the radiation altitude must be higher than 1500 km under the assumption of α ≃ 70 • . Furthermore, for the whole phase radiation, the maximum radiation altitude should be larger than 5000 km even after the adjustment for the effects of aberration and retardation.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

The radio signal of PSR B0950+08 is detected over the whole pulse phase

Wang¹,

Lu²,

Jiang³

et al. 2022

Preprint

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Pulsars, known as the "lighthouses" in the universe, are thought to emit periodic pulses with duty-cycle ∼ 10%. In this report, the 160 min-data of a nearby pulsar, PSR B0950+08, observed with the Five-hundred-meter Aperture Spherical radio Telescope (FAST) is analysed. Thanks to the extremely high sensitivity of FAST, it is found that the radiation of PSR B0950+08 could be detected over the entire pulse period. To investigate the radiative characteristics of the pulsar's bridge emission, a function, Θ(n), is defined to reveal the weak radiation there. It is suggested that the narrow peaks of both the main and the inter pulses could be radiated at low altitude, while other weak emission (e.g., the "bridges") from high magnetosphere far away from the surface though its radiative mechanism is still a matter of debate. The measured mean pulse behaviors are consistent with previous results in the phase of strong emission, and both the frequency-independent separation between the interpulse and main pulse and the narrow pulse width may support a double-pole model. Nonetheless, in order to finalize the magnetospheric geometry, further polarization observation with FAST is surely required, which would only be believable in the phase of weak emission if the baseline is determined with certainty in the future.

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

Cited by 22 publications

References 106 publications

Pulsar scintillation studies with LOFAR

Pulsar scintillation studies with LOFAR

A radio pulsar phase from SGR J1935+2154 provides clues to the magnetar FRB mechanism

The radio signal of PSR B0950+08 is detected over the whole pulse phase

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