Periodic Q-mode modulation in PSR J1825−0935 (PSR B1822−09)

Yan, W. M.; Manchester, R. N.; Wang, Na; Yuan, Jianping; Wen, Z. G.; Lee, K. J.

doi:10.1093/mnras/stz650

Cited by 23 publications

(19 citation statements)

References 44 publications

(74 reference statements)

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“…The magnetic field decay occurring in pulsars (especially in magnetars) has been confirmed by a series of theoretical and observational studies (Kaspi & Beloborodov 2017). The MDR model allows a change in magnetic moment M and/or a change in the angle α of a pulsar; the latter is usually companied with a change in pulse profiles (Wen et al 2016a, 2016b, 2020; Yan et al 2019, 2020; Zhao et al 2020). If the changes of M and α are considered simultaneously, the observed braking index n obs is obtained as

n_{normalobs} = 3 + \frac{2 Ω}{\overset{Ω}{true}} (\frac{\overset{α}{true}}{\tan α} + \frac{\overset{M}{true}}{M})

from Equation (18) and Equation (19), where

\dot{α}

is the derivative of α , and

\dot{M}

is the derivative of M .…”

Section: Two Work In Progressmentioning

confidence: 99%

The dissipation of toroidal magnetic fields and spin‐down evolution of young and strongly magnetized pulsars

2021

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Magnetars are a kind of pulsars powered mainly by superhigh magnetic fields. They are popular sources with many unsolved issues in themselves but are also linked to various high-energy phenomena, such as quasi periodic oscillations (QPOs), giant flares, fast radio bursts, and superluminous supernovae. In this work, we first review our recent works on the dissipation of toroidal magnetic fields in magnetars and rotationally powered pulsars and then review the spin-down evolution of young and strongly magnetized pulsars, especially of magnetars. We present an interesting and important relation between the magnetization parameter and magnetic field in the magnetar crust. Finally, we introduce our two works in progress: to explain the magnetar "antiglitch" events in the thermal plastic flow model and to revisit the expression of braking index n, which is independent of the second derivative of spin frequency of a pulsar, and give some proposals for our future work.

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n_{normalobs} = 3 + \frac{2 Ω}{\overset{Ω}{true}} (\frac{\overset{α}{true}}{\tan α} + \frac{\overset{M}{true}}{M})

from Equation (18) and Equation (19), where

\dot{α}

is the derivative of α , and

\dot{M}

is the derivative of M .…”

Section: Two Work In Progressmentioning

confidence: 99%

The dissipation of toroidal magnetic fields and spin‐down evolution of young and strongly magnetized pulsars

2021

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“…In a recent work by Basu & Mitra (2019), the periodic amplitude modulation has also been seen in the core single pulsar PSR J0826+2637. A periodic phase-stationary intensity modulation occurring in the interpulse and the main pulse was observed in PSR J1825−0935 (Fowler & Wright 1982;Gil et al 1994;Backus et al 2010;Latham et al 2012;Hermsen et al 2017;Yan et al 2019). Similar to PSR J1048−5832, the main pulse of PSR J1825−0935 is partially modulated with an unmodulated trailing component.…”

Section: Discussionmentioning

confidence: 99%

Periodic mode changing in PSR J1048−5832

Yan

Manchester

Wang

et al. 2019

Monthly Notices of the Royal Astronomical Society

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By analysing the data acquired from the Parkes 64-m radio telescope at 1369 MHz, we report on the phase-stationary non-drift amplitude modulation observed in PSR J1048−5832. The high-sensitivity observations revealed that the central and trailing components of the pulse profile of this pulsar switch between a strong mode and a weak mode periodically. However, the leading component remains unchanged. Polarization properties of the strong and weak modes are investigated. Considering the similarity to mode changing, we argue that the periodic amplitude modulation in PSR J1048−5832 is periodic mode changing. The fluctuation spectral analysis showed that the modulation period is very short (∼2.1 s or 17P 1 ), where P 1 is the rotation period of the pulsar. We find that this periodic amplitude modulation is hard to explain by existing models that account for the periodic phenomena in pulsars like subpulse drifting.

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“…Periodic nulling has been observed in many pulsars (Herfindal & Rankin 2007, 2009Rankin & Wright 2008;Rankin et al 2013;Gajjar et al 2014Gajjar et al , 2017Basu et al 2017;Basu & Mitra 2018;Basu et al 2019b;Basu & Mitra 2019). Recently, periodic mode changing also has been reported in some pulsars (Mitra & Rankin 2017;Basu & Mitra 2019;Yan et al 2019Yan et al , 2020.…”

Section: Introductionmentioning

confidence: 94%

Nulling and subpulse drifting in PSR J1727-2739

Rejep,

Wang,

Yan

et al. 2021

Preprint

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In this paper, we investigate the emission properties of PSR J1727−2739, whose mean pulse profile has two main components, by analysing five single-pulse observations made using the Parkes 64-m radio telescope with a central frequency of 1369 MHz between 2014 April and October. The total observation time is about 6.1 hours which contains 16718 pulses after removal of radio frequency interference (RFI). Previous studies reveal that PSR J1727−2739 exhibits both nulling and subpulse drifting. We estimate the nulling fraction to be 66%±1.4%, which is consistent with previously published results. In addition to the previously known subpulse drifting in the leading component, we also explore the drifting properties for the trailing component. We observe two distinct drift modes whose vertical drift band separations ( 3 ) are consistent with earlier studies. We find that both profile components share the same drift periodicity 3 in a certain drift mode, but the measured horizontal separations ( 2 ) are quite different for them. That is, PSR J1727−2739 is a pulsar showing both changes of drift periodicity 3 between different drift modes and drift rate variations between components in a given drift mode. Pulsars exhibiting nulling along with drift mode changing, such as PSR J1727−2739, give an unique opportunity to investigate the physical mechanism of these phenomena.

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Periodic Q-mode modulation in PSR J1825−0935 (PSR B1822−09)

Cited by 23 publications

References 44 publications

The dissipation of toroidal magnetic fields and spin‐down evolution of young and strongly magnetized pulsars

The dissipation of toroidal magnetic fields and spin‐down evolution of young and strongly magnetized pulsars

Periodic mode changing in PSR J1048−5832

Nulling and subpulse drifting in PSR J1727-2739

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