Pulsar nulling and mode changing

Wang, Na; Manchester, R. N.; Johnston, S.

doi:10.1111/j.1365-2966.2007.11703.x

Cited by 276 publications

(394 citation statements)

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“…Five others (group B; PSRs J0137+6349, J0335+6623, J0944+4106, J1059+6459, and J1647+6609) showed obvious single-pulse emission, but no null distribution was apparent in any of their ON histograms using existing data. Based on our analysis, pulsars from group A have single-pulse emission below our detection threshold, but because of the intensity variability apparent in their discovery plots, we may be able to carry out a similar analysis by summing groups of single pulses (as in Wang et al 2007) and looking for longer nulls. Pulsars from group B may have extremely low NFs, which may be detectable with extended data sets.…”

Section: Nulling and Intermittent Pulsarsmentioning

confidence: 99%

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The Green Bank North Celestial Cap Pulsar Survey. III. 45 New Pulsar Timing Solutions

Lynch

Swiggum

Kondratiev

et al. 2018

ApJ

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We provide timing solutions for 45 radio pulsars discovered by the Robert C. Byrd Green Bank Telescope. These pulsars were found in the Green Bank North Celestial Cap pulsar survey, an all-GBT-sky survey being carried out at a frequency of 350 MHz. We include pulsar timing data from the Green Bank Telescope and Low Frequency Array. Our sample includes five fully recycled millisecond pulsars (MSPs, three of which are in a binary system), a new relativistic double neutron star system, an intermediate-mass binary pulsar, a mode-changing pulsar, a 138 ms pulsar with a very low magnetic field, and several nulling pulsars. We have measured two post-Keplerian parameters and thus the masses of both objects in the double neutron star system. We also report a tentative companion mass measurement via Shapiro delay in a binary MSP. Two of the MSPs can be timed with high precision and have been included in pulsar timing arrays being used to search for low-frequency gravitational waves, while a third MSP is a member of the black widow class of binaries. Proper motion is measurable in five pulsars, and we provide an estimate of their space velocity. We report on an optical counterpart to a new black widow system and provide constraints on the optical counterparts to other binary MSPs. We also present a preliminary analysis of nulling pulsars in our sample. These results demonstrate the scientific return of long timing campaigns on pulsars of all types.

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Section: Nulling and Intermittent Pulsarsmentioning

confidence: 99%

“…Since it is clear when the pulsar is in an ON or OFF state, we do not expect it to bias the results of our nulling analysis. spin period, characteristic age, and profile morphology (e.g., Ritchings 1976;Rankin 1986;Biggs 1992;Vivekanand 1995;Wang et al 2007).…”

Section: Nulling and Intermittent Pulsarsmentioning

confidence: 99%

The Green Bank North Celestial Cap Pulsar Survey. III. 45 New Pulsar Timing Solutions

Lynch

Swiggum

Kondratiev

et al. 2018

ApJ

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“…Many pulsars like PSR B2319+60 (Wright & Fowler 1981), PSR B0943+10 (Suleymanova et al 1998) and PSR B1918+19 (Rankin et al 2013) exhibit this phenomenon. Both nulling and mode changing have been studied in ∼200 pulsars so far (Biggs 1992;Weltevrede et al 2006;Wang et al 2007;Gajjar et al 2012). PSR B0611+22 has been classified as a core emission pulsar with a single component (Rankin 1983).…”

Section: Introductionmentioning

confidence: 99%

“…They were first observed and reported by Backer (Backer 1970a,b,c,d). Mode changing pulsars are pulsars in which, from time to time, the mean profile abruptly changes between two or more quasistable states (Wang et al 2007;Bartel 1982) while nulling is the abrupt cessation of radio emission for one or more pulse periods. Nulling has been postulated to be an extreme case of mode changing (Wang et al 2007;Timokhin 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Mode changing pulsars are pulsars in which, from time to time, the mean profile abruptly changes between two or more quasistable states (Wang et al 2007;Bartel 1982) while nulling is the abrupt cessation of radio emission for one or more pulse periods. Nulling has been postulated to be an extreme case of mode changing (Wang et al 2007;Timokhin 2010). In a series of papers, Rankin (Rankin 1983(Rankin , 1986Rankin & Ramachandran 2003) tried to understand the emission geometry and behaviour of such pulsars.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous radio and X-ray observations of PSR B0611+22

Rajwade

Seymour²,

Lorimer

et al. 2016

Mon. Not. R. Astron. Soc.

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We report results from simultaneous radio and X-ray observations of PSR B0611+22 which is known to exhibit bursting in its single-pulse emission. The pulse phase of the bursts vary with radio frequency. The bursts are correlated in 327/150 MHz datasets while they are anti-correlated, with bursts at one frequency associated with normal emission at the other, in 820/150 MHz datasets. Also, the flux density of this pulsar is lower than expected at 327 MHz assuming a power law. We attribute this unusual behaviour to the pulsar itself rather than absorption by external astrophysical sources. Using this dataset over an extensive frequency range, we show that the bursting phenomenon in this pulsar exhibits temporal variance over a span of few hours. We also show that the bursting is quasi-periodic over the observed band. The anti-correlation in the phase offset of the burst mode at different frequencies suggests that the mechanisms responsible for phase offset and flux enhancement have different dependencies on the frequency. We did not detect the pulsar with XMM-Newton and place a 99% confidence upper limit on the X-ray efficiency of 10 −5 .

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Pulsars as Fantastic Objects and Probes

Han

Astrophysics and Space Science Proceedings

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Pulsars are fantastic objects, which show the extreme states of matters and plasma physics not understood yet. Pulsars can be used as probes for the detection of interstellar medium and even the gravitational waves. Here I review the basic facts of pulsars which should attract students to choose pulsar studies as their future projects.Comment: Invited Lecture on the "First Kodai-Trieste Workshop on Plasma Astrophysics", Kodaikanal Obs, India. Aug.27-Sept.7th, 2007. In: "Turbulence, Dynamos, Accretion Disks, Pulsars and Collective Plasma Processes". Get a copy from: http://www.springerlink.com/content/978-1-4020-8867-

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Pulsar nulling and mode changing

Cited by 276 publications

References 40 publications

The Green Bank North Celestial Cap Pulsar Survey. III. 45 New Pulsar Timing Solutions

The Green Bank North Celestial Cap Pulsar Survey. III. 45 New Pulsar Timing Solutions

Simultaneous radio and X-ray observations of PSR B0611+22

Pulsars as Fantastic Objects and Probes

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