Mean Pulse Shape and Polarization of PSR J0437−4715

Navarro, José A.; Manchester, R. N.; Sandhu, J. S.; Kulkarni, S. R.; Bailes, M.

doi:10.1086/304563

Cited by 88 publications

(108 citation statements)

References 23 publications

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“…For PSR J2145-0750, we did not detect a significant number of single pulses with high S/N (peak>10 baseline rms) in our 325 MHz data, and hence we do not include this data in our subsequent analysis. The folded profiles from our observations at each frequency band are given in Figures 1 and 2, for the pulsars J0437-4715 (at 325 MHz and 610 MHz) and J2145-0750 (at 610 MHz), respectively, which are consistent with previously published polarization profiles at these frequencies (Navarro et al 1997;Stairs et al 1999). …”

Section: Discussionsupporting

confidence: 89%

Detection of Polarized Quasi-Periodic Microstructure Emission in Millisecond Pulsars

Gupta

Sharma

2016

ApJL

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Microstructure emission, involving short timescale, often quasi-periodic, intensity fluctuations in subpulse emission, is well known in normal period pulsars. In this Letter, we present the first detections of quasi-periodic microstructure emission from millisecond pulsars (MSPs), from Giant Metrewave Radio Telescope observations of two MSPs at 325 and 610 MHz. Similar to the characteristics of microstructure observed in normal period pulsars, we find that these features are often highly polarized and exhibit quasi-periodic behavior on top of broader subpulse emission, with periods of the order of a few μs. By measuring their widths and periodicities from single pulse intensity profiles and their autocorrelation functions, we extend the microstructure timescale-rotation period relationship by more than an order of magnitude down to rotation periods ∼5 ms, and find it to be consistent with the relationship derived earlier for normal pulsars. The similarity of behavior is remarkable, given the significantly different physical properties of MSPs and normal period pulsars, and rules out several previous speculations about the possible different characteristics of microstructure in MSP radio emission. We discuss the possible reasons for the non-detection of these features in previous high time resolution MSP studies along with the physical implications of our results, both in terms of a geometric beam sweeping model and temporal modulation model for micropulse production.

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Section: Discussionsupporting

confidence: 89%

Detection of Polarized Quasi-Periodic Microstructure Emission in Millisecond Pulsars

Gupta

Sharma

2016

ApJL

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“…However, the spectra of MSPs and normal pulsars are similar (Toscano et al 1998;Kramer et al 1998Kramer et al , 1999a. Both MSPs and normal pulsars often have a high degree of linear polarization and orthogonal-mode position angle (PA) jumps (see e.g., Thorsett & Stinebring 1990;Navarro et al 1997;Stairs et al 1999;Manchester & Han 2004;Ord et al 2004). For MSPs the PAs often vary significantly with pulse phase and, in most cases, they do not fit the 'rotating vector model' (RVM, Radhakrishnan & Cooke 1969).…”

Section: Introductionmentioning

confidence: 99%

A study of multifrequency polarization pulse profiles of millisecond pulsars

Dai

Hobbs

Manchester

et al. 2015

Monthly Notices of the Royal Astronomical Society

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154

187

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We present high signal-to-noise ratio, multi-frequency polarization pulse profiles for 24 millisecond pulsars that are being observed as part of the Parkes Pulsar Timing Array (PPTA) project. The pulsars are observed in three bands, centred close to 730, 1400 and 3100 MHz, using a dual-band 10 cm/50 cm receiver and the central beam of the 20 cm multibeam receiver. Observations spanning approximately six years have been carefully calibrated and summed to produce high S/N profiles. This allows us to study the individual profile components and in particular how they evolve with frequency. We also identify previously undetected profile features. For many pulsars we show that pulsed emission extends across almost the entire pulse profile. The pulse component widths and component separations follow a complex evolution with frequency; in some cases these parameters increase and in other cases they decrease with increasing frequency. The evolution with frequency of the polarization properties of the profile is also non-trivial. We provide evidence that the pre-and post-cursors generally have higher fractional linear polarization than the main pulse. We have obtained the spectral index and rotation measure for each pulsar by fitting across all three observing bands. For the majority of pulsars, the spectra follow a single power-law and the position angles follow a λ 2 relation, as expected. However, clear deviations are seen for some pulsars. We also present phase-resolved measurements of the spectral index, fractional linear polarization and rotation measure. All these properties are shown to vary systematically over the pulse profile.

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“…To date, limited polarimetric studies of the faster millisecond pulsars (MSPs) have suggested that their pulse components do not Ðt easily into these classiÐcation schemes and frequently have more complex polarimetric proÐles than slow pulsars (Thorsett & Stinebring 1990 ;Navarro et al 1997 ;Xilouris et al 1998).…”

Section: Introductionmentioning

confidence: 99%

Coherently Dedispersed Polarimetry of Millisecond Pulsars

Stairs

Thorsett

Camilo

1999

ASTROPHYS J SUPPL S

104

196

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We present a large sample of high-precision, coherently dedispersed polarization proÐles of millisecond pulsars (MSPs) at frequencies between 410 and 1414 MHz. These data include the Ðrst polarimetric observations of several of the pulsars and the Ðrst low-frequency polarization proÐles for others. Our observations support previous suggestions that the pulse shapes and polarimetry of MSPs are more complex than those of their slower relatives. An immediate conclusion is that polarimetry-based classiÐcation schemes proposed for young pulsars are of only limited use when applied to millisecond pulsars.

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Mean Pulse Shape and Polarization of PSR J0437−4715

Cited by 88 publications

References 23 publications

Detection of Polarized Quasi-Periodic Microstructure Emission in Millisecond Pulsars

Detection of Polarized Quasi-Periodic Microstructure Emission in Millisecond Pulsars

A study of multifrequency polarization pulse profiles of millisecond pulsars

Coherently Dedispersed Polarimetry of Millisecond Pulsars

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