The Radial Structure of Pulsar Radio Emission Regions

Wu, Xiaoguang; Huang, Zhankui; Xu, Xuan-Bin

doi:10.1088/1009-9271/2/5/454

Cited by 9 publications

(7 citation statements)

References 20 publications

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“…A small inclination angle is consistent with the analysis of Wu et al (2002), for instance, who found α = 7.4…”

Section: Polarizationsupporting

confidence: 91%

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Investigation of the bi-drifting subpulses of radio pulsar B1839−04 utilising the open-source data-analysis project PSRSALSA

Weltevrede

2016

A&A

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Aims. The usefulness and versatility of the PSRSALSA open-source pulsar data-analysis project is demonstrated through an analysis of the radio pulsar B1839−04. This study focuses on the phenomenon of bi-drifting, an effect where the drift direction of subpulses is systematically different in different pulse profile components. Bi-drifting is extremely rare in the pulsar population, and the theoretical implications are discussed after comparing B1839−04 with the only other known bi-drifter. Methods. Various tools in PSRSALSA, including those allowing quantification of periodicities in the subpulse modulation, their flux distribution, and polarization properties, are exploited to obtain a comprehensive picture of the radio properties of PSR B1839−04. In particular, the second harmonic in the fluctuation spectra of the subpulse modulation is exploited to convincingly demonstrate the existence of bi-drifting in B1839−04. Bi-drifting is confirmed with a completely independent method allowing the average modulation cycle to be determined. Polarization measurements were used to obtain a robust constraint on the magnetic inclination angle. Results. The angle between the rotation and magnetic axis is found to be smaller than 35 • . Two distinct emission modes are discovered to be operating, with periodic subpulse modulation being present only during the weaker mode. Despite the variability of the modulation cycle and interruption by mode-changes, the modulation pattern responsible for the bi-drifting is strictly phase locked over a timescale of years such that the variability is identical in the different components. Conclusions. The phase locking implies that a single physical origin is responsible for both drift directions. Phase locking is hard to explain for many models, including those specifically proposed in the literature to explain bi-drifting, and they are therefore shown to be implausible. It is argued that within the framework of circulating beamlets, bi-drifting could occur if the circulation were severely distorted, possibly by distortions in the magnetic field.

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“…A small inclination angle is consistent with the analysis of Wu et al (2002), for instance, who found α = 7.4…”

Section: Polarizationsupporting

confidence: 91%

“…These results are consistent with other studies (e.g. Gould & Lyne 1998;Wu et al 1993Wu et al , 2002Chen & Wang 2014). Weltevrede et al (2006a) studied a large sample of radio pulsars for individual pulse modulation.…”

Section: Introductionsupporting

confidence: 91%

Investigation of the bi-drifting subpulses of radio pulsar B1839−04 utilising the open-source data-analysis project PSRSALSA

Weltevrede

2016

A&A

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“…Regrettably, we are not able compare some of our results with experiments because there is no information reported in the literature about the response of the low-frequency modes of a-Ge to pressure and Grüneisen parameters of a-Ge. However, the behavior of the optic-like and acoustic-like frequencies of a-Ge as a function of pressure is similar to what has been observed in crystalline Ge [46][47][48]. Furthermore, the TA(X) and TO(C) modes of crystalline Ge have negative (À1.53) [47] and positive (1.14) [48] Grüneisen parameters, respectively.…”

Section: Discussionsupporting

confidence: 78%

Vibrational properties of amorphous germanium under pressure and its thermal expansion and Grüneisen parameters

Durandurdu

2010

Journal of Non-Crystalline Solids

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“…In comparison, the enzymatic approach to convert CO 2 has several advantages such as high yields and selectivity under milder reaction conditions (lower temperature and pressure) without pollution [4][5][6]. For example, a combination of formate dehydrogenase (FateDH), formaldehyde dehydrogenase (FaldDH) and alcohol dehydrogenase (ADH) was used in consecutive reduction of CO 2 to methanol [6][7][8].…”

Section: Enzymatic Conversion Of Comentioning

confidence: 99%

Efficient conversion of CO2 to formic acid by formate dehydrogenase immobilized in a novel alginate–silica hybrid gel

et al. 2006

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The Radial Structure of Pulsar Radio Emission Regions

Cited by 9 publications

References 20 publications

Investigation of the bi-drifting subpulses of radio pulsar B1839−04 utilising the open-source data-analysis project PSRSALSA

Investigation of the bi-drifting subpulses of radio pulsar B1839−04 utilising the open-source data-analysis project PSRSALSA

Vibrational properties of amorphous germanium under pressure and its thermal expansion and Grüneisen parameters

Efficient conversion of CO2 to formic acid by formate dehydrogenase immobilized in a novel alginate–silica hybrid gel

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