High temporal resolution observations of the pulsar microstructure at 102 MHz

Kuzmin, A. D., Hamilton, P. A., Shitov, Yu P., McCulloch, P. M., McConnell, D. and Pugatchev, V. D. 2003, High temporal resolution observations of the pulsar microstructure at 102 MHz, Monthly notices of the royal astronomical society, vol. 344, no. 4, pp. 1187-1192, doi: 10.1046/j.1365-8711.2003.06900.x.

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Title High temporal resolution observations of the pulsar microstructure at 102 MHz
Author(s) Kuzmin, A. D.
Hamilton, P. A.
Shitov, Yu P.
McCulloch, P. M.
McConnell, D.
Pugatchev, V. D.
Journal name Monthly notices of the royal astronomical society
Volume number 344
Issue number 4
Start page 1187
End page 1192
Publisher Wiley-Blackwell Publishing Ltd.
Place of publication Oxford, England
Publication date 2003
ISSN 0035-8711
Keyword(s) Scattering – pulsars
General – pulsars
PSR B0950+08 – radio continuum
Summary We report observations of the microstructure of 7 pulsars at 102 MHz with a time resolution of up to 1 μs. We have detected fine pulse structure with a μs time-scale for all seven pulsars. We observe that interstellar scattering does not broaden the μs time-scale pulsar microstructure, and find structure of a time-scale much shorter than the interstellar scatter broadening. In addition to the previously known structure with time-scale τμ of tens of μs, we have detected structures with characteristic time-scale of a few μs, nearly equal to the reciprocal of the analysis bandwidth. This suggests that even shorter micropulses may exist.
Micropulses usually cluster in groups, each of duration tens to hundreds of μs, which may be identified as microstructure observed previously with smaller time resolution.
In addition to the previously known quasi-periodicity of hundreds of milliseconds, we reveal a structures with characteristic period of tens of μs. We observe structures with short quasi-periodicity to have a limited bandwidth. The characteristic period Pμ of these structures in PSR B0950+08 does not have a common value for different frequency regions in the same single pulse.
Scattering was revealed as a train of quasi-periodic micropulses with an exponentially damped envelope. The scatter-broadening and decorrelation bandwidth were measured. We report two time-scales of decorrelation bandwidth of pulsar PSR B0950+08 and propose two branches of Δνd(ν) dependence.
The dispersion measure of PSR B0950+08 as DM= 2.9686 ± 0.0001 pc cm−3 has been determined.
Notes External
Language eng
DOI 10.1046/j.1365-8711.2003.06900.x
Field of Research 020199 Astronomical and Space Sciences not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2003, RAS
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008590

Document type: Journal Article
Collection: Office of the Deputy Vice-Chancellor Research
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