Journal Article

Observations of microglitches in Hartebeesthoek Radio Astronomy Observatory radio pulsars

A. E. Chukwude and J. O. Urama

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 406, issue 3, pages 1907-1917
Published in print August 2010 | ISSN: 0035-8711
Published online August 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16789.x
Observations of microglitches in Hartebeesthoek Radio Astronomy Observatory radio pulsars

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A detailed observation of the microglitch phenomenon in relatively slow radio pulsars is presented. Our analyses for these small amplitude jumps in pulse rotation frequency (ν) and/or spin-down rate () combine the traditional manual detection method (which hinges on careful visual inspections of the residuals of pulse phase residuals) and a new, and perhaps more objective, automated search technique (which exploits the power of the computer, rather than the eyes, for resolving discrete events in pulsar spin parameters). The results of the analyses of a sample of 26 radio pulsars reveal that (i) only 20 pulsars exhibit significant fluctuations in their arrival times to be considered suitable for meaningful microglitch analyses; (ii) a phenomenal 299 microglitch events were identified in ν and/or : 266 of these events were found to be simultaneously significant in ν and , while 19 and 14 were noticeable only in ν and , respectively; (iii) irrespective of sign, the microglitches have fractional sizes which cover about three orders of magnitude in ν and and ) with median values as 0.78 × 10−9 and 0.36 × 10−3, respectively.

Keywords: methods: data analysis; stars: neutron; pulsars: general

Journal Article.  6455 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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