Hostname: page-component-78c5997874-fbnjt Total loading time: 0 Render date: 2024-11-18T06:11:11.570Z Has data issue: false hasContentIssue false
  • English
  • Français

Precision Pulsar Timing in the Presence of Interstellar Weather – PSR B1937+21 and the Crab Pulsar

Published online by Cambridge University Press:  12 April 2016

D. C. Backer  and
T. Wong
D. C. Backer
Affiliation:
Astronomy Department, University of California at Berkeley
T. Wong
Affiliation:
Astronomy Department, University of California at Berkeley

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We report on six months of dual-frequency, precision timing of PSR B1937+21 and the Crab pulsar. Variations in the column density of electrons – interstellar weather – are studied. The column is not unique in the presence of frequency-dependent multipath scattering, and this may explain the non-square law dependence of systematic timing residuals on B1937+21. The electron column density variations of the Crab pulsar are summarized in a structure function that ranges from 1012 cm to 1015 cm. These density fluctuations are located in the thermal shell surrounding the synchrotron nebula.

Type
Part 2 Precision Measurements
Information
International Astronomical Union Colloquium , Volume 160: Pulsars: Problems and Progress , 1996 , pp. 87 - 90
Copyright
Copyright © Astronomical Society of the Pacific 1996

References

Backer, D.C. 1993, in Proc. 4th Predoctoral Summer School of EADN, ed. van Paradis, J., [Springer: Berlin] LNP 418, 193.Google Scholar
Backer, D.C., Hama, S., Van Hook, S., & Foster, R.S. 1993, ApJ, 404, 636.CrossRefGoogle Scholar
Groth, E.J. et al. 1975, ApJS, 29, 453.Google Scholar
Hester, J.J. et al. 1996, ApJ, in press.Google Scholar
Kaspi, V.M. et al. 1994, ApJ, 428, 713.Google Scholar
Lawrence, S.S. et al. 1995, AJ, 109 2635.Google Scholar
Rankin, J.M. et al. 1988, A&A, 202, 166.Google Scholar
Ryba, M.F. 1991, Ph. D. Thesis, Princeton University.Google Scholar