The Filling Fraction of Electrons in the Warm Ionized Medium

Details The Filling Fraction of Electrons in the Warm Ionized Medium The Filling Fraction of Electrons in the Warm Ionized Medium

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.8109p&link_type=abstract

American Astronomical Society Meeting 207, #81.09; Bulletin of the American Astronomical Society, Vol. 37, p.1302

Astronomy and Astrophysics

Astronomy

Scientific paper

Pulsars found in globular clusters allow for the determination of the filling fraction of electrons in the warm interstellar medium by comparing the measured DM and EM values along the line of sight to the cluster. Reynolds, et al. (1991, ApJ, 372, 17L) used pulsars towards 4 globular clusters and found that the filling fraction of electrons along the line of sight was about 0.20. Over the past decade, many more pulsars in globular clusters have been discovered and therefore it is of interest to further investigate the filling fraction within the medium. Currently there are 8 clusters containing pulsars that can be used. Using these 8 clusters we have found an average filling fraction of 0.19. There is marginal evidence that the filling factor increases with increasing distance out of the plane. The data indicate that more detailed analysis is needed with the effects of the local bubble needing to be taken into account.
Funding was provided by NSF and NRAO.

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