A compact extreme scattering event cloud toward AO 0235+164

Creators: Senkbeil, C. E.; Ellingsen, S. P.; Lovell, J. E. J.; Macquart, J.-P.; Cimò, G.; Jauncey, D. L.

Abstract

We present observations of a rare, rapid, high-amplitude extreme scattering event toward the compact BL Lac object AO 0235+164 at 6.65 GHz. The ESE cloud is compact; we estimate its diameter between 0.09 and 0.9 AU, with a distance of less than 3.6 kpc. Limits on the angular extent of the ESE cloud imply a minimum cloud electron density of ~4 × 10^3 cm^(−3). Based on the amplitude and timescale of the ESE observed here, we suggest that at least one of the transients reported by Bower et al. may be attributed to ESEs.

Additional Information

© 2008 The American Astronomical Society. Received 2007 October 29; accepted 2007 November 27; published 2007 December 14. This research has been supported by ARC grant DP0342500 at the University of Tasmania. We thank Bev Bedson for her vital contribution to the operation of the Ceduna observatory and the COSMIC project. We thank Stefan Dieters for searching the archives of satellite-based observatories for events coincident with the ESE detection. The National Radio Astronomy Observatory is a Facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This research was supported in part by NASA grant JPL 1253153 to the University of Minnesota.

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