A Compact Extreme Scattering Event Cloud toward AO 0235+164
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Copyright © 2008 The American Astronomical Society ("AAS")-[The Astrophysical Journal (ApJ) Senkbeil, C., 2008 ApJS 672, L95-L98.]
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 x 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.
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