A Compact Extreme Scattering Event Cloud toward AO 0235+164

2007/12/07 by C. E. Senkbeil, C. Senkbeil, S. P. Ellingsen +6 · 1 citation
Physics and Astronomy · #Amplitude #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #Cloud computing #Computational physics #Dark Matter and Cosmic Phenomena #Event (particle physics) #Gamma-ray bursts and supernovae #Optics #Physics #Scattering #astro-ph

paper · pdf · doi:10.1086/527300

11 pages, 2 figures

arxiv created 2007/12/07 · openalex publication_date 2007/12/14 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

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.

Citations

• The Fastest Relativistic Jets: VLBA Observations of Blazars with Apparent Speeds Exceeding 25c
• Dual-Frequency VSOP Observations of AO 0235+164
• First Results from MASIV: The Microarcsecond Scintillation-induced Variability Survey
• Multifrequency variability of the blazar AO 0235+164

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