6 papers · 2 filters
A Compact Extreme Scattering Event Cloud Towards AO 0235+164
C. E. Senkbeil, S. P. Ellingsen, J. E. J. Lovell +3
We present observations of a rare, rapid, high amplitude Extreme Scattering Event toward the compact BL-Lac AO 0235+164 at 6.65 GHz. The ESE cloud is compact; we estimate its diame…
Observations of Intrahour Variable Quasars: Scattering in our Galactic Neighbourhood
H. E. Bignall, D. L. Jauncey, J. E. J. Lovell +3
Interstellar scintillation (ISS) has been established as the cause of the random variations seen at centimetre wavelengths in many compact radio sources on timescales of a day or l…
Emergence and disappearance of micro-arcsecond structure in the scintillating quasar J1819+3845
Jean-Pierre Macquart, Ger de Bruyn
The 4.8 GHz lightcurves of the scintillating intra-day variable quasar J1819+3845 during 2004-5 exhibit sharp structure, down to a time scale of 15 minutes, that was absent from li…
On the Detectability of Prompt Coherent GRB Radio Emission
J. -P. Macquart
Both induced Compton scattering and induced Raman scattering strongly limit the observability of the extremely bright (<< 10^21K), prompt coherent radio emission recently predicted…
Properties of the Scattering Screen in Front of Scintillating Quasar PKS 1257-326
H. E. Bignall, D. L. Jauncey, J. E. J. Lovell +3
PKS 1257-326 is a quasar showing extremely unusual, rapid interstellar scintillation (ISS), which has persisted for at least a decade. Simultaneous observations with the VLA and AT…
MASIV:The Microarcsecond Scintillation-Induced Variability Survey
J. E. J. Lovell, D. L. Jauncey, C. Senkbeil +8
We are undertaking a large-scale 5 GHz VLA survey of the northern sky to search for rapid intra-day variability (IDV). Over four observing epochs we found that 56% of the sources s…