Proposal code

w418

Proposal title

Extremely variable IDV source J1819+3845

The

Investigators and their

Affiliations

P.I. L.I. Gurvits JIVE, The Netherlands
J. Dennett-Thorpe Kapteyn Institute, The Netherlands
A.G. de Bruyn ASTRON, The Netherlands

Proposal Abstract

We propose to observe an extremely variable IDV source J1819+3845, in which short term variations are attributed to interstellar scintillation of a component at most 30 micro-arcseconds in diametre. This highly variable and strong (up to 0.4 Jy in strong quasi-regular hourly outbursts) will help to detect and image a weaker (~ 60 mJy), stable component of sub-mas size. The latter component could not be detected by ground-based VLBI at higher frequencies due to its apparent steeper (or less inverted) spectrum but is of crucial importance for understanding the nature of the extremely violent variablity in the source. The project proposed will be closely coordinated with the ongoing monitoring at the Westerbork Synthesis Radio Telescope.

The full Cover Sheets (compressed post-script, typically 50kbytes) can be retrieved. Note that some proposals were reduced in extent by the Scientific Review Committee (e.g. by reducing the number of experiments), however the Cover Sheets contain the full proposal as submitted. Also note that AO4 proposals were submitted in October 2000, and information such as affiliations and contact details has changed for some proposers since that time.