Proposal code

w026

Proposal title

VSOP monitoring of superluminal source 1642+690

The

Investigators and their

Affiliations

P.I. Preston, R. Jet Propulsion Laboratory, USA
Venturi, T. Istituto di Radioastronomia del CNR, Italy
Tingay, S., Murphy, D., Meier, D., Jones, D. Jet Propulsion Laboratory, USA

Proposal Abstract

We propose to monitor 1642+690 at 3 epochs over a 12 month timescale at 5GHz, using VSOP in conjunction with the VLBA, in order to follow the morphological changes in this interesting superluminal blazar at high resolution. The superluminal expansion of the components in 1642+690 cannot be explained in terms of constant speed, and it is likely that projection effects on plasma moving along a helical path may cause the peculiar changes observed with ground-based observations. Also, 1642+690 is an example of a highly beamed blazar which has not been detected in >100 MeV gamma-rays. As such, VSOP observations may help elucidate the differences between the gamma-ray loud blazars and gamma-ray quiet blazars. The source is well placed in the sky for good VSOP monitoring, providing good 2-dimensional u-v coverage with no sun-angle constraints.

The full Cover Sheets (compressed post-script, typically 50kbytes) can be retrieved. Note that many 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 AO2 proposals were submitted in May 1998, and information such as affiliations and contact details has changed for some proposers since that time. The Cover Sheets (and the details on this page, which were derived from the Cover Sheets) may therefore have changed.