Proposal code

w025

Proposal title

VSOP and the bursting gamma-ray source, PKS 2255-282

The

Investigators and their

Affiliations

P.I. S. Tingay Jet Propulsion Laboratory, USA
M. Tornikoski Metsahovi Radio Observatory, Finland
A. Muecke, H. Bignall, R. Clay University of Adelaide, Australia
A. Tzioumis, E. King Australia Telescope National Facility, Australia
J. Lovell ISAS, Japan

Proposal Abstract

In 1998 January the AGN PKS 2255-282 was identified as a source of >100 MeV gamma-rays when the EGRET instrument aboard the Compton Gamma-Ray Observatory (CGRO) detected a bright high energy flare from its direction. We have been monitoring this source at mm and cm wavelengths, in both total flux and with VLBI, since early 1997, thus obtaining good quality pre-flare monitoring data. In this proposal we request observations with the VSOP mission, to obtain images of PKS 2255-282 at two epochs approximately 6 months apart. We aim to monitor changes in the high-resolution structure of the core and jet during the expected mm and cm radio flaring following the gamma-ray outburst, in an attempt to detect the ejection of possible jet components generated by the 1998 January gamma-ray event.

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.