Proposal code

w509

Proposal title

Monitoring PKS 1413+135 for Superluminal Motion and Spectral Evolution

The

Investigators and their

Affiliations

P.I. Glen I. Langston NRAO USA
Eric S. Perlman Space Telescope Science Institute, USA
Anthony Minter NRAO USA
Ian Avruch NFRA, Holland

Proposal Abstract

We request three epochs of VLBA and HALCA observations of PKS1413+135 at 5 GHz, as well as contemporaneous VLBA-only observations at 15 GHz. Our goal is to confirm superluminal motion of the inner components of PKS1413+135 and detect the spectral change of these components. PKS1413+135 is one of the brightest red BL Lacs, and is an extremely compact radio source: total size ~ 400 pc. VLBA and HALCA observations have revealed evolution on both sides of the nucleus, and suggest that there is superluminal motion of the inner most components of the source, but that outer components are stationary or slowly moving. \vskip 3mm The super luminal motion is difficult to reconcile with unified schemes, unless the jet is strongly bent within a few milli-arcseconds of the core.

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 AO5 proposals were submitted in February 2001, and information such as affiliations and contact details has changed for some proposers since that time.