Proposal code

w046

Proposal title

Second-epoch observations of 0735+178

The

Investigators and their

Affiliations

P.I. José-Luis Gómez Instituto de Astrof\'{\i}sica de Andaluc\'{\i}a, Spain
Antonio Alberdi Instituto de Astrof\'{\i}sica de Andaluc\'{\i}a, Spain
Alan P. Marscher Boston University, USA

Proposal Abstract

Recent 22 GHz VLBA observations of the BL Lac object 0735+178 have revealed a pair of sharp, 90^\circ bends such that, between 2 and 5 mas from the core, the jet has the same direction as in the inner 1 mas, but is offset to the north by 1.7 mas. We are scheduled to observe 0735+178 at 5 GHz with a VLBI array including HALCA on 16 Dec 1998, and have monitored the source with the VLBA at higher frequencies since Nov 1996. We propose a 2nd epoch at 5 GHz with an array including HALCA in 1999 in order to determine the evolution of the source structure. If possible, we wish to observe in both LCP and RCP so that the polarization structure can be determined. The main question to be answered is whether the strangely bent structure results from sudden changes in the direction of the nozzle or from an intrinsically curved jet flow.

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.