Proposal code

w410

Proposal title

The Second-Epoch Observations of 3C 380

The

Investigators and their

Affiliations

P.I. KAMENO Seiji NAO, Japan
SHEN Zhi-Qiang ISAS, Japan
INOUE Makoto NAO, Japan
FUJISAWA Kenta NAO, Japan
WAJIMA Kiyoaki ISAS, Japan

Proposal Abstract

We propose the second-epoch observations of the quasar 3C 380 at 1.7 and 5 GHz. In the first-epoch observations on July 1998, we confirmed superluminal motions of the jet by comparing with ground VLBI. We found that the apparent velocities of components F and A were significantly different from each other in terms of the speed and position angle, while each component keeps each constant speed and straight motion for more than 15 years. We also found shell-like enhancements of the spectral indices at these components. The result can be evidence of ballistic adeabatique expansion of plasma blobs. The second-epoch VSOP observations, separated by 2.5 years, will measure the jet motions as accurate as the ground 15-year monitor, and allow us to investigate how straight the motion is (or acceleration, if any).

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.