Proposal code

w328

Proposal title

High Resolution Imaging of An Inverted Source PKS1124--186

The

Investigators and their

Affiliations

P.I. Yoshiharu Asaki ISAS, Japan
Kenta Fujisawa NAO, Japan

Proposal Abstract

We propose observations of PKS1124--186. This object has an inverted spectrum from 1 GHz to 90GHz. A VSOP observation at 1.6GHz shows no structure and the brightness temperature is 8.2 \times 10^{12}K. One of ideas to explain those characteristics is that this object is very young, so that high energy electron has been supplied and/or vsry dense cloud very close to the activity center significantly absorbs the low frequency emission. Another idea is that, although the intrinsic size is small and the activity is not large, the jet is significantly amplified due to large Doppler factor bacause the jet axis is very close to observer's line of sight. If the latter is true, PKS1124--186 is no longer young. To determine the charactreristics of this source, higher resolution imaging and obtain the spectrum information are needed. We will investigate whether this source is an unique object or not (especially the age) by VSOP high resolution imaging at 1.6 and 5GHz.

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 AO3 proposals were submitted in October 1999, 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.