Proposal code

w049

Proposal title

OH absorption study in the nucleus of NGC 4945: Search for circumnuclear molecular gas on sub-parsec scale

The

Investigators and their

Affiliations

P.I. Yoshiaki Hagiwara Grad. Univ. for Advanced Studies, Japan
Seiji Kameno NAO, Mitaka, Japan
Makoto Miyoshi Mizusawa Observatory, Japan
Philip Edwards ISAS, Japan
Ryohei Kawabe Nobeyama Radio Observatory, Japan
Takeshi Miyaji Nobeyama Radio Observatory, Japan

Proposal Abstract

Proposal Abstract : NGC4945 is well known AGN as a first detected water megamaser source, however, because of its low declination of --49 deg. imaging VLBI observations on milliarcsecond (mas) scale have not ever been carried out. The distribution of symmetric maser emission shows the edge-on rotational motion implying the maser disk by analogy with that of NGC 4258 in the recent VLBI study. Also, most intense OH absorptions (1667 MHz, 1720 MHz) in AGNs were detected towards the nucleus of NGC 4945. The absorption could possibly the tracer of the molecular disk surrounding the AGN nucleus as well as water maser. The promising angular resolution of a few mas for the HALCA baselines would enable us to image OH molecular absorption in the nearby AGN, NGC 4945 for the first time on sub-parsec scale.

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.