An H I study of the galaxy NGC 4945 with a two-element synthesis telescope

Details An H I study of the galaxy NGC 4945 with a two-element synthesis telescope An H I study of the galaxy NGC 4945 with a two-element synthesis telescope

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.226..157a&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 226, May 1, 1987, p. 157-171.

Astronomy and Astrophysics

Astronomy

37

Hydrogen Clouds, Radio Telescopes, Spiral Galaxies, Synthetic Apertures, Absorption Spectra, Galactic Radiation, Infrared Spectra, Spatial Distribution

Scientific paper

TEST, a two-element synthesis telescope operating at 1.4 GHz, consists of the Parkes 64-m radio telescope and a movable 18-m antenna. The system has several unconventional features, which are described. TEST has been used for an H I study of the edge-on spiral galaxy NGC 4945; the angular resolution was 47×73 arcsec2. H I absorption and emission are both present in the galaxy. The absorption occurs against the small-diameter radio nucleus and its velocity range (380 - 740 km s-1) is almost as large as the range observed across the entire galaxy. The absorbing clouds are probably located within a few hundred parsecs of the nucleus. The H I emission is extended along the optical major axis of the galaxy. Structure symmetrical about the nucleus in the H I distribution may be related to spiral features or rings of gas. A rotation curve fitted to the velocity field yields a total mass of 8.8×1010M_sun;. The velocity field shows departures from uniform circular motion which have been interpreted in terms of radial motions of 20 - 30 km s-1 towards the nucleus.

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