TAURUS observations of the velocity field in the inner zone of NGC 6946

Details TAURUS observations of the velocity field in the inner zone of NGC 6946 TAURUS observations of the velocity field in the inner zone of NGC 6946

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.157..157m&link_type=abstract

(Instituto de Astrofisica de Canarias and Comision Interministerial de Ciencia y Tecnologia, Summer School on Evolutionary Pheno

Astronomy and Astrophysics

Astrophysics

2

H Alpha Line, Star Formation, Starburst Galaxies, Astronomical Spectroscopy, Taurus Constellation

Scientific paper

A two-dimensional velocity map in H-alpha of the inner 4 arc min zone of the Scd starburst galaxy NGC 6946 has been obtained using the TAURUS interferometric spectrometer on the 2.5 m Isaac Newton Telescope. The major axis rotation curve is a clean kinematic superposition of a central 1 kpc sphere with solid body rotation and a disk with density falling inversely with radius. Clear evidence is shown of symmetrical radial motions in the plane of the galaxy with velocity up to 100 km/s along axes offset from the major axis by up to + or - 30 deg. Along the bar at position angle 160 deg, outflow out to -2 kpc and significant inflow beyond this radius are seen. These velocity fields give clues to the nature of the starburst process within the central 1 kpc zone of the galaxy.

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