Taurus observations of the velocity field in the inner zone of NGC 6946 |
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Authors: | C Muñoz-Tuñon J Cepa J E Beckman |
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Institution: | (1) Instituto de Astrofisica de Canarias, La Laguna, Tenerife, Spain |
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Abstract: | We have obtained a two-dimensional velocity map in H of the inner 4 arc min zone of the Scd starburst galaxy NGC 6946 using the TAURUS interferometric spectrometer on the 2.5 m Isaac Newton Telescope. The major axis rotation curve is a cleen kinematic superposition of a central 1 kpc sphere with solid body rotation and a disc with density falling inversely with radius. We show clear evidence of symmetrical radial motions in the plane of the galaxy with velocity up to 100 km s–1 along axes offset from the major axis by up to ±30°. Along the bar at position angle 160° we see outflow out to –2 kpc and significant inflow beyond this radius. 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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