Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...151..144m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 151, no. 1, Oct. 1985, p. 144-150.
Astronomy and Astrophysics
Astrophysics
11
Astronomical Spectroscopy, Ionized Gases, Radial Velocity, Spiral Galaxies, Velocity Distribution, Density Wave Model, Fabry-Perot Interferometers, Galactic Rotation, H Alpha Line
Scientific paper
The first detailed velocity field of the ionized gas in NGC 300 has been obtained from Perot-Fabry interferograms in H-alpha light taken with the 3.6 m and 1.5 m ESO telescopes at La Silla, Chile. Some 1800 velocity measurements were averaged in squares of 25.6 x 25.6 arcsec on the sky. The isovelocity lines that could be drawn are in good agreement with previous 21 cm studies of the neutral hydrogen. The position angle of the major axis is found around 105 deg and close to 0 deg for the minor axis. Accretion of gas may explain why they do not appear perfectly perpendicular although the simpler hypothesis is that the warping of the disk in NGC 300 is still more extended towards the center than previously thought. The isovelocity lines exhibit distortions when crossing the spiral arms; they are likely to be explained by a density wave perturbation.
Boulesteix Jacques
Georgelin Y. P.
Marcelin Michel
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