Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...108..134m&link_type=abstract
Astronomy and Astrophysics, vol. 108, no. 1, Apr. 1982, p. 134-140.
Astronomy and Astrophysics
Astrophysics
13
Barred Galaxies, Gas Dynamics, Interstellar Gas, Ionized Gases, Velocity Distribution, Angular Momentum, Angular Velocity, H Alpha Line, Rotating Fluids
Scientific paper
The velocity field of the ionized gas in NGC 925 has been drawn from Perot-Fabry interferograms in Hα light obtained with the 6 m S.A.O. telescope, in Soviet Union. 674 velocity points permit the isovelocity lines to be drawn with a 10 km s-1 step. The main perturbations of the velocity field, compared with a rotating disk, are due to the southern arm, which is the main arm of this galaxy; such perturbations, also seen in H i, are probably the signature of a density wave. The bar rotates like a solid body with an angular velocity of 55 km s-1 arc min-1, close to that of the disk, which indicates a rather low angular momentum for a Sc type galaxy. The systemic velocity is found to be 553 km s-1 ± 5 km s-1 and the distance to the galaxy is clearly less than 10 Mpc. Assuming a distance of 7 Mpc we find a mass (within 6') of 2.1 ± 0.2 1010 Msun for NGC 925.
Boulesteix Jacques
Courtes Georges
Marcelin Michel
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