H-alpha morphology and kinematics of the spiral galaxy NGC 3198

Details H-alpha morphology and kinematics of the spiral galaxy NGC 3198 H-alpha morphology and kinematics of the spiral galaxy NGC 3198

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...244...27c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 1, April 1991, p. 27-36.

Astronomy and Astrophysics

Astronomy

20

Galactic Rotation, Galactic Structure, H Alpha Line, H Ii Regions, Spiral Galaxies, Astronomical Models, Emission Spectra, Fabry-Perot Interferometers, Kinematics, Radio Astronomy

Scientific paper

Scanning Fabry-Perot observations of the well known spiral galaxy NGC 3198 are presented. Reconstructed H-alpha images are used to compile a catalog of 104 H II-regions. The velocity field shows evidence for systematic deviations from purely axisymmetric rotation in the inner parts, but is symmetric at larger radii. A global uniform contraction of an inner ringlike structure is described, but the question of the presence of a central bar remains controversial. The rotation curve out to about 3.3 arcmin = 9.5 kpc is presented, and found to be in very good agreement with other determinations in the literature.

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