Optical rotation velocities and images of the spiral galaxy NGC 3198

Details Optical rotation velocities and images of the spiral galaxy NGC 3198 Optical rotation velocities and images of the spiral galaxy NGC 3198

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91.1086h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 91, May 1986, p. 1086-1090. NASA-supported research.

Astronomy and Astrophysics

Astronomy

15

Angular Velocity, H Alpha Line, Spiral Galaxies, Visible Spectrum, Astronomical Spectroscopy, Image Intensifiers, Spectrum Analysis, Stellar Evolution

Scientific paper

Hα rotation velocities obtained from an echelle spectrogram to a radius of 2arcmin for the spiral galaxy NGC 3198 agree well with the 21 cm rotation velocities of van Albada et al. (1985). The rotation curve is typical of Sc type galaxies in spite of NGC 3198's extended H I disk. From optical R and Hα-emission images, used to search for star-forming regions in the outer parts of this galaxy, several Hα knots are identified as far out as the Holmberg radius. With increasing radial distance out to 2arcmin, the R-band surface brightness falls, the Hα is approximately constant, and the H I surface brightness rises.

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