Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...142....1k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 142, no. 1, Jan. 1985, p. 1-8. Research supported by the Nederlandse Organisat
Astronomy and Astrophysics
Astrophysics
44
Disk Galaxies, Galactic Structure, Gas Dynamics, Hydrogen Clouds, Lenticular Bodies, Active Galaxies, Angular Velocity, Annuli, Astronomical Maps, Emission Spectra, Galactic Bulge, Kinematics
Scientific paper
Synthesis observations of H I in the active S0 galaxy NGC 3998 show that the gas is in a polar ring, inclined about 80° to the optical major axis. The position angle of the ionized gas in the inner galaxy is intermediate between those of H I and the light, suggesting differential precession of the gas structure. Weak extensions on the radio continuum emission from the nucleus are roughly perpendicular to the inner gas distribution. The circular velocity derived from the H I is normal for a galaxy of this luminosity; however, the ratio of central bulge velocity dispersion to circular velocity is anomalously high. This, and the extreme central light concentration, suggest that the galaxy contains a central massive object.
Driel Wim van
Knapp Gillan R.
van Woerden Hugo
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