Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.202.1001b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 202, Mar. 1983, p. 1001-1013.
Astronomy and Astrophysics
Astronomy
16
Active Galaxies, Astronomical Spectroscopy, Elliptical Galaxies, Emission Spectra, Galactic Nuclei, Galactic Structure, Velocity Distribution, Angular Velocity, Ionized Gases, Lenticular Bodies, Stellar Spectrophotometry, X Ray Sources
Scientific paper
The velocity field of the emission line elliptical/lenticular galaxy NGC 3998 has been measured using a total of seven long-slit spectrograms in five position angles. A rotating and expanding, flattened distribution of gas is suggested. The kinetic energy of the expanding material is 1053 - 1054 erg, indicating pronounced nuclear activity. Spectrophotometry of the nucleus of NGC 3998 has revealed emission line strengths characteristic of shocks rather than photoionization. The mass of ionized gas within 0.2 kpc radius is 2×105M_sun;. Both the stars and the gas have central velocity dispersions of 260 km s-1. The high rotation velocity of the stars suggests that NGC 3998 is a lenticular rather than an elliptical galaxy. The mass within the 20 arcsec (1.2 kpc) maximum radius of the rotation curve is ≡1010 M_sun; and the mass-to-B-light ratio is ≡3.
Blackman C. P.
Ward Martin J.
Wilson Andrew S.
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