Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...117..257l&link_type=abstract
Astronomy and Astrophysics, vol. 117, no. 2, Jan. 1983, p. 257-264.
Astronomy and Astrophysics
Astrophysics
15
Astrometry, Data Correlation, Elliptical Galaxies, Galactic Rotation, Velocity Distribution, Astronomical Spectroscopy, Autocorrelation, Cross Correlation, Fourier Analysis, Galactic Evolution, Line Spectra, Optical Emission Spectroscopy, Spectral Energy Distribution
Scientific paper
Velocity dispersions and rotation curves are measured for the lenticular galaxy NGC 3115, and the three elliptical galaxies NGC 4472, 4697, and 4296, using the Fourier quotient, cross correlation and autocorrelation methods. The results of the three methods are found to be in good agreement, and it is demonstrated that the Fourier quotient method's correlation between velocity dispersion variations and the line strength parameter is not necessarily physical, but an inherent property of the method due to correlation of the error of the velocity dispersions and the error of the line strength parameter. The low rotational velocities found earlier for elliptical galaxies are confirmed, and no indication is found of a radial dependence in the present galaxies' velocity dispersions.
Dickens R. J.
Kjaergaard Per
Larsen Nadia
Norgaard-Nielsen Hans Ulrik
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