Tests of the Fourier-quotient method

Details Tests of the Fourier-quotient method Tests of the Fourier-quotient method

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.2652l&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 90, Dec. 1985, p. 2652-2655.

Astronomy and Astrophysics

Astronomy

15

Elliptical Galaxies, Fourier Transformation, Galactic Rotation, Metallicity, Velocity Distribution, Least Squares Method, Noise Spectra, Stellar Spectra, Templates

Scientific paper

Tests of the Fourier-quotient method of determining rotation curves and velocity-dispersion profiles of galaxies, were performed in order to determine if the reported velocity dispersions are affected by metallicity. Synthetic spectra were used as templates. The effects of varying [Fe/H] on the velocity dispersion (σ) and "line-strength" parameter (γ) determined by the Fourier-quotient method were studied. Noise was not added to the spectra. The velocity dispersion varies by approximately 15% over the relative metallicity range studied, indicating that a small systematic error will arise due to changing metallicity. The line strength is strongly correlated with [Fe/H] as expected, but is also nearly independent of absolute metallicity.

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