Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...180...57g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 180, no. 1-2, June 1987, p. 57-64.
Astronomy and Astrophysics
Astrophysics
6
Astronomical Photometry, Galactic Rotation, Luminosity, Spiral Galaxies, Angular Velocity, Hydrogen, Magnitude, Wave Scattering
Scientific paper
The effect of excluding the B-band luminosity of the outer parts of spiral galaxies on the Tully-Fisher relation, has been investigated. The following results have been obtained: The correlation of the Tully-Fisher diagram is improved as we go from total luminosity BT0, to fractional luminosity B-0.50 measured at an aperture ratio log A/D(0) = -0.5, and then to fractional luminosity in the B-band, V-0.50 but, because the slope increases, the scatter in magnitude is almost the same (the scatter in rotation velocity at a given magnitude decreases). The dispersion of the Tully-Fisher relation seems to reach a minimum near an aperture ratio of log A/D(0) ≈ -0.6 ≡ -0.5 which is aproximately the position where solid body rotation drops and the curve flattens out in many galaxies.
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