Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.223..303p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 223, NO.2/NOV15, P. 303, 1986
Astronomy and Astrophysics
Astronomy
10
Scientific paper
The authors show that important information on both global and local properties of spiral galaxies reside in the gradient of their circular velocity and can be obtained from the quantity V ≡ (Ω-K/2)R. This quantity V is always found to be practically constant over the whole star disc even for steep rotation curves (relative variations ⪉1 per cent). In particular the jump which is naturally expected to mark the transition between the halo-dominated and disc-dominated regions is not found in any galaxy, and this must be considered as a main observational test for theories on late stages of galaxy formation. V is found to drive integral properties such as density, size, luminosity and neutral hydrogen content and to be theoretically linked with the logarithmic gradient of crucial local quantities. Finally the authors show that the frequency Ω-K/2 exhibits, at least for Sb and Sc galaxies, a simple regularity and a common value.
Persic Massimo
Salucci Paolo
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