Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-07-17
Astron & Astrophys, 343, 788-800, 1999
Astronomy and Astrophysics
Astrophysics
22 pages, 14 figures, A&A 1999
Scientific paper
The 900 ORCs of Mathewson, Ford & Buchhorn which were folded by Persic & Salucci (astro-ph/9502091) are analysed. A technique for removing that part of an ORC most dominated by the central region it introduced (see astro-ph/0107300 for a far more comprehensive discussion of this). The analysis then shows that a power-law model of the form V = A R^b, where the parameters (A,b) differ between ORCs, provides an extremely good description of the generic behaviour of ORCs when these central regions are removed. It is shown that a very powerful correlation exists between the free parameters (A,b), and that parameter A can be very accurately modelled in terms of the luminosity properties of galaxies. The net conclusion is that the power-law model is, at the very least, an extremely good first-order model for the behaviour of disc dynamics in the outer regions of ORCs.
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