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Galaxy Rotation vs Redshift
In article ,
(Charles R Kiss) writes: I downloaded the rotation rates, optical radius, and redshift, of 80 galaxies. The data of these 80 galaxies were retrieved objects from Persic and Salucci via Matthewson [ca.1997]. I determined the ratio: rotation rate/optical radius and plotted the result against their respective redshift, obtaining what appears to be a linear graph. Doesn't this mean: Vrot/Ropt = K*Vsys? If I understand you correctly, the above can be rearranged as Vrot/D = Ropt, where D is distance in some (probably strange) units. In other words, galaxy angular diameter increases with mass (which is proportional to some power of Vrot) and is inversely proportional to distance. This is pretty crude and can no doubt be refined, and I haven't looked at your input data at all, so perhaps it's wrong altogether. It's just the first thought that comes to mind. -- Steve Willner Phone 617-495-7123 Cambridge, MA 02138 USA (Please email your reply if you want to be sure I see it; include a valid Reply-To address to receive an acknowledgement. Commercial email may be sent to your ISP.) |
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