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DWARFS IN HIPASS AND SDSS. Their properties merge smoothly with giants and show no extra Dark Matter. HOW MUCH GLOBAL INFORMATION/ GALAXY?. HOW MANY PHYSICAL PARAMETERS COULD CONTROL GALAXIES?
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DWARFS IN HIPASS AND SDSS Their properties merge smoothly with giants and show no extra Dark Matter
HOW MUCH GLOBAL INFORMATION/ GALAXY? • HOW MANY PHYSICAL PARAMETERS COULD CONTROL GALAXIES? • Total Mass, Baryon fract, Ang Mom,Radius, Concentration,Gas Mass,Age; ie SEVEN LESS 1 for Virial Theorem. Therefore SIX physical params. • HOW MANY INDEPENDENT OBSERVABLES CAN BE MEASURED? • Eg Lum, Radius, Concentration, M(HI), Internal Vel disp, Colour ……ie SIX too.
HOW MUCH INDEPENDENCE? • We find 200 objects in HI Blind survey coincident with SDSS images and correlate all the following props:Lum, Colour, Radius,M(HI), R(90)/R(50), and M(dyn). • Each indep correl must reduce 6 independent variables by 1. • We find 5 correls (one new).Thus HI selected Galaxies form a ONE PARAMETER SET. • This is confirmed by Principal Component Analysis.
HIMASS versus opt radius hdhdh
OBSERVE THE REAL SKY • This high degree of organisation is totally inconsistent with Hierarchical galaxy Formation.(at least 4) and mergers. • Galaxy astronomers should look at their observations free of prejudices drawn from cosmological simulations which look increasingly misleading! • Observations of Galaxies contain far more reliable information about the process of Gal formation than numerical simulations.