DWARFS IN HIPASS AND SDSS Their properties merge smoothly with giants and show no extra Dark Matter
Jan 01, 2016
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.
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ΔV( )2
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ΔV( )2
Dwarfs v ClustersGilmore et al 2007
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M/L ratios in Dwarfs Gilmore 2007
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Montage of ES galaxies
SB v Col Density
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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.
Concentration v Mass
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HIMASS versus opt radius
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Colour v Luminosity
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Mass v Luminosity
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SB versus Luminosity
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Dynamical Mass v R(cubed)
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Correlation plot for 5 variables, not including colour
Principal Components for 5 variables, no colour
Correlations between 6 variables including colour
Principal components including colour
Simulation.2 variables correlated, the third is random
PCA of above. Note random varbl. has strong PC2
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.