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Astro 220b:Galaxies and cosmology
Oct 11 2010
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blue
r
ed
faint bright
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Galaxies redder in regions of higher density
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Elliptical galaxiesredder thanspiral galaxies
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Apparent brightness +distance gives luminosity
Rotation curve:gives Vmax
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Absolute magnitude (=luminosity)
Max
imum
rot
atio
n ve
loci
ty (l
og)
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Velocity (km/s)
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Velocity (km/s)
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Num
ber
of g
alax
ies
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Visible lightMonday, October 11, 2010
X-ray
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Candidate for most distantknown object …
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