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Lecture18 - Previous Lecture Disk Galaxy Rotation Curves...

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Previous Lecture Disk Galaxy Rotation Curves shape: flat at large radii amplitude: 100 – 300 km/s, depending on mass determines total mass and mass distribution Milky Way Data r Sun = 8 kpc v cir, Sun = 220 km/sec P Sun = 2x10 8 yr Spiral Structure possibly a long-lived density wave possibly temporary but repeating structures Milky Way Center 4x10 6 M sun black hole
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Galaxies 1920: Shapley-Curtis Debate concerning the nature of the “nebulae” clouds in the Milky Way or other “Island Universes” Shapley (local clouds, big Galaxy) had better arguments than Curtis (other galaxies, Kapteyn MW) observations in the 1920’s showed that Curtis’ view was more correct – the nebulae were other galaxies antwrp.gsfc.nasa.gov/diamond_jubilee/debate20.html We live in a vast universe of galaxies
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Galaxy Types Basic classification system by Hubble Spirals (or disks) like the Milky Way Ellipticals – relatively featureless blobs Irregulars – complex shapes “Tuning Fork” diagram
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Spiral Galaxies normal barred Sa
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