lecture14 - Galaxies 3 basic types spiral thin disk w dust...

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Galaxies : 3 basic types : spiral --- thin disk w/ dust, gas and stars + older spherical star system elliptical --- older spheroidal star system (no interstellar gas/dust, no young stars) irregular --- irreg. shape , usually lots of gas evolution or initial conditions ?? Hubble sequence/classification <== tighter spiral <== larger bulge <== more spherical
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Normal spirals Barred spirals Sa (NGC 1357) SBa (NGC 4650) Sc (NGC 4321) Sb (M81) SBb (M83) SBc (NGC 1365)
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massive E0/1 galaxies at center of dense clusters, e.g. M87 Virgo => E3 (NGC 4365) E6 (NGC 3377) Ellipticals increasing ellipticity ==> Irregulars Irr (M82) dwarf (Sag) Interacting (NGC 4490) E0 (M87)
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galactic formation/evolution sequence proto-gal. gas cloud collapse due to self-gravity cons. of ang. mom. ==> spinup and flattening ==> remaining gas in disk first generation stars form w/ spherical distribution first gen. stars age (only red ones left) 2nd gen. *’s form in disk
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Alternative – hierarchical merging build up larger and larger galaxies by merging of smaller ones.
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