AST201H1 Lecture Notes - Elliptical Galaxy, Starburst Galaxy, Centaurus A
20 Apr 2013
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AST201H1 Full Course Notes
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Bulge, disk, halo (all embedded in this; mostly empty) Three main types: spiral, elliptical (absence of spiral; giant bulges with no disk), irregular (miscellaneous category; look weird ) Sub-types, ex: barred, dwarf irregular, dwarf elliptical, lenticular, etc. Grand design spiral: m74: very famous galaxy, grand design because spiral is very obvious; fully fledged. Ring galaxy: hoag"s object: empty ring; nothing inside it. M64, black eye galaxy: gas spins in two directions (inside spins other way than outside, not unique; other galaxies do this too, may be result of collision. Ngc 4622: loose spiral, arms rotate the opposite way they appear to. Elliptical galaxy: judge bulge part of spiral galaxy. No disk shape; are spheres (or; ellipsoids) M87: very famous: giant elliptical galaxy, no dust, very massive, no new stars forming; very old. Ngc 5128: giant elliptical galaxy, has eaten a spiral galaxy and is absorbing its dust, super-massive black hole at centre, bipolar jets.
