Ch 15: Milky Way Galaxy Milky Way = “Via Lactea” spans many constellations Crosses the whole sky in a “great circle” Our view, from the inside, of our galaxy. All Sky SH NH (1) Optical/Infrared/Radio Optical: dust important IR & radio: true flatness revealed
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Milky Way = “Via Lactea” spans many constellations
Crosses the whole sky in a “great circle”
Our view, from the inside, of our galaxy.
Optical + molecular (CO)
Near Infrared: stars
Far Infrared: warm dust
8 kpc = 25,000 l-yr
However, problem with star counts: dust prevents clear view
Need tracer for galaxy outside dusty MW plane…..
(though 3x too big;
diagram labeled correctly)
All mass interior
Metal Rich (strong lines)
Metal Poor (weak lines)
MW plane(8) Galaxy Nucleus