Today in Astronomy 142: the Milky Way - Astro Pas Rochester

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Shapley and the location of the Galactic centerIn 1917, Harlow Shapley applied Henrietta Leavitt ‘spulsating-star distance-measurement discovery to thedistribution of globular clusters. He reasoned that theseclusters were so massive that they would accurately trace theGalaxy’s global gravitational potential.He found that these clusters were arranged sphericallysymmetrically about a point in the plane of the Milky Way, inthe constellation Sagittarius, tens of kpc away.! Modern measurements give 8.5 kpc for the distance.Thus the Sun is quite far from the center of the GalaxyAstronomy 142 2
The Milky Way’scentral regions, instarlight (nearinfrared),from theNASA COBEDIRBEexperiment.NGC 891, also instarlight (nearinfrared),from the2MASS survey (U.Mass./NASA).Astronomy 142 3
Page 1: Today in Astronomy 142: the Milky W
Page 5 and 6: HI observations of the LMCKim et al
Page 7 and 8: More edge-on galaxiesNGC 4217 (HST
Page 9 and 10: Schematic structure of the Milky Wa
Page 11 and 12: Motions of stars in the Galaxy, and
Page 13 and 14: Mass per unit area of the Galaxy’
Page 15 and 16: An easier way to estimate the force
Page 17 and 18: Dark matter I: the Galactic disk in
Page 19 and 20: Dark matter IIAstronomy 142 19
Page 21 and 22: Spiral structureAstronomy 142 21
Page 23 and 24: Density wave theory for spiral stru
Page 25 and 26: Spiral structureAstronomy 142 25
Page 27 and 28: X-shaped bulgeAstronomy 142 27

Today in Astronomy 142: the Milky Way - Astro Pas Rochester

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