Lecture17

Lecture17 - Previous Lecture Interstellar Medium Gas:...

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Unformatted text preview: Previous Lecture Interstellar Medium Gas: Clouds and Intercloud H II Regions H I Clouds Giant Molecular Clouds Hot and Warm intercloud medium Dust Dark nebulae and diffuse dust Causes absorption and reddening Star Clusters: Galactic and Globular Stellar Motions in the Milky Way Organized large-scale rotation about center Rotation curve is plot of rotation speed as a function of distance from the galaxy center typical rotation curves rise linearly from the center, then flatten off to the limits of observation determined by optical observations of gas (HII regions and hot diffuse gas), stars (difficult), and by radio 21-cm observations of gas (most extensive but lower resolution) NGC 4123 Rotation Curve 21-cm H I observations SALT Observations Huchras Lens Galaxy H Spectra H Rotation Curve Approaching side Receding side Littrow ghost NII - to come! H Rotation Curve Trott & Webster 2002 model RC bulge bar disk halo constrained by lensing constrained by disk kinematics HI data H Rotation Curve model RC bulge bar disk halo constrained by lensing constrained by disk kinematics Trott & Webster 2002 Model doesnt fit H RC points Stellar Motion in Milky Way Disk...
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This note was uploaded on 01/31/2012 for the course 750 110 taught by Professor Ericgawaiser during the Fall '10 term at Rutgers.

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Lecture17 - Previous Lecture Interstellar Medium Gas:...

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