Lecture17-1 - AstroNova “Old” sunspots observed NASA...

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Unformatted text preview: AstroNova “Old” sunspots observed NASA not cutting off Mars rovers Saturn’s moon Titan rotation surprises Axis tipped 0.3º Rate 0.004% fast, and increasing Effect of winds? Evidence for oceans 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 Quiz Question #1 What is the source of the energy that creates the hot intercloud medium? A. ultraviolet radiation from O and B type stars B. shock waves from supernova explosions C. infrared radiation from protostars D. the flip of an electron’s spin in a hydrogen atom E. accretion disks around massive black holes 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 Huchra’s Lens Galaxy H α Spectra H α Rotation Curve Approaching side Receding side Littrow ghost NII - to come! H α Rotation Curve Trott & Webster 2002 model RC bulge bar disk halo constrained by lensing constrained by disk kinematics HI data H α Rotation Curve model RC bulge bar disk halo constrained by lensing constrained by disk kinematics Trott & Webster 2002 Model doesn’t fit H α RC points Stellar Motion in Milky Way Disk...
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Lecture17-1 - AstroNova “Old” sunspots observed NASA...

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