Lecture10 Black Hole2 - 4/6/09 1 (Hawley &...

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Unformatted text preview: 4/6/09 1 (Hawley & Holcomb, Chapter 9) Astronomy 309R - Spring 2009 [PowerPoint will be on Blackboard] How we realized whats going on in the centers of galaxies Why we realized that black holes were involved (variability) Rotating vs. non-rotating black holes How energy is produced (accretion disks) Estimating masses (light echoes) Quiescent black holes and the center of the Milky Way The structure of material around giant black holes And finally, what Dr. Milosalvjevi is up to this week! Binary black holes The maximum rate for growing black holes (Eddington limit) 4/6/09 Astronomy 309R - Spring 2009 2 Spectroscopy very rapidly moving gas in the nuclei of some galaxies (1908 E. A. Fath Lick Observatory) v ~ 0.02 c Broad lines Narrow lines Spectroscopy very rapidly moving gas in the nuclei of some galaxies (1908 E. A. Fath Lick Observatory) v ~ 0.02 c Broad lines Narrow lines Active Galactic Nuclei (AGNs) Growing evidence that weird things happen in the nuclei of galaxies: Intense concentrations of stars (William Herschel ~ 1890) e.g ., in Andromeda galaxy. Very rapidly moving gas v ~ 0.02 c (E. A. Fath 1908 Lick Observatory) 4/6/09 Astronomy 309R - Spring 2009 4 Active Galactic Nuclei (AGNs) Growing evidence that weird things happen in the nuclei of galaxies: Intense concentrations of stars (William Herschel ~ 1890) e.g ., in Andromeda galaxy. Very rapidly moving gas v ~ 0.02 c ( E. A. Fath 1908 Lick Observatory ) Jet coming out of giant elliptical M87 ( Heber Curtis 1912 Lick Observatory) 4/6/09 Astronomy 309R - Spring 2009 5 Active Galactic Nuclei (AGNs) Growing evidence that weird things happen in the nuclei of galaxies: Intense concentrations of stars (William Herschel ~ 1890) e.g ., in Andromeda galaxy....
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Lecture10 Black Hole2 - 4/6/09 1 (Hawley &...

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