Lecture10 Black Hole2

Lecture10 Black Hole2 - 1(Hawley& Holcomb Chapter 9...

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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 what’s 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 ć 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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This note was uploaded on 09/14/2009 for the course AST 309 taught by Professor Johnlacy during the Spring '08 term at University of Texas.

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Lecture10 Black Hole2 - 1(Hawley& Holcomb Chapter 9...

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