22_-_The_Sag_A_Saga - 22 - The Sag A* Saga: the Black Hole...

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22 - The Sag A* Saga: the Black Hole in the Center of the Galaxy Andrea Ghez 2 Black Holes • Predicted by Einstein’s General Relativity. • First observed in binary star systems. • Most (all?) spiral galaxies have a massive black hole in their center. • Many elliptical galaxies have them as well. • The Milky Way BH has a mass of 4x10 6 Mo • There is a relation between the bulge mass and the BH mass. • There may be a huge number of stellar mass black in our galaxy. 3 Cyg-X1 (the first BH) A one star binary! 4 Measuring Mass • Many stellar mass BH exist in our galaxy. • Easiest to measure Doppler shift accurately when X-rays are not heating the accretion disk
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5 An Active Galactic Nucleus 6 The Process Becomes Very Complex 7 The “near in” View of the Galactic Center This is the normal solid- body rotation curve! 8 Components of the Galactic Center • Sgr A • Sgr A* Image courtesy of NRAO/AUI and N.E. Kassim, Naval Research Laboratory
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9 Components of the Galactic Center
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This note was uploaded on 04/05/2009 for the course ASTRO 3332 taught by Professor Houck,j during the Spring '09 term at Cornell University (Engineering School).

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22_-_The_Sag_A_Saga - 22 - The Sag A* Saga: the Black Hole...

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