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Transcript 
Lecture 14:
Supermassive Black Holes
in Hibernation
Active and Normal Galaxies
A Starved SMBH in Our Galaxy
Chandra X-ray Image of Sgr A*
Some of the First Quasars in the Universe
Quasar Evolution Over Cosmic Time
Where are They Now?
SMBH Affecting Star Orbits at Galactic Center
Example of a Stellar Spectrum
The Andromeda Galaxy (M31)
Stellar Motions in Center of M31
Inferred SMBH mass is ~ 45 million solar masses.
The Sombrero Galaxy
Inferred SMBH mass is ~ billion solar masses.
Rotation of Gas Clouds in M87
Inferred SMBH mass is ~ 3 billion solar masses.
NGC 4258 – A Maser Disk Galaxy
Basic Idea of a MASER
Microwave Amplification by Stimulated
Emission of Radiation
The Very Long Baseline Array
Observed MASERS in NGC 4258
Model to Explain the MASER Observations
Inferred SMBH mass is 36 million solar masses.
Relations Between SMBHs and Host Bulges
Relations Between SMBHs and Host Bulges
Quasar Winds as a Source of Feedback?
Tidal Disruptions of Stars by SMBHs
Tidal Disruptions of Stars by SMBHs
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