Formation, Fueling, and Feedback from Supermassive Black Holes - Lecture 2

Delve into the physics of supermassive black holes in this comprehensive lecture aimed at graduate students. Explore current theories on the formation of seed black holes, accretion processes driving their growth, and the impact on their surrounding environment. Learn about modeling techniques including analytic, numerical, and semi-empirical approaches guided by observational data. Examine accretion disc structure, thin accretion discs, viscosity, and disc timescales. Investigate the Eddington limit, super-Eddington accretion, and the cosmological picture of black hole growth. Discover the relationship between galaxies and their central supermassive black holes, active galactic nuclei (AGN) spectra, and jet formation. Analyze black hole scaling relations and trace the globally averaged black hole accretion rate over cosmic time. Conclude with a discussion of current open questions in black hole physics and participate in a Q&A session.

Formation, Fueling, and Feedback from Supermassive Black Holes Lecture 2
accretion disc structure
Thin Accretion Discs
Viscosity
Net torque on disc ring between R, R +
Remaining term represents dissipation:
Assume now that disc matter has a small radial velocity VR
For accretion disc equations etc
Steady thin discs
Putting this in the equation for sigma and using the Kepler form of angular velocity we get
Now if disc optically tick and radiates roughly as a blackbody,
Condition for a thin disc HR
Disc timescales
size of AGN disc set by self gravity
central object gains a.m. and spins up at rate
accretion to central object
motion near a point mass
motion near a black hole
where are the holes? dynamical friction
dynamical friction
centre of Milky Way
spinning Kerr black hole
Eddington limit
Can a black hole ignore the Eddington limit?
Super-Eddington Accretion
cosmological picture of growth: big galaxy swallows small
galaxy knows about central SMBH
how?
well....
LECTURE 2: OUTLINE
Accretion Disk Structure & Emergent Spectrum
Disk Temperature
Disk Spectrum
Emission from AGN
Active Galactic Nuclei AGN
The Lay of the Land
AGN spectrum: broad-band + variability
Accretion Disk Corona & Torus
Broad & Narrow Absorption-Lines
Radio Galaxies and Jets
Jets: Focussed Streams of Ionized Gas
Thin discs?
Viscosity
Black Holes Scaling Relations
Globally averaged BHAR traces over cosmic time
Understanding Mbh - sigma
Q&A