AGN

By:

Kyle Horvath

Active Galactic Nuclei

• Galaxies that release massive amounts of energy.

• They are extremely luminous.

• Emit radio waves and visible light.

• AGN are usually classified into Quasars, Blazars, Radio Galaxies, and Starburst Galaxies, and Seyfert Galaxies.

AGN Structure

• Super massive Black Holes in the middle.

• Black Holes are surrounded by the accretion disks.

• Then the torus surrounds that.

• Two relativistic jets .

Super Massive Black Holes• A gravitational field in space so strong not even light

can escape it.• The event horizon is the area which not even light can

escape.

Red Shift

• Electromagnetic radiation that is shift towards red end of the spectrum

• Red shift changes due to the expansion of the universe

• Used in AGN to calculate distance, luminosity, velocity, and more.

Quasar

• The oldest and furthest galaxies in our universe.

• Extremely bright.• Highly red

shifted.

Seyfert Galaxies

• Bright Emission lines

• Produce spectral line emission

• Have types 1 and 2

• Type 1 has both broad and narrow

• Type 2 has just narrow

BL Lac/Blazars

• High energy galaxies

• Its spectrum is void of emission and absorption lines.

• Only telluric bands are visible.

• Thought to be looking at galaxies through its jets.

Why Use AGN?

• AGN are typically extremely luminous optically and in radio.

• Astronomers use AGN to understand galactic evolution.

• They hope to predict the future of our on galaxy through AGN.

• Also through study astronomers can hypothesize the creation of the universe.

AGN IN SJHSRC

• In class we look through spectroscopy of AGN

• We use Graphical Analysis

• “In theory” ~Doc.Laug, we can gain insights on how our universe was created and how its evolving.