ASTRO-110 Chapter Notes - Chapter 9: Supermassive Black Hole, Seyfert Galaxy, Accretion Disk
Document Summary
Quasars are the brightest of an entire class of phenomena associated with unusually bright and energetic galactic centers active galactic nuclei. Some present day (i. e. old) galaxies look like weak quasars. Called seyfert galaxies, they emit energy from their core over a very broad range of frequencies. Agn sometimes manifest themselves as radio galaxies. Radio galaxies emit unusually large quantities of radio waves. Sometimes we see a bright radio source at the center of the galaxy with a more diffuse halo of radio energy surrounding it. All agn exhibit emissions consistent with bipolar outflows of material and with a very compact and powerful energy source. Whether we see a radio galaxy, an agn, a quasar or even a blazar depends on our viewing angle relative to the jet. We can"t see all the way back to the birth of our universe. We must build models of the early universe and make predictions.
