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lec35 - Lecture 35 Active Galaxies Structure and Central...

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Lecture 35 Active Galaxies: Structure and Central Engine Purdue University, Astronomy 364 1 Lecture 35
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Reminder The final exam will be on May 3 at 1-3pm in Rm 203 (PHYS). Issues of conflicts or special accommodations must be resolved by this Friday (April 22). No accommodation will be made after that. Lecture 32 Purdue University, Astronomy 364 2
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Summary: AGN Types Radio-Quiet AGN (~90%) Radio-quiet quasars Seyfert galaxies Seyfert 1: both narrow and broad emission lines Seyfert 2: only narrow emission lines Low-luminosity AGN Radio-Loud AGN (~10%) Radio-loud quasars: core dominated vs lobe dominated Radio galaxies Faranoff-Riley type 1 (FR 1): only narrow emission lines FR 2: both narrow and broad emission lines BL Lac Objects: very weak emission lines Optically Violent Variables (OVV) blazars
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Quiz Active galaxies are those galaxies that show unusually bright 1. Stars 2. Halos 3. Nuclei 4. Spiral arms 5. Disks 6. Bars Lecture 35 Purdue University, Astronomy 364 4
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Summary: AGN Properties Very small angular size High luminosity Outshines the host galaxy Broad-band continuum emission Strong emission lines: unlike stars or galaxies Broad lines Narrow lines Variability: some are highly variable Compact emission region Polarized emission Non-thermal synchrotron radiation Radio emission radio-loud vs radio-quiet
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AGN Unified Scenario - Supermassive black hole: - Thin accretion disk: optically thick - Disk “coronae”:
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