Chapter 22: Peculiar and Unusual Extragalactic Objects

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Chapter 22 Peculiar and Unusual Extragalactic
Objects
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The Peculiar Galaxy VV72
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Double-Lobed Radio Galaxy
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Radio Observation
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Cen A
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Cen A
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Structures within Cen A
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M87

• Short exposure ground-based image
• High resolution Hubble image
• A giant elliptical galaxy
• Jet

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M87
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Sizes of Radio Galaxies
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Seyfert Galaxy NGC 1068
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Seyfert Galaxy Spectrum

• Emission lines
• High redshift (H?rest wavelength6563Å)

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Center of Seyfert Galaxy NGC 1068
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Quasar
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High Redshift Quasar
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Quasar Central Black Hole
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Quasar fuzz
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Quasar Gravitational Lens

• Lensing galaxy in the center
• Other images are lensed images of distant quasar

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Gravitational Lensing
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Gravitational Lens Einstein Ring
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M87 Nucleus and Black Hole
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Core of NGC 4261

• 300 light-year disk surrounding bright spot that
  might have a supermassive black hole
• Radio observations show radio lobes perpendicular
  to disk

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Model of Radio Galaxies
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Practice Problems

• Summary Questions 2, 3, 4, 6, 7
• Applying Your Knowledge 2