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ASTR 2010 Cosmology

ASTR 2010 Cosmology. Week 11: Lecture 30 (5 Nov. 2012) black-holes, quasars, active galactic nuclei …. Active Galactic Nuclei (AGN) Quasars Seyferts radio galaxies. Black Holes.

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ASTR 2010 Cosmology

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  1. ASTR 2010 Cosmology • Week 11: • Lecture 30 (5 Nov. 2012) • black-holes, quasars, • active galactic nuclei …

  2. Active Galactic • Nuclei (AGN) • Quasars • Seyferts • radio galaxies

  3. Black Holes Super-massive black holes: (M > 106 - 1010 Mo ) Galactic cores => Formation in Big Bang? Gravitational collapse of proto-galaxies? Merging of stellar-mass black holes? - Quasars: (radio loud) - Radio galaxies - quasi-stellar objects (QSOs) (radio quiet) - Type I and Tpe II Seyfert galaxies L ~ 109 - 1015 Lo from regions < 1 pc is size Radio jets Variable X-ray & gamma ray sources

  4. Kerr black-hole: Rotation.Accretion of matter: jets from accretion disk surrounding black hole

  5. Galaxy collisions: dynamic friction starbursts => BHs, jets form during core collapse of massive star to black hole

  6. Centaurus A: nearest radio galaxy / AGN

  7. Centaurus A: IR

  8. Centaurus A: X-ray

  9. Centaurus A: composite

  10. M87: ellipticalradio galaxy / jet

  11. Radio Galaxy • Doppler boosting of jets

  12. Hydrogen spectrum: redshifted

  13. QSO spectra: redshifted

  14. Barred Spiral : NGC1097 HST

  15. Hydrogen spectrum: redshifted

  16. AGN spectra: BL Lac, Seyfert I, II, LINERs, BLRG, NLRG

  17. Lyman- forest: red shifted H n = 2 -> 1

  18. ASTR 2010 Cosmology • Week 11: • Lecture 31 (7 Nov. 2012) • Midterm Review

  19. Lyman- forest: red shifted H n = 2 -> 1 Lower Z neutral H in front of QSO absorbs ! Z = 4.2

  20. Lyman- forest: red shifted H n = 2 -> 1 Lower Z neutral H in front of QSO absorbs ! Z = 6.8

  21. AGN spectra: X-rayto radio !

  22. AGN spectra: X-rayto radio !

  23. The entire Sky at Infrared Wavelengths:

  24. Cosmic Microwave Background (Our Cosmic Horizon) 2.73 K Black Body Remove constant background (2.728 K): => Sun’s motion ~ 600 km/s toward Virgo (Doppler shift)

  25. Cosmic Microwave Background (CMB) Remove Solar motion CMB + Galactic Plane dust Remove model of dust emission => True CMB

  26. Cosmic Microwave Background (Wilkinson Microwave Anisotropy Probe - WMAP) The Universe 380,000 yrs after Bib Bang (13.7 billion years ago!) Then: 1/2 temperature of Sun’s surface Today: 3 C above absolute 0!

  27. The Cosmic Microwave Background

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