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Date: Wed, 26 June 2019, 10:00 to
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Neutron Stars and Black Holes Lecture -13: The Realm of the Supermassive Black Holes
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Realm of the Supermassive Black Holes
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The Radio Galaxy Cygnus A
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Cliff top Interferometer
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Intensity Interferometer
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Hanbury-Brown & Twiss Intensity Interferometer
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Michelson Interferometer
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Intensity Interferometer of Hanbury-Brown
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The Radio Galaxy Cygnus A
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Quest for high angular resolution
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Origin of the radio lobes
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Jets discovered in Cygnus A
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Very Long Baseline Interferometry
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The Global VLBI-Array
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CYGNUS A
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One sided jets
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M 87 The giant elliptical
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NGC 6251
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Proper time:
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Doppler Shift
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Doppler favoritism
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Imagine a black hole at position A ejecting a blob in direction making an angle theta to the observer. Let the blob be moving with velocity v.
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Superluminal motion
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Apparent transverse velocity as a function of beta and theta
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Superluminal Motion in the M87 Jet
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To achieve sub-milli arc second resolution one uses intercontinental baseline interferometry.
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Relativistic jets
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Energy content in the radio lobes
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Energy content
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The central engines
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Eddington Luminosity Limit
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Thompson scattering cross section:
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Variability of Quasars
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Supermassive Black Holes
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Accretion onto Supermassive Black Holes
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Evidence for supermassive Black Holes
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NGC 4258
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Mega MASERS in NGC 4258
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Stars orbiting the Galactic Centre Black Hole
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Black Hole at the centre of Milky Way
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The giant black hole at the center of M 87
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M87 Base of Jet
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Angular resolution required to resolve the event horizon of the central BH
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VLBI at 1.3 mm
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Event Horizon Telescope
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VLBI at 1.3 mm with the EHT
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Environment of the Black Hole
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What does one expect to see with the EHT?
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Motion of light near a nonrotating BH
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What does one expect to see?
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Comparison with simulations suggests that the torus is rotating CLOCKWISE around the spin axis of the BH
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Summary of the conclusions
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Has General Relativity finally been verified to a satisfactory extent?
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S. Chandrasekhar:
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X-Ray interferometry - in the near future - and, to a lesser extent, space based GW detectors hold out tantalizing prospects
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Formation of supermassive black holes
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Mergers
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How did the original BHs form?
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Supermassive stars
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Stability of Matter
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Stability of a star in General Relativity
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Stability of a supermassive star in General Relativity
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Next Lecture - Universe or Multiverse?!
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Q&A
Description:
Explore the fascinating realm of supermassive black holes in this comprehensive lecture by G. Srinivasan from the Raman Research Institute. Delve into the history of quasar discovery and their incredible luminosity, learn about radio galaxies with powerful relativistic jets, and understand how observations led to the conclusion that active galactic nuclei are powered by supermassive black holes. Examine the evolution of our understanding of these cosmic giants, from early radio astronomy techniques to modern very long baseline interferometry. Discover the physics behind relativistic jets, superluminal motion, and accretion onto supermassive black holes. Investigate the evidence for their existence in various galaxies, including our own Milky Way. Gain insights into the groundbreaking work of the Event Horizon Telescope and its imaging of the M87 black hole shadow. Discuss the formation and stability of supermassive black holes, and contemplate future prospects in X-ray interferometry and gravitational wave detection. This pedagogical talk assumes no prior knowledge and concludes with a Q&A session. Read more

The Realm of Supermassive Black Holes - Lecture 13

International Centre for Theoretical Sciences
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#Science #Astronomy #Astrophysics #Supermassive Black Holes #Quasars #Active Galactic Nuclei
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Date: Wed, 26 June 2019, 10:00 to