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Summer course 2018 - A Random walk in astro-physics
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Pulsars, Supernova Remnants and Radio Galaxies Lecture - 05
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The remarkable story of the Crab Nebula
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Guest Stars
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Guest Star of 1054 A.D.
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Line emission & Continuum emission
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Continuous emission is strongly polarized
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Expanding wisps near the centre of the nebula
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Crab Nebula is expanding with a velocity approximate 1500 km per second
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Acceleration of the nebula!
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Radio emission from the Crab!
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A great prediction by Shklovskii
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Radio emission from the Crab Nebula is very strongly linearly polarized.
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X-Ray emission from the nebula!
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The great puzzle!
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The great central engine
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An extraordinary conjecture by Pacini!
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Properties of neutron stars
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Oscillating charge will radiate
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Pulsars
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Twinkle, twinkle little star
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A video made with a TV camera showed that Baade's star pulsed with a period of 33 ms!
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The great prediction by Franco Pacini
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Neutron Stars as Pulsars
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Neutron stars are powerful dynamos!
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Pulsar electrodynamics
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Magnetosphere of the neutron star
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Light Cylinder
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The Polar Cap Model for pulsars
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Radio radiation from pulsars
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A hollow cone of radiation
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Radiation from a relativistic charge
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Coherence of the radio radiation
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Radio Galaxies and Quasars
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The Radio Galaxy Cygnus A
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Origin of the radio lobes
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Jets discovered in Cygnus A
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One sided jets
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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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Superluminal motion
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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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Relativistic jets
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Energy content
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The central engine
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Eddington Luminosity Limit
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Variability of Quasars
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Supermassive Black Holes
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Next Lecture: Compton Scattering and Celestial Gamma Ray Sources
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Q&A
Description:
Embark on a captivating journey through the cosmos in this comprehensive lecture on pulsars, supernova remnants, and radio galaxies. Explore the remarkable story of the Crab Nebula, delve into the properties of neutron stars, and unravel the mysteries of pulsar electrodynamics. Discover the fascinating world of radio galaxies and quasars, including the iconic Cygnus A. Learn about relativistic jets, superluminal motion, and the concept of Doppler favoritism. Investigate the energy content of celestial objects, the central engines powering these phenomena, and the Eddington Luminosity Limit. Gain insights into the variability of quasars and the existence of supermassive black holes. This lecture, part of the "Summer course 2018 - A Random walk in astro-physics" series, offers a comprehensive exploration of astrophysical concepts, combining theoretical knowledge with observational evidence to paint a vivid picture of the universe's most extreme objects.

Pulsars, Supernova Remnants and Radio Galaxies by Professor G Srinivasan

International Centre for Theoretical Sciences
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#Science #Astronomy #Astrophysics #Pulsars #Physics #Particle Physics #Neutrino Oscillations
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Summer course 2018 - A Random walk in astro-physics