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Pulsars, Supernova Remnants and Radio Galaxies by Professor G Srinivasan

International Centre for Theoretical Sciences via YouTube

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Overview

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.

Syllabus

Summer course 2018 - A Random walk in astro-physics
Pulsars, Supernova Remnants and Radio Galaxies Lecture - 05
The remarkable story of the Crab Nebula
Guest Stars
Guest Star of 1054 A.D.
Line emission & Continuum emission
Continuous emission is strongly polarized
Expanding wisps near the centre of the nebula
Crab Nebula is expanding with a velocity approximate 1500 km per second
Acceleration of the nebula!
Radio emission from the Crab!
A great prediction by Shklovskii
Radio emission from the Crab Nebula is very strongly linearly polarized.
X-Ray emission from the nebula!
The great puzzle!
The great central engine
An extraordinary conjecture by Pacini!
Properties of neutron stars
Oscillating charge will radiate
Pulsars
Twinkle, twinkle little star
A video made with a TV camera showed that Baade's star pulsed with a period of 33 ms!
The great prediction by Franco Pacini
Neutron Stars as Pulsars
Neutron stars are powerful dynamos!
Pulsar electrodynamics
Magnetosphere of the neutron star
Light Cylinder
The Polar Cap Model for pulsars
Radio radiation from pulsars
A hollow cone of radiation
Radiation from a relativistic charge
Coherence of the radio radiation
Radio Galaxies and Quasars
The Radio Galaxy Cygnus A
Origin of the radio lobes
Jets discovered in Cygnus A
One sided jets
NGC 6251
Proper time:
Doppler Shift
Doppler favoritism
Superluminal motion
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.
Relativistic jets
Energy content
The central engine
Eddington Luminosity Limit
Variability of Quasars
Supermassive Black Holes
Next Lecture: Compton Scattering and Celestial Gamma Ray Sources
Q&A

Taught by

International Centre for Theoretical Sciences

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