Neutron Stars and Black Holes - Lecture 6: Pulsars and Their Properties
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Overview
Syllabus
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Neutron Stars and Black Holes Lecture - 6: Pulsars
The remarkable story of the Crab Nebula
Crab Nebula is expanding with a velocity ~ 1500 km per second
Continuous emission is strongly polarized
Expanding wisps near the center of the nebula
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
A Rotating Magnet will radiate
Meanwhile in Cambridge!
Scintillation, or twinkling' of compact radio sources
Jocelyn Bell
An unknown scintillating source
6 August 1967
Periodic pulsations discovered from the same source on 28 November 1967
The great discovery announced!
Micro structure of individual pulses
Coherence of the radio radiation
Brightness temperature limit
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
Average pulse profiles are unique to each pulsar. They are like their 'finger print'.
Micro structure of individual pulses
"Nulling" of pulsars
Neutron stars are powerful dynamos!
Pulsar electrodynamics
Magnetosphere of the neutron star
Light Cylinder
Radiation from an accelerated charge
Radiation from a relativistic charge
Radio radiation from pulsars
The Polar Cap Model for pulsars
A hollow cone of radiation
Pulsed emission from the CRAB Pulsar.
Pair creation
Next Lecture - Physical content of the General Theory of Relativity
Q&A
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International Centre for Theoretical Sciences