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Time: AM
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A Journey through the Universe
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Pulsars Lecture - 08
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The remarkable story of the Crab Nebula
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Crab Nebula is expanding with a velocity ~ 1500 km per second
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LINE emission & Continuous 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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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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A Rotating Magnet will radiate
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An extraordinary conjecture by Pacini!
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Meanwhile in Cambridge!
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Scintillation, or twinkling' of compact radio sources
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Jocelyn Bell
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An unknown scintillating source
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6 Auguest 1967
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Periodic pulsations discovered from the same source on 28 November 1967.
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The great discovery announced!
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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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Average pulse profiles are unique to each pulsar. They are like their 'finger print'.
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Micro structure of individual pulses
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"Nulling" of 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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Radiation from an accelerated charge
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Radiation from a relativistic charge
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Synchrotron Radiation
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Radio radiation from pulsars
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The Polar Cap Model for pulsars
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A hollow cone of radiation
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Pulsed emission from the CRAB Pulsar.
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Radiation from a relativistic charge
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Pair creation
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Coherence of the radio radiation
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Brightness temperature limit
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Q&A
Description:
Explore the fascinating world of pulsars in this comprehensive lecture by Professor G Srinivasan, part of a summer course on gravity, astrophysics, and cosmology. Delve into the remarkable story of the Crab Nebula, understanding its expansion, emission properties, and the puzzling acceleration of its wisps. Discover the groundbreaking predictions and conjectures that led to the discovery of pulsars, including Pacini's extraordinary hypothesis and Jocelyn Bell's serendipitous detection. Examine the unique characteristics of neutron stars as pulsars, their electrodynamics, and magnetosphere. Investigate the complex mechanisms behind pulsar radiation, from synchrotron radiation to pair creation. Gain insights into the polar cap model, coherence of radio radiation, and the concept of brightness temperature. Conclude with a Q&A session to further explore this captivating topic in astrophysics.

Pulsars: Properties, Radiation, and Discovery - Lecture 8

International Centre for Theoretical Sciences
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