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Pulsars, Supernova Remnants and Radio Galaxies (Lecture – 05) by Professor G Srinivasan

4,655 views · Published 1 June 2018 · 2:08:39 · Indexed 25 September 2026

Channel: International Centre for Theoretical Sciences · 2018 · Science & Technology

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Summer course 2018 - A Random walk in astro-physics

Lecture - 05 : Pulsars, Supernova Remnants and Radio Galaxies 
by Professor G Srinivasan, Raman Research Institute (Retired)

10.00 to 12.00 Friday, 18 May 2018
Madhava Lecture Hall, ICTS Bangalore

The range of densities, temperatures, magnetic fields, etc. that obtain in the Universe are staggering: from 10-27 g cm-3 to 1015 g cm-3, from 3K to 1010 K, from 10-6 G to 1015 G. Not surprisingly, the variety of physical phenomena one encounters during the study of celestial objects is truly impressive. This set of lectures is intended to illustrate the richness of Astrophysics. It will be a random walk in basic physics, with numerous illustrations from astronomy. The topics in physics that will be reviewed have been chosen on the basis of their importance in contemporary astronomy.

Topics:

Absorption and emission of radiation
Radiation from relativistic electrons
Compton scattering of radiation
Spontaneous and stimulated emission
Hyperfine splitting of energy levels
Molecular spectra
Astrophysical plasma.
Quantum tunnelling.
Nuclear matter
Neutrino Oscillation
Phase transitions and the early Universe
During this random walk in physics, one will encounter a range of astronomical objects and phenomena, such as, Solar wind, gaseous nebulae, interstellar hydrogen clouds, giant molecular clouds, neutron stars and pulsars, supernova remnants, radio galaxies and quasars, active galactic nuclei, the cosmic microwave background, etc.

https://www.icts.res.in/summercourse2018

Table of Contents (powered by https://videoken.com)
0:00:00 Summer course 2018 - A Random walk in astro-physics
0:00:10 Pulsars, Supernova Remnants and Radio Galaxies (Lecture - 05)
0:01:07 The remarkable story of the Crab Nebula
0:01:42 Guest Stars
0:04:13 Guest Star of 1054 A.D. 
0:05:07 Line emission & Continuum emission 
0:07:03 Continuous emission is strongly polarized
0:07:43 Expanding wisps near the centre of the nebula
0:08:43 Crab Nebula is expanding with a velocity approximate 1500 km per second 
0:10:10 Acceleration of the nebula!
0:14:20 Radio emission from the Crab!
0:19:44 A great prediction by Shklovskii
0:21:23 Radio emission from the Crab Nebula is very strongly linearly polarized.
0:21:55 X-Ray emission from the nebula!
0:25:40 The great puzzle!
0:26:39 The great central engine
0:27:24 An extraordinary conjecture by Pacini!
0:28:43 Properties of neutron stars
0:31:09 Oscillating charge will radiate
0:32:55 Pulsars
0:33:34 Twinkle, twinkle little star 
0:35:47 A video made with a TV camera showed that Baade's star pulsed with a period of 33 ms!
0:36:32 The great prediction by Franco Pacini
0:37:23 Neutron Stars as Pulsars
0:37:43 Neutron stars are powerful dynamos!
0:43:21 Pulsar electrodynamics
0:47:30 Magnetosphere of the neutron star
0:49:28 Light Cylinder
0:53:07 The Polar Cap Model for pulsars
0:58:04 Radio radiation from pulsars
0:58:15 A hollow cone of radiation
0:58:39 Radiation from a relativistic charge
0:58:46 Coherence of the radio radiation
1:02:26 Radio Galaxies and Quasars
1:04:24 The Radio Galaxy Cygnus A
1:12:50 Origin of the radio lobes
1:16:38 Jets discovered in Cygnus A
1:19:56 One sided jets
1:20:28 NGC 6251
1:22:53 Proper time:
1:24:53 Doppler Shift
1:32:27 Doppler favoritism
1:37:53 Superluminal motion
1:38:49 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.
1:45:11 Relativistic jets
1:47:15 Energy content
1:50:21 The central engine
1:51:15 Eddington Luminosity Limit
1:58:06 Variability of Quasars
2:02:16 Supermassive Black Holes
2:03:39 Next Lecture: Compton Scattering and Celestial Gamma Ray Sources 
2:04:23 Q&A

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