LaTasha

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LaTasha

• In this presentation you will learn all about
  Quasar and Pulsar

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What is Quasar?

• Definition Quasar

When radio telescopes were first turned on the
heavens, point sources of radio waves were
discovered (along with spread-out regions of
emission along our Milky Way). Astronomers using
ordinary visible-light telescopes turned toward
these radio points and looked to see what was
there. In some cases a supernova remnant was
found, in others, a large star-birth region, in
others a distant galaxy.
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Do Quasars have anything to do with regular stars?

• No, except that quasars are in galaxies of stars.

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Are quasars related to pulsars? If so how?
A pulsar is a much smaller mass object, much
smaller in radius and not a black hole, but a
neutron star (it "failed" to become a black hole
during its birth due to a supernova explosion of
some single star). However, the neutron star is
nearly as compact as a black hole of that star's
mass. Magnetic fields near the blackhole and a
pulsar may be similar in structure and have
something to do with some energy output of each.
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How long does Quasars longs ?
It appears galaxies may only act as quasars
during the early stages of their lives, but it
would still be for times of billions of years.
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What is a Pulsar?
pulsars are rotating neutron stars. And pulsars
pulse because they rotate!
A diagram of a pulsar, showing its rotation
axis and its magnetic axis
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How long does it take for Quasars to form?
Nobody really knows, since we don't know exactly
how they form! However, it can't take much longer
than something like a billion years (the apparent
answer to all questions about cosmology!).
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Background About Pulsar
Discovered in late 1967 Jocelyn Bell Burnell
Radio sources that blink on and off at a
constant frequency. Ones at almost every
wavelength of light. Spinning neutron stars
Jets of particles moving almost at the speed
of light Streaming out above their magnetic
poles. Produce very powerful beams of light.
True north" and "magnetic north" are
different on Earth Magnetic and rotational axes
of a pulsar are also misaligned. Beams of light
from the jets sweep around as the pulsar rotates
like a lighthouse
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Pulsar
Crab on
X-ray Observations of Pulsars Some pulsars also
emit X-rays. Below, we see the famous Crab
Nebula, an undisputed example of a neutron star
formed during a supernova explosion. The
supernova itself was observed in 1054 A.D. These
images are from the Einstein X-ray observatory.
They show the diffuse emission of the Crab Nebula
surrounding the bright pulsar in both the "on"
and "off" states, i.e. when the magnetic pole is
"in" and "out" of the line-of-sight from Earth.
crab off
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Quasars Pulsars

• In this Presentation you should know all about
  Quasars And Pulsars.