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PCS 181 Lecture Notes - Sn 1987A, Large Magellanic Cloud, Irregular Galaxy

Course Code
PCS 181
Margaret Buckby

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Pulsation Explanation
A neutron “star” (NS) = compacted core of an exploded sstar that had a magnetic field.
A neutron “star” has a strong magnetic field which directs charged particles to the North of South poles.
The particles continually strike the surface of the NS creating polar “hot spots”.
These “hot spots” radiate over a wide range of wavelengths … visible and invisible
If the rotating NS is properly oriented with respect to Earth, we detect the beams of radiation emitted
by the “hot spots
This is the “Lighthouse Effect”
We call the object a “pulsar”
SuperNova 1987A
Discovered / reported from Chile by Ian Shelton, an observer from the University of Toronto
SN1987A occurred in the Large Magellanic Cloud = an irregular galaxy near MW at ~170,000 ly distance
The progenitor star was a blue giant star, Sanduleak
Huge neutrino bursts detected by Earth-based equipment
The particular SN event has been studied from the actual explosion to the present day.
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