PCS 181 Lecture Notes - Lecture 7: Blue Giant, Irregular Galaxy, Neutrino
23 Apr 2016
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1054 ce, chinese guest star, as bright as our full moon could read at night! 1967: jocelyn bell (graduate student at cambridge) studying quasars. Detected rapid fluctuations in radio intensity every 1. 3 s. Pulsar=neutron star =collapsed core remnant of a supernova explosion. This tight ball of closely-packed neutrons is only approx. 20-100km across and has approx. same density as an atomic nucleus. A ns has other chars similar to atomic nuclei. A neutron star (ns)=compacted core of an exploded star that had a magnetic field. A neutron star has a strong magnetic field which directs charged particles to north or. Particles continually strike surface of ns, creating polar hot spots . These hot spots radiate over a wide range of wavelengths visible and invisible. If rotating ns is properly oriented with respect to earth, we detect beams of radiation emitted by hot spots . A pulsar is a neutron star but every neutron star is not a pulsar.
