PHYS 183 Lecture Notes - Lecture 23: Electromagnetic Spectrum, Electron Degeneracy Pressure, Crab Nebula
21 Apr 2018
School
Department
Course
Professor
Document Summary
Supported by neutron degeneracy pressure: analogy of electron degeneracy pressure but from neutrons. Mass ~1. 4 solar masses: observed range 1. 25-2 solar masses. Highest known density in universe except for black holes. Central density exceeds that in atomic nuclei by factor of ~10 at least. Nature of matter at these densities unknown. Named as first sketch looked like a crab. Was brighter than full moon for a month. Recorded in multiple records: chinese, korean, japanese. This is a pulsar: pulsates 30 times every second. Copious radio waves produced but emission across em spectrum. Neutron star mass: 1. 4 solar masses, about a half million earths. Birth surface temperature: ~2-3 million k. Typical neutron star magnetic field: 1012 g = 1012 ti(cid:373)es earth"s field. Fastest known pulsar rotates 716 times per second. White lines here represent magnetic field lines. Neutron stars embody extremes: gravity, density (>10x more nuclear, magnetic field, dynamics.
