On November 28, 1967, Jocelyn Bell Burnell and Anthony Hewish discovered the first Pulsar, a fast rotating neutron star that emits a beam of electromagnetic radiation. The radiation of a pulsar can only be observed when the beam of emission is pointing toward the Earth, much the way a lighthouse can only be seen when the light is pointed in the direction of an observer, and is responsible for the pulsed appearance of emission.
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F. Christensen, and B. Ramsey. (2022)cite arxiv:2207.00512Comment: 45 pages, 21 figures. Invited chapter for the 'Handbook of X-ray and Gamma-ray Astrophysics (Eds C.Bambini and A Santangelo, Springer Singapore, expected publication in 2022).
T. Siegert, D. Horan, and G. Kanbach. (2022)cite arxiv:2207.02248Comment: 75 pages, 25 figures, 1 table, accepted for the Handbook of X-ray and Gamma-ray Astrophysics.
R. Amorín, J. Vílchez, and E. Pérez-Montero. (2011)cite arxiv:1105.1477Comment: To appear in JENAM
Symposium "Dwarf Galaxies: Keys to Galaxy Formation
and Evolution", P. Papaderos, G. Hensler, S. Recchi
(eds.). Lisbon, September 2010, Springer Verlag, in
press.