Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993natur.362..133c&link_type=abstract
Nature (ISSN 0028-0836), vol. 362, no. 6416, p. 133-135.
Astronomy and Astrophysics
Astronomy
143
Bow Waves, Nebulae, Neutron Stars, Shock Waves, Stellar Rotation, Stellar Winds, Black Holes (Astronomy), Interstellar Gas, Milky Way Galaxy, Molecular Collisions, Stellar Luminosity
Scientific paper
The discovery is reported of a prominent nebula produced by the motion of a high-velocity pulsar, PSR 2224 + 65, through partially neutral gas. The pulsar's transverse speed of over about 800 km/s makes it arguably the fastest known star in the Galaxy and guarantees that it will ultimately escape the Galactic potential well. A deep H-alpha image reveals a bright head and a giant limb-brightened 'body' whose variable width suggests that the ambient interstellar gas has density variations on length scales less than 0.1 pc. Thermalization of shock energy occurs at a rate of about 0.01 times the pulsar's spindown loss rate. These observations provide some insights into the likelihood of finding shocks around other pulsars and the use of nebulae to find high-velocity neutron stars either not acting as pulsars or with their radiation beamed away from the earth.
Cordes James M.
Lundgren Scott C.
Romani Roger W.
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