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Title:
Kinematics of the Jet of the Crab Nebula
Authors:
Marcelin, M.; Veron-Cetty, M. P.; Woltjer, L.; Boulesteix, J.; D'Odorico, S.; Lecoarer, E.
Affiliation:
AA(Marseille, Observatoire, France), AB(Marseille, Observatoire, France), AC(Haute-Provence, Observatoire, Saint-Michel-l'Observatoire, France), AD(Haute-Provence, Observatoire, Saint-Michel-l'Observatoire, France; European Southern Observatory, Garching, Federal Republic of Germany), AE(European Southern Observatory, Garching, Federal Republic of Germany)
Publication:
Astronomy and Astrophysics (ISSN 0004-6361), vol. 228, no. 2, Feb. 1990, p. 471-476. (A&A Homepage)
Publication Date:
02/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
CONTINUOUS SPECTRA, CRAB NEBULA, RADIO JETS (ASTRONOMY), ASTRONOMICAL MODELS, FORBIDDEN TRANSITIONS, OXYGEN SPECTRA, RADIAL VELOCITY, SUPERNOVA REMNANTS
Bibliographic Code:
1990A&A...228..471M

Abstract

Spectroscopic observations of the Jet of the Crab Nebula confirm that it is an expanding cylinder with a mean expansion velocity of 260 km/s, with superposed random motions of + or - 60 km/s. The mean heliocentric recession velocity of the Jet is 184 km/s, constant along its whole length, except in the pedestal where it increases to 240 km/s. The newly determined expansion velocity of the Jet, together with the value of the proper motion of an emission knot therein, recently published by Fesen and Gull (1986) suggests that the Jet originated very early in the history of the Crab Nebula and is compatible with a homologous expansion of both. It is concluded that an instability in the filamentary shell is the most likely origin of the Jet.

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