Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.263...69f&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 263, no. 1, p. 69-74.
Astronomy and Astrophysics
Astronomy
11
Crab Nebula, Plasma Jets, Stellar Mass Ejection, Supernova Remnants, Astronomical Models, Astronomical Spectroscopy, Stellar Evolution, Stellar Motions
Scientific paper
A high-resolution forbidden O III 5007 A image of the northern 'jet' feature of the Crab nebula shows it to be a delicate structure containing numerous knots and filaments. Comparison of this image with one taken five years earlier yields proper motions of 0.19-0.34 arcsec/yr for 14 features located in the northern half of the jet. Adopting 0.26 arcsec/yr as a representative value, the motion of the jet corresponds to a transverse velocity of 2500 x (d/2 kpc) km/s. This is consistent with an age and postsupernova acceleration comparable to the rest of the nebula, suggesting an origin coeval with the AD 1054 supernova event. The measurements also suggest a radial-like expansion away from the center of the remnant, despite the highly nonradial appearance of the jet. Radial motions imply that the nonradial structure of the jet is not kinematically driven by peculiar filament motions along the northern periphery of the remnant. Slit spectroscopy along the major axis shows no radial velocity decrease near the northern end of the jet to indicate any filament closure. Possible origins of the jet are briefly discussed.
Fesen Robert A.
Staker Bryan
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