Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...260l..75g&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 260, Sept. 15, 1982, p. L75-L78.
Astronomy and Astrophysics
Astrophysics
55
Astronomical Photography, Crab Nebula, Plasma Jets, Radial Velocity, Supernova Remnants, Collimation, Forbidden Bands, Line Spectra, Oxygen Spectra, Stellar Spectra
Scientific paper
A very deep O III forbidden line image of the Crab Nebula's faint jet-like feature shows it in much greater detail than previously recorded and reveals it to be a wide, yet remarkably collimated structure. The jet, which is situated about 3 arcmin north of the remnant's center, extends outward from the nebula's outermost visible border and appears as a sharply defined rectangular emission region 45 x 75 arcsec in size. It has bright, parallel edges which suggest a tubular structure. However, the jet is not radially aligned toward either the Crab Nebula's center of expansion or pulsar. Spectroscopy of the northern tip indicates a radial velocity of +150 + or - 100 km/sec. The jet's optical appearance and possible origin are discussed.
Fesen Robert A.
Gull Ted R.
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