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Title:
Extraordinary line-emitting knots in the Crab Nebula
Authors:
MacAlpine, Gordon M.; Lawrence, Stephen S.; Brown, Beth A.; Uomoto, Alan; Woodgate, Bruce E.; Brown, Larry W.; Oliversen, Ronald J.; Lowenthal, James D.; Liu, Charles
Affiliation:
AA(Univ. of Michigan, Ann Arbor, MI, US), AB(Univ. of Michigan, Ann Arbor, MI, US), AC(Univ. of Michigan, Ann Arbor, MI, US), AD(Univ. of Michigan, Ann Arbor, MI, US), AE(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AF(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AG(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AH(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AI(Univ. of Arizona, Tucson, AZ)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 432, no. 2, p. L131-L134 (ApJL Homepage)
Publication Date:
09/1994
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
ABUNDANCE, CRAB NEBULA, LINE SPECTRA, PULSARS, SUPERNOVA REMNANTS, VISIBLE SPECTRUM, ARGON, FABRY-PEROT INTERFEROMETERS, OXYGEN, THREE DIMENSIONAL MOTION, VELOCITY
DOI:
10.1086/187529
Bibliographic Code:
1994ApJ...432L.131M

Abstract

Extraordinary, semistellar, line-emitting knots are apparent in images of the Crab Nebula which were obtained with the Goddard Fabry-Perot imager at the Michigan-Dartmouth-MIT Observatory. The knots are most prominent for (O III) lambda 5007 emission through a 5.3 A (Full Width at Half Maximum (FWHM)) bandpass centered at 5015.3 A, with representative fluxes of roughly 10-14 ergs/sq cm. They are aligned in arcs, seven to the north and four to the south, from the pulsar. The northern group appears to be in a bounded corridor through the filamentary structure. Measurements over a 2 year baseline yield proper motions of order 0.1 sec/yr, corresponding to transverse velocities of order 900 km/s for a distance of 1830 pc. The knots are characterized by remarkably strong (Ar III) emission, possibly indicating high argon abundances, high gas temperatures, or anomalous physical processes.

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