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Title:
Optical identification of dust within the Crab Nebula's filaments
Authors:
Fesen, Robert; Blair, William P.
Affiliation:
AA(Colorado, University, Boulder; Dartmouth College, Hanover, NH), AB(Johns Hopkins University, Baltimore, MD)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 351, March 10, 1990, p. L45-L48. Research supported by the Johns Hopkins University. (ApJL Homepage)
Publication Date:
03/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
COSMIC DUST, CRAB NEBULA, INTERSTELLAR MATTER, SUPERNOVA REMNANTS, SUPERNOVAE, CONTINUOUS SPECTRA, EMISSION SPECTRA, FORBIDDEN TRANSITIONS, SYNCHROTRON RADIATION
DOI:
10.1086/185676
Bibliographic Code:
1990ApJ...351L..45F

Abstract

Optical continuum images of the Crab Nebula are presented which reveal numerous, small dark spots across the face of the Crab's amorphous synchrotron nebula. These spots range in size from being unresolved at 0.8-arcsec resolution to about 5 arcsec, exhibit Delta(m)4470 = 0.08-0.44, and are most visible in the shorter-wavelength continuum images. Comparisons with images taken using interference filters centered on various emission lines indicate that these dark features are coincident with forbidden O I, C I, and S II bright cores of selected filaments. This positional coincidence plus a wavelength dependence similar to that exhibited by conventional interstellar dust establishes the presence of dust within at least some of the Crab Nebula's filaments.

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