Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...301..759s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 301, Feb. 15, 1986, p. 759-771.
Astronomy and Astrophysics
Astronomy
52
Astronomical Spectroscopy, Crab Nebula, Interstellar Gas, Oxygen, X Ray Astronomy, Abundance, Focal Plane Devices, Grains, High Resolution, Spaceborne Astronomy
Scientific paper
The authors have measured a high-resolution spectrum of the Crab Nebula in the 0.5 - 3 keV band using the Einstein Observatory. The oxygen K-edge is prominent in the measured spectrum. The detailed spectrum in the vicinity of this edge gives marginal evidence for a resonant 1s - 2p absorption line and hints of a K-edge from singly ionized oxygen. Model fitting to the overall spectrum yields a hydrogen column density of 3.45±0.42×1021cm-2 and an oxygen column density of 2.78±0.55×1018cm-2, corresponding to an oxygen abundance of 1.1±0.3 times solar. The absence of any evident oxygen depletion effects suggests that most interstellar grains are reasonably transparent to soft X-rays, implying sizes <0.4 μm.
Canizares Calude R.
Schattenburg Mark L.
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