Interstellar Absorption of the Low Energy X-rays from the Crab Nebula
Open Access
- 1 December 1973
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 165 (4) , 355-361
- https://doi.org/10.1093/mnras/165.4.355
Abstract
Observations of the soft X-ray emission from the Crab Nebula, made with the MSSL X-ray telescopes on board the satellite Copernicus, require a review of the currently accepted interstellar abundances of light elements. The soft X-ray data imply a gas column density of (3.1±0.5) × 1021 atoms cm−2 using Brown & Gould X-ray absorption cross-sections. Results obtained from 21 cm radio measurements indicate a lower value of the column density. Better agreement between the X-ray and radio values can be obtained by increasing the abundances of helium and neon over those assumed by Brown & Gould.Keywords
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