Molecular hydrogen in X-ray astronomy

Details Molecular hydrogen in X-ray astronomy Molecular hydrogen in X-ray astronomy

May 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974natur.249...24m&link_type=abstract

Nature, Volume 249, Issue 5452, pp. 24-25 (1974).

Physics

11

Scientific paper

THERE is a serious discrepancy between determinations of the column density of interstellar matter in the direction of the Crab Nebula. Virtually every soft X-ray observation1-5 with sufficient energy resolution to derive this column density yields a result substantially in excess of determinations based on 21-cm absorption6-8. The quality of the X-ray and radio data is now such that this disagreement must represent a genuine physical effect rather than an artefact of the data analysis.

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