Measurement of the Positions of X-Ray Sources

Details Measurement of the Positions of X-Ray Sources Measurement of the Positions of X-Ray Sources

Oct 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974rspsa.340..439w&link_type=abstract

Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 340, Issue 1623, pp. 439-446

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Scientific paper

A method of measuring the positions of X-ray sources with Copernicus is described. The limitation of the accuracy achievable for bright sources is set by the uncertainty in the experiment pointing direction which is about ± 0.5', while for faint sources an additional contribution to the error of a similar magnitude arises from statistical fluctuations in the counting rates. The positions of a number of sources have been successfully measured. In addition, bright stars proposed as optical counterparts for a further four sources have been examined. Three of these associations are disproved, the results for the fourth being inconclusive. The proposed association of sources in the 2U catalogue with bright stars is found to be unlikely, the number of coincidences having been reduced by these and other observations to the level expected from random fluctuations.

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