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Soft X-ray observations of Centaurus X-3 from CopernicusWe have detected soft X-ray emission from Centaurus X-3 in the 0.6-1.9 keV band, using the focusing telescope aboard OAO Copernicus. The flux is compatible with an extrapolation of the harder X-ray spectrum, attenuated by (3-4) times 10 to the 22nd atoms per sq cm of interstellar and/or circumstellar matter. The data are consistent with the distance estimate of 5-10 kpc derived from the spectroscopic modulus of the optical component, and obviate the need to postulate the primary to be an anomalously subluminous hot star. There is currently no compelling evidence that such models must be invoked to explain any of the observed compact X-ray sources.
Document ID
19750042304
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Margon, B.
(California, University Berkeley, Calif., United States)
Mason, K. O.
Hawkins, F. J.
Sanford, P. W.
(London, University College, Dorking, Surrey, United Kingdom)
Date Acquired
August 8, 2013
Publication Date
March 1, 1975
Publication Information
Publication: Astrophysical Journal
Volume: 196
Subject Category
Space Radiation
Accession Number
75A26376
Funding Number(s)
CONTRACT_GRANT: NAS9-13799
Distribution Limits
Public
Copyright
Other

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