Magellanic Cloud X-ray Sources III. Completion of a ROSAT Survey.pdf

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Magellanic Cloud X-ray Sources III. Completion of a ROSAT Survey.pdf

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Magellanic Cloud X-ray Sources III. Completion of a ROSAT Survey

a r X i v : a s t r o - p h / 9 8 1 2 2 1 7 v 1 1 0 D e c 1 9 9 8 Magellanic Cloud X-ray Sources: III. Completion of a ROSAT Survey P.C. Schmidtke1, A.P. Cowley1, J.D. Crane2, V.A. Taylor, and T.K. McGrath Department of Physics Astronomy, Arizona State University, Tempe, AZ, 85287-1504 e-mail: paul.schmidtke@; anne.cowley@ jdc2k@; taylor@; mcgrath@ J.B. Hutchings1 and David Crampton1 Dominion Astrophysical Observatory, National Research Council of Canada, Victoria, B.C., V8X 4M6, Canada e-mail: john.hutchings@hia.nrc.ca; david.crampton@hia.nrc.ca Received ; accepted 1Visiting Astronomers, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatories, which is operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation 2Now at Department of Astronomy, University of Virginia, Charlottesville, VA 22903- 0818 – 2 – ABSTRACT This paper concludes a series of three papers presenting ROSAT High- Resolution Imager (HRI) observations of unidentified Einstein and serendipitous ROSAT X-ray sources in the direction of the Magellanic Clouds. Accurate positions and fluxes have been measured for these sources. Optical photometry and spectroscopy were obtained to search for identifications in order to determine the physical nature of these sources. The present paper includes new data for 24 objects; identifications are given or confirmed for 30 sources. For six sources optical finding charts showing the X-ray positions are provided. The results from this program are summarized, showing the populations of luminous X-ray sources in the Magellanic Clouds are quite different from those in the Galaxy. Subject headings: X-ray sources – Magellanic Clouds – X-rays: stars – stars: neutron – (stars:) binaries: close – galaxies: stellar content – 3 – 1. Introduction The first comprehensive X-ray survey of the Magellanic Clouds was carried out by the Einstein Observatory which discovered a wide variet