The HEAO-1 satellite has produced the most complete, all-sky, X-ray survey. The sources extend to levels as faint as 1/2 Uhuru Flux Unit (UFU), with uncertain completeness below 1.25 UFU. Approximately 350 out of 840 sources have certain or highly probable optical counterparts. The identifications are necessary for estimating distances to the objects, so that properties are measured intrinsic to the source, and for establishing the classifications of the astronomical systems. There is also the opportunity to obtain TENMA and EXOSAT observations of X-ray spectra and time variability, since in general almost nothing is known of the X-ray characteristics of these weaker sources. Methods are here reviewed and the new active galactic nuclei X-ray counterparts are discussed.


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    Titel :

    Recent optical identifications of HEAO-1 X-ray sources


    Beteiligte:
    Schwartz, D. A. (Autor:in) / Roberts, W. (Autor:in) / Bradt, H. (Autor:in) / Remillard, R. (Autor:in) / Buckley, D. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1985-01-01



    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


    Heao Science Symposium

    C. Dailey / W. Johnson | NTIS | 1979


    HEAO-1 mission evaluation

    Giordano, F. V. / Brenes, U. R. / Breshears, B. J. | NTRS | 1979


    Aspect system for HEAO-B

    Koch, D. / Hall, R. / Tsao, H. et al. | Tema Archiv | 1978



    Imaging proportional x-ray counter for HEAO

    Humphrey, A. / Cabral, R. / Brissette, R. et al. | Tema Archiv | 1978