AbstractWe present results of optical follow-up observations of candidate ultra-luminous X-ray sources (ULXs). Using Keck optical spectroscopy, 17 of the candidates from the Colbert and Ptak [Colbert, E.J.M., Ptak, A.F. A catalog of candidate intermediate-luminosity X-ray objects. ApJS 143, 25–45, 2002] catalog have been identified; this is one of the largest sets of optical identifications of such objects thus far. Fifteen are background active galactic nuclei (AGN); two are foreground stars in our Galaxy. These findings are consistent with background and foreground object expectations, as derived from logN–logS relations. Also, the results are briefly discussed in terms of the spiral-galaxy/ULX connection.


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    Titel :

    Keck observations of ROSAT ultra-luminous X-ray source candidates


    Beteiligte:

    Erschienen in:

    Advances in Space Research ; 38 , 12 ; 2813-2815


    Erscheinungsdatum :

    2006-01-16


    Format / Umfang :

    3 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





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