Keck observations of ROSAT ultra-luminous X-ray source candidates |
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Authors: | Diane Sonya Wong Ryan Chornock Alexei V Filippenko |
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Institution: | aAstronomy Department, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411, USA |
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Abstract: | We 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 log N–log S relations. Also, the results are briefly discussed in terms of the spiral-galaxy/ULX connection. |
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Keywords: | Black hole physics Catalogs Galaxies distances and redshifts Galaxies individual (NGC 720 NGC 1316 NGC 1365 NGC 1399 NGC 2775 NGC 3226 IC 2597 NGC 3923 NGC 4151 NGC 4373 NGC 5128) Quasars general X-rays galaxies |
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