期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 344, 期 1, 页码 134-148出版社
BLACKWELL PUBLISHING LTD
DOI: 10.1046/j.1365-8711.2003.06802.x
关键词
accretion, accretion discs; black hole physics; binaries : close; X-rays : galaxies; X-rays : stars
We present results of a Chandra survey of the ultraluminous X-ray sources (ULX) in 13 normal galaxies, in which we combine source detection with X-ray flux measurement. 22 ULX were detected, i.e. with L-x > 1 x 10(39) erg s(-1) (L-10) and 39 other sources were detected with L-x > 5 x 10(38) erg s(-1) (L-5). We also use radial intensity profiles to remove extended sources from the sample. The majority of sources are not extended, which for a typical distance constrains the emission region size to less than 50 pc. X-ray colour-colour diagrams and spectral fitting results were examined for indicators of the ULX nature. In the case of the brighter sources, spectral fitting generally requires two-component models. In only a few cases do colour-colour diagrams or spectral fitting provide evidence of a black hole nature. We find no evidence of a correlation with stellar mass, however, there is a strong correlation with star formation as indicated by the 60-mum flux as found in previous studies.
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