Other
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ycat..73440134h&link_type=abstract
VizieR On-line Data Catalog: J/MNRAS/344/134. Originally published in: 2003MNRAS.344..134H
Other
1
X-Ray Sources
Scientific paper
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 LX>1039erg/s (L10) and 39 other sources were detected with LX>5x1038erg/s (L5). 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 50pc. 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-m flux as found in previous studies.
(4 data files).
Balucinska-Church Monika
Church M. J.
Elvis Martin
Fabbiano Giuseppina
Humphrey Philip J.
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