Matches in SemOpenAlex for { <https://semopenalex.org/work/W3122677850> ?p ?o ?g. }
- W3122677850 endingPage "1210" @default.
- W3122677850 startingPage "1193" @default.
- W3122677850 abstract "We report the results of a programme of dual-epoch Chandra ACIS-S observations of five ultraluminous X-ray sources (ULXs) in nearby spiral galaxies. All five ULXs are detected as unresolved, point-like X-ray sources by Chandra, though two have faded below the 10^39 erg/s luminosity threshold used to first designate these sources as ULXs. Using this same criterion, we detect three further ULXs within the imaged regions of the galaxies. The ULXs appear to be related to the star forming regions of the galaxies, indicating that even in ``normal'' spiral galaxies the ULX population is predominantly associated with young stellar populations. A detailed study of the Chandra ACIS-S spectra of six of the ULXs shows that five are better described by a powerlaw continuum than a multi-colour disc blackbody model, though there is evidence for additional very soft components to two of the powerlaw continua. The measured photon indices in four out of five cases are consistent with the low/hard state in black hole binaries, contrary to the suggestion that powerlaw-dominated spectra of ULXs originate in the very high state. A simple interpretation of this is that we are observing accretion onto intermediate-mass black holes, though we might also be observing a spectral state unique to very high mass accretion rates in stellar-mass black hole systems. Short-term flux variability is only detected in one of two epochs for two of the ULXs, with the lack of this characteristic arguing that the X-ray emission of this sample of ULXs is not dominated by relativistically-beamed jets. The observational characteristics of this small sample suggest that ULXs are a distinctly heterogeneous source class." @default.
- W3122677850 created "2021-02-01" @default.
- W3122677850 creator A5023229545 @default.
- W3122677850 creator A5026641090 @default.
- W3122677850 creator A5030608184 @default.
- W3122677850 creator A5037688108 @default.
- W3122677850 date "2004-04-01" @default.
- W3122677850 modified "2023-09-26" @default.
- W3122677850 title "Chandraobservations of five ultraluminous X-ray sources in nearby galaxies" @default.
- W3122677850 cites W1537855652 @default.
- W3122677850 cites W1677610789 @default.
- W3122677850 cites W1967166434 @default.
- W3122677850 cites W1969336608 @default.
- W3122677850 cites W1974047653 @default.
- W3122677850 cites W1979579042 @default.
- W3122677850 cites W1980707694 @default.
- W3122677850 cites W1987678168 @default.
- W3122677850 cites W1989270797 @default.
- W3122677850 cites W1989812705 @default.
- W3122677850 cites W1990955282 @default.
- W3122677850 cites W1991860486 @default.
- W3122677850 cites W1997313837 @default.
- W3122677850 cites W1997410891 @default.
- W3122677850 cites W2002015260 @default.
- W3122677850 cites W2006603329 @default.
- W3122677850 cites W2009514004 @default.
- W3122677850 cites W2011701263 @default.
- W3122677850 cites W2015222572 @default.
- W3122677850 cites W2018681307 @default.
- W3122677850 cites W2022598858 @default.
- W3122677850 cites W2023697843 @default.
- W3122677850 cites W2026258716 @default.
- W3122677850 cites W2027776499 @default.
- W3122677850 cites W2031535911 @default.
- W3122677850 cites W2031822948 @default.
- W3122677850 cites W2032832712 @default.
- W3122677850 cites W2034191025 @default.
- W3122677850 cites W2048105248 @default.
- W3122677850 cites W2050252364 @default.
- W3122677850 cites W2058561119 @default.
- W3122677850 cites W2066931370 @default.
- W3122677850 cites W2075239744 @default.
- W3122677850 cites W2078646064 @default.
- W3122677850 cites W2080255240 @default.
- W3122677850 cites W2081891224 @default.
- W3122677850 cites W2083835845 @default.
- W3122677850 cites W2088819227 @default.
- W3122677850 cites W2093434052 @default.
- W3122677850 cites W2096799509 @default.
- W3122677850 cites W2111569458 @default.
- W3122677850 cites W2116202699 @default.
- W3122677850 cites W2116647446 @default.
- W3122677850 cites W2117138716 @default.
- W3122677850 cites W2124131920 @default.
- W3122677850 cites W2124149939 @default.
- W3122677850 cites W2137783236 @default.
- W3122677850 cites W2138391934 @default.
- W3122677850 cites W2138467791 @default.
- W3122677850 cites W2144103344 @default.
- W3122677850 cites W2144462717 @default.
- W3122677850 cites W2144890838 @default.
- W3122677850 cites W2147105101 @default.
- W3122677850 cites W2149050370 @default.
- W3122677850 cites W2164570275 @default.
- W3122677850 cites W3097976529 @default.
- W3122677850 cites W3098386549 @default.
- W3122677850 cites W3098815633 @default.
- W3122677850 cites W3099647771 @default.
- W3122677850 cites W3100059477 @default.
- W3122677850 cites W3100945405 @default.
- W3122677850 cites W3101297932 @default.
- W3122677850 cites W3102198414 @default.
- W3122677850 cites W3102708780 @default.
- W3122677850 cites W3102797186 @default.
- W3122677850 cites W3102835106 @default.
- W3122677850 cites W3103597709 @default.
- W3122677850 cites W3104379663 @default.
- W3122677850 cites W3104649110 @default.
- W3122677850 cites W3105394316 @default.
- W3122677850 cites W3105687258 @default.
- W3122677850 cites W3106024153 @default.
- W3122677850 cites W3106294197 @default.
- W3122677850 cites W3122687038 @default.
- W3122677850 cites W3123307746 @default.
- W3122677850 cites W3125275757 @default.
- W3122677850 cites W3125623006 @default.
- W3122677850 cites W4302925118 @default.
- W3122677850 doi "https://doi.org/10.1111/j.1365-2966.2004.07626.x" @default.
- W3122677850 hasPublicationYear "2004" @default.
- W3122677850 type Work @default.
- W3122677850 sameAs 3122677850 @default.
- W3122677850 citedByCount "56" @default.
- W3122677850 countsByYear W31226778502013 @default.
- W3122677850 countsByYear W31226778502014 @default.
- W3122677850 countsByYear W31226778502015 @default.
- W3122677850 countsByYear W31226778502016 @default.
- W3122677850 countsByYear W31226778502017 @default.
- W3122677850 countsByYear W31226778502019 @default.