Digging a little deeper: characterizing three new extreme ULX candidates
T P Roberts,
D J Walton,
A D A Mackenzie
et al.
Abstract:A prime motivation for compiling catalogues of any celestial X-ray source is to increase our numbers of rare sub-classes. In this work we take a recent multi-mission catalogue of ultraluminous X-ray sources (ULXs) and look for hitherto poorly-studied ULX candidates that are luminous ($L_{\rm X} \ge 10^{40} \rm ~erg~s^{-1}$), bright ($f_{\rm X} \ge 5 \times 10^{-13} \rm ~erg~cm^{-2}~s^{-1}$) and have archival XMM-Newton data. We speculate that this luminosity regime may be ideal for identifying new pulsating UL… Show more
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