An expanded ultraluminous X-ray source catalogue
M. C. i Bernadich, A. D. Schwope, K. Kovlakas, A. Zezas, I., Traulsen

TL;DR
This paper compiles an extensive catalog of 779 ULX candidates from the latest XMM-Newton data, analyzing their properties and distributions across galaxy types to enhance understanding of ULX populations and their characteristics.
Contribution
The study presents a new, large ULX catalog based on 4XMM-DR9, including detailed spectral, abundance, and variability analysis, expanding previous research with a population-scale perspective.
Findings
ULX candidates are more abundant in late-type galaxies.
Candidates in late-type galaxies exhibit harder spectra and greater variability.
Approximately 30 candidates exceed luminosity of 10^{41} erg s^{-1}.
Abstract
Context. ULXs ( erg s) are excellent probes of accretion physics, star formation and IMBHs searches. As the sample size of X-ray data from modern observatories increases, producing extensive catalogues of ULXs and studying their collective properties is a possibility and a priority. Aims. We build a ULX catalogue based on one of the latest XMM-Newton releases, 4XMM-DR9, and the galaxy catalogue HECATE and study whether the properties of the expanded XMM-Newton ULX population are consistent with previous findings. Methods. We perform cross-matching between XMM-Newton sources and HECATE objects to identify host galaxies, and flag known interlopers in external catalogues and databases. Manual inspection of image data from PanSTARRS1 and the NASA/IPAC database is occasionally performed. We use distance and luminosity arguments to identify ULX candidates.…
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