Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-12-03
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
6 pages, 8 figures, accepted for publication in Astronomische Nachrichten, to appear in the proceedings of the conference "Ult
Scientific paper
A large number of Ultra-Luminous X-ray Sources in external galaxies is now known, but the discussion about their nature is still unsettled: intermediate-mass black holes or stellar-mass black holes accreting above the Eddington limit? A promising path that can provide an answer is through comparison with "normal" stellar-mass black holes. These display separate states, identified from both their energy spectra and their fast variability. Although the nature of these states and their transitions is not clear, such a comparison can be extremely useful. In this paper, I briefly outline our current phenomenological knowledge of these states and present a (partial) overview of the different approaches followed to make these comparisons.
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