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19 April 2024 |
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The slim-disk state of the ultraluminous X-ray source in M83 | | Roberto Soria
; K. D. Kuntz
; Knox S. Long
; William P. Blair
; Paul P. Plucinsky
; P. Frank Winkler
; | | Date: |
26 Nov 2014 | | Abstract: | The transient ULX in M83 that went into outburst in or shortly before 2010 is
still active. Our new XMM-Newton spectra show that it has a curved spectrum
typical of the upper end of the high/soft state or slim-disk state. It appears
to be spanning the gap between Galactic stellar-mass black holes and the
ultraluminous state, at X-ray luminosities $approx (1$-$3) imes 10^{39}$ erg
s$^{-1}$ (a factor of two lower than in the 2010-2011 Chandra observations).
From its broadened disk-like spectral shape at that luminosity, and from the
fitted inner-disk radius and temperature, we argue that the accreting object is
an ordinary stellar-mass black hole with $M sim$$10$-$20 M_{odot}$. We
suggest that in the 2010-2011 Chandra observations, the source was seen at a
higher accretion rate, resulting in a power-law-dominated spectrum with a soft
excess at large radii. | | Source: | arXiv, 1411.7212 | | Services: | Forum | Review | PDF | Favorites | |
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