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A classification of the X-ray and radio states of Cyg X-3 and their long-term correlations | | A. Szostek
; A. A. Zdziarski
; M. L. McCollough
; | | Date: |
14 Mar 2008 | | Abstract: | We present a detailed classification of the X-ray states of Cyg X-3 based on
the spectral shape and a new classification of the radio states based on the
long-term correlated behaviour of the radio and X-ray light curves. We find a
sequence of correlations, starting with a positive correlation between the
radio and X-ray fluxes in the hard spectral state, changing to a negative one
at the transition to soft spectral states. The temporal evolution can be in
either direction on that sequence, unless the source goes into a very weak
radio state, from which it can return only following a major radio flare. The
return is via relatively strong radio states, which results in a hysteresis
loop on the flux-flux diagram. We then specify the detailed correspondence
between the radio states and the X-ray spectral states. We compare our results
to those of black-hole and neutron-star binaries. Except for the effect of
strong absorption and the energy of the high-energy break in the hard state,
the X-ray spectral states closely correspond to the canonical X-ray states of
black-hole binaries. Also, the radio/X-ray correlation closely corresponds to
that found in black-hole binaries, but it significantly differs from that in
neutron-star binaries. Overall, our results strongly support the presence of a
black hole in Cyg X-3. | | Source: | arXiv, 0803.2217 | | Services: | Forum | Review | PDF | Favorites | |
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