Following a black hole candidate soft X-ray transient returning to quiescence

Details Following a black hole candidate soft X-ray transient returning to quiescence Following a black hole candidate soft X-ray transient returning to quiescence

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cxo..prop.1667j&link_type=abstract

Chandra Proposal ID #06400115

Physics

Chandra Proposal Id #06400115

Scientific paper

We propose to obtain 5 observations of a BH SXT as it returns to quiescence, for each of the observations we also request a nearly simultaneous VLA radio observation. Using these observations we can test whether the empirical relation between the radio and X-ray flux found over 4 decades in X-ray flux in low/hard state BH SXTs extends to X-ray flux levels a factor of 600 lower. If this relation holds this may explain the fact that the BH SXTs in quiescence are fainter in X-rays than NS SXTs without the need of a BH event-horizon. Furthermore, we will obtain high quality spectra of a BH SXT at scarcely studied luminosity intervals, allowing us to determine whether the evolution of the powerlaw spectral index is smooth or abrupt.

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