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 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cxo..prop.1366j&link_type=abstract

Chandra Proposal ID #05400238

Computer Science

Chandra Proposal Id #05400238

Scientific paper

We propose to obtain 3 observations of a BHC 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 BHC SXTs extends to X-ray flux levels a factor of 1000 lower. If this relation holds this may explain the fact that the BHC 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 BHC SXT at scarcely studied luminosity intervals. These spectra can be compared with sources discovered serendipitously (eg in surveys); perhaps these are stably accreting BHCs at low M dot.

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