Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011xau5.confe..55w&link_type=abstract
"The Second Ferrara Workshop on "X-ray Astrophysics up to 511 keV", held in Ferrara (Italy), September 14 - 16, 2011, article #5
Astronomy and Astrophysics
Astrophysics
Scientific paper
Sub-luminous accreting black holes and neutron stars (with a low-mass donor) have atypical low X-ray luminosities of 10E34-10E36 erg/s, which corresponds roughly to 0.01-1% of the Eddington luminosity. The last decade a large amount of observational information on the behavior of those systems at such low accretion rates has been obtained, both for brighter transients which on their way to their quiescent state go through this accretion rate regime, as well as for those transients which never become brighter than 10E35-10E36 erg/s. In addition, a growing number of systems are known which are persistent at X-ray luminosities in this enigmatic luminosity range. I will present a shot overview of our knowledge of those systems and what we can learn from them with respect to the theories explaining accretion flows near compact objects and how they can help to constrain fundamental properties of compact objects.
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