Black hole event horizon and advection-dominated accretion

The defining property of a black hole is its event horizon through whichmatter and energy can rain in, but from which nothing can escape. Wepropose to establish the reality of event horizons by comparing inquiescent Xray novae the behaviour of accreting black holes to thebehaviour of accreting neutron stars. A byproduct of this study will bea handle on the processes that transport angular momentum in accretiondiscs. Guided by earlier work and a new paradigm for accretion theADAF model we propose to observe three blackhole systems, Nova Mus 1991, GRS 100945 and XTE J1550564, with EPIC and the OM. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]