Abstract
We propose to detect quiescent X-ray emission and jets from three quiescent black holes, H 1705-250, GRS 1009-45, 4U 1543-47, with ACIS-S observations. Our proposed observations will allow us: 1) to test the prediction of the ADAF model to distinguish black hole and neutron star systems, and strengthen the evidence of the existence of event horizon; 2) to provide strong proof that accretion continues in quiescent black hole, and 3) to test if black hole systems require outflows.