0120112

The X-ray flux observed from X-ray transients changes by several orders of magnitude between quiescence and outburst providing an opportunity to learn about black hole candidates (BHCs) accretion onto compact objects and the processes responsible for high energy emission. The high energy emission provides a probe of the regions of space close to the compact object allowing us to study strong gravity and jet formation processes. 4U 1630-47 is the only BHC X-ray transient that has outbursts which recur on a relatively regular and short time scale. In addition to having a high level of activity the source produces strong hard X-ray emission and optically thin highly polarized synchrotron radio emission indicating the presence of jets. We propose to observe 4U 1630-47 with INTEGRAL along with contemporaneous radio observations in order to: 1. measure the properties of high energy emission lines (if they are present) including the narrow electron-positron annihilation line at 511~keV and the 300-500~keV lines of uncertain origin that have been observed in other systems 2. determine the relationship between the radio and high energy emission and 3. measure the energy spectra in the hard and soft states to place constraints on accretion geometries and emission mechanisms. The high spectral resolution good sensitivity and broadband capabilities of INTEGRAL are critical for achieving the goals of this proposal. [truncated! Please see actual data for full text]