Spectral behaviour of an INTEGRAL sample of black hole candidates: Initial results

In this paper, we present the spectral characteristics of a sample of Black Hole Candidates observed with the IBIS, SPI and JEM-X instruments on board the INTEGRAL Gamma-ray Observatory. This work is part of the long term, systematic, spectral study programme of intermediate intensity BHC (<500 mCrab) within the INTEGRAL Core Programme observations. The basic data set is from Galactic Plane Scan (GPS) and Galactic Centre Deep Exposure (GCDE), collected from the beginning of the Integral scientific observation programme. We will address in particular the behaviour of IGR J17464-3213, 1E 1740.7-294 and XTE J1720-318.