IXPE prospects for the Black Hole Binary 1E1740.7-2942

1E1740.7-2942 is a persistent black hole candidate in the Galactic Center who remarkably spends most of its time in the low/hard state. Due to high absorption, no optical counterpart of the companion star has been identified yet, leaving the black hole mass and its nature as low or high mass binary unknown. The system inclination is also unconstrained, however the presence of bipolar symmetric jets support the hypothesis of high inclination. Due to these characteristics, 1E1740.7-2942 is a promising target for IXPE (Imaging X-ray Polarimeter Explorer), for the study of the geometry of the corona in an X-ray binary trough X-ray polarimetry. We selected archival data for near-simultaneous XMM-Newton, NuSTAR and INTEGRAL observations in order to obtain a broad band spectrum. The data were fitted with a detailed Comptonization model. The obtained coronal parameters were employed to simulate an IXPE observation and retrieve the expected polarization properties.