Determining the Nature of Unidentified IGR Sources in the Galactic Plane

The INTEGRAL satellite has been discovering extreme sources that were missed byprevious surveys. While this is providing a much more complete view of hardXray source populations, followup efforts are essential for determining thenature of the sources. This proposal, which focuses on Galactic sources, such asthe population of High Mass Xray Binaries (HMXBs), includes three sources forwhich short Chandra observations made during the past year have allowed for theidentification of optical counterparts. We propose to perform a complete anddefinitive identification of IGR J140916108, IGR J183810924 and IGRJ171643803 by combining XMM, VLT (optical spectroscopy), and NuSTARobservations. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]