X-ray Counterparts of Be Gamma-ray Binary Candidates

The AGILE and Fermi missions have detected hundreds of unidentified GeV sourcesin the Galactic plane, but only a handful have been correlated with Xray oroptical counterparts. Several of these are high mass Xray binaries that alsoexhibit MeV, GeV, and/or TeV emission, leading to a new class of gammaraybinaries. More than half of all HMXB contain Be stars, and likewise most of theknown gammaray binaries are Be star systems. We have identified three new Bestars that may be associated with GeV point sources, and we propose XMMNewtonobservations to measure the position, flux, and spectral properties of the Xraycounterparts. Our modest time request will help identify several unknown GeVpoint sources, potentially doubling the number of known Be/gammaray binaries. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]