Abstract
Observations with the SPI spectrometer on INTEGRAL have revealed an unexpected asymmetry in the 511 keV positron annihilation radiation from the galactic disk, leading to a suggestion that the creation of the positrons may be linked to Low Mass X-ray Binaries (Weidenspointner et al., 2008). The lifetime of positrons in the Galaxy and the distance that they travel before annihilation are uncertain, but on some assumptions an origin in LMXBs might lead to detectable structure in the 511 keV emission. More data are now available, allowing the conclusions of Weidenspointner et al. to be tested more deeply. We review the current situation and report on an analysis of the entire SPI dataset now available including searches for evidence of 511 keV emission spatially correlated with LMXBs.
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