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We report the discovery of 11 newly found quasars behind the stellar disks ofthe spiral galaxies M31 and M33 in the fields covered by the Local Group GalaxySurvey. Their redshifts range from 0.37 to 2.15. Most are X-ray, UV, and IRsources. We also report the discovery of 5 normal background galaxies. Most ofthese objects were observed owing to their anomalous colors, as part of aprogram (reported elsewhere) to confirm spectroscopically candidate redsupergiant plus B star binaries; others were discovered as part of ouridentification of early-type massive stars based upon their optical colors.There are 15 previously known quasars in the same fields, for a grand total of26, 15 behind M31 and 11 behind M33. Of these, only eight were discovered aspart of surveys for quasars; the rest were found accidentally. The quasars arewell distributed in the M31 and M33 fields, except for the inner regions, andhave the potential for being good probes of the interstellar medium in thesestellar disks, as well as serving as zero-point calibrators for Gaiaparallaxes.

The Discovery of QSOs Behind M31 and M33