Fig. 7
Search for optical and infrared counterparts to the sources N and S. Left: STCI-DSS image. We overplot the position of sources N and S (radius equal to the position accuracy, 2″) as determined from the EPIC-MOS1 observation, and the most likely optical counterpart from the USNO-A2.0 and USNO-B1.0 catalogs (green circles, with radius 0.6″). Right: 2MASS image. The position of sources N and S is indicated as above. We marked the location of the potential infrared counterparts retrieved from the 2MASS catalog (green circles, with radius 0.6″).
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