Crosstalk Analysis of Suprime-Cam FDCCDs Using Cosmic Rays in Dark Frames

We analyzed the crosstalks in the new full depleted CCDs in the Subaru Prime Focus Camera(Suprime-Cam). The effect is evaluated quantitatively using cosmic rays in dark frames. The crosstalk is well approximated by a linear correlation and the coefficient is ~ 10^-4. The coefficients are not significantly different among the 10 CCDs. We also find that the crosstalk appears not only in the corresponding pixels but also in the next pixel but one. No crosstalk is detected in Suprime-Cam among different CCDs. Based on the analysis, the correction procedure for the crosstalk is presented, and the application to the data is demonstrated.