Distribution and Identification of ACIS-S4 Streak Events
نویسنده
چکیده
Streak events are identified primarily on the basis of coincidence of > ν events occurring in a single chipy row of a single node within a single frame (Figure 1). The grade and fltgrade distributions of the streak events are similar to those of “good” events (Figure 2). The energy spectrum peaks at E ≈ 0.5 keV and shows weak line emission features, the strongest of which lies at 1.8 keV and is probably associated with silicon (Figure 3). Over the course of a long observation in which many frames are read out, only a small fraction of rows (q . 10) have streaks; they occur at about the same rate on each node. In chipx, the streaks are correlated with the readout nodes, but they appear uniformly distributed in chipy (Figure 4).
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تاریخ انتشار 2013