Table 2
Number of events filled in a histogram for the three-month simulation of each source distribution.
| Target | Source (S) | Background (B) | S/B (%) |
|---|---|---|---|
| 44Ti | 1.77 × 103 | 4.92 × 105 | 0.36 |
| 26Al | 1.00 × 105 | 2.26 × 105 | 44 |
| e+/e− | 2.29 × 105 | 2.09 × 106 | 11 |
Notes. The bin size of each axis in the event histogram is the same as shown in Table 3. Here, the total event counts in the CDS are compared. However, for a known point source, it is also important to consider the number of background events that overlap with the source event distribution in CDS. This is because point source events are distributed in a cone shape in CDS, and primarily, only the nearby background events affect the analysis. When counting only the background events close to the source distribution for Cas A, the S/B ratio is about 3–5% in our 44Ti simulation.
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