Table 2
Expectations for COSI-SMEX.
| Model | Line energy | Full-sky rate | Total counts in 2 yr | Model vs. MW | Model vs. [MW + BG] | Time to reach 5σ |
|---|---|---|---|---|---|---|
| (keV) | (cnts yr−1) |  |
 |
(yr) | ||
| LB 1a | 1809 | 5.8 × 103 | 1.2 × 104 | 3.2 | 2.5 | 3.9 |
| LB 1b | 1809 | 6.0 × 103 | 1.2 × 104 | 3.3 | 2.5 | 3.8 |
| LB 2a | 1809 | 3.4 × 104 | 6.8 × 104 | 18.6 | 14.7 | 0.1 |
| LB 2b | 1809 | 1.2 × 104 | 2.4 × 104 | 6.5 | 5.1 | 1.0 |
| MW | 1809 | 3.3 × 106 | 6.6 × 106 | – | ≳1000 | 2 × 10−5 |
| LB 1a | 1332 | 8.7 × 103 | 1.7 × 104 | 9.6 | 4.3 | 1.4 |
| LB 1b | 1332 | 9.0 × 103 | 1.8 × 104 | 9.9 | 4.4 | 1.3 |
| LB 2a | 1332 | 8.0 × 104 | 1.6 × 105 | 84.1 | 38.6 | 2 × 10−2 |
| LB 2b | 1332 | 6.1 × 104 | 1.2 × 105 | 65.0 | 29.6 | 3 × 10−2 |
| MW | 1332 | 8.2 × 105 | 1.6 × 106 | – | ≳300 | 2 × 10−4 |
| LB 1a | 511 | 4.1 × 104 | 8.1 × 104 | 16.9 | 8.6 | 0.3 |
| LB 1b | 511 | 3.9 × 104 | 7.8 × 104 | 16.2 | 8.3 | 0.4 |
| LB 2a | 511 | 3.6 × 103 | 7.3 × 103 | 1.5 | 0.8 | 42 |
| LB 2b | 511 | 3.2 × 103 | 6.3 × 103 | 1.3 | 0.7 | 55 |
| MW | 511 | 5.8 × 106 | 1.2 × 107 | – | ≳1000 | 2 × 10−5 |
Notes. From left to right the columns show the model, with cases 1a to 2b (see Table 1), the line energy, the rate expected for each model per year, the total number of photons in the nominal mission time of 2 yr, the significance of the model vs. the Milky Way (MW) background only (assuming no instrumental background) in units of σ scaled per year, the significance of the model vs. the Milky Way and instrumental background together in units of σ scaled per year, and the time to reach a significance of 5σ for each model. In each case, the Milky Way foreground is assumed to have contributions from both the γ-ray lines and the Galactic diffuse continuum beneath the lines.
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