Table 2.
Line shape parameters and derived quantities for the 44Sc and 44Ti decay in Cassiopeia A.
| 78 keV | 1157 keV | Combined | Three lines combined | |
|---|---|---|---|---|
| Flux [10−5 ph cm−2 s−1] | 3.3 ± 0.9 | 9.5 ± 3.0 | 4.2 ± 1.0 | 4.6 ± 0.8 |
| Mass [10−4 M⊙] | 2.1 ± 0.6 | 5.9 ± 1.9 | 2.6 ± 0.6 | 2.9 ± 0.5 |
| Centroid [keV] | 77.7 ± 0.5 | 1151 ± 7.9 | 77.9 ± 0.2; 1150.5 ± 3.2 | 67.5 ; 77.9; 1150.5 (fixed) |
| Shift [km s−1] | 2400 ± 1500 | 1600 ± 2000 | 1800 ± 800 | 1800 (fixed) |
| Line FWHM [keV] | 2.3 ± 0.8 | 40.0 ± 6.7 | 2.4 ± 0.9; 31.2 ± 6.6 | 2.3; 2.4; 31.2 (fixed) |
| Expansion velocity [km s−1] | 5500 ± 2700 | 8900 ± 1500 | 6400 ± 1900 | 6400 (fixed) |
| Significance [σ] | 3.6 | 3.3 | 4.9 | 5.4 |
Notes. Values are given for individual line fits and the combined 78 and 1157 keV line fit, which is determined by fitting both lines with the same Doppler broadening and Doppler shift relative to their centroid energy. The last column contains the values for a combined fit of all three lines, but with Doppler parameters fixed to the values determined for the 78 + 1157 keV line fit.
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