Table 2
Rate of production per SN of NS-BH and BH-BH systems formed after a ULX phase which are compact enough to merge in less than a Hubble time.
| log Z |
|
|
|
|
||
| −2.5 | 0.33−0.91 | 0 |
| −3.0 | 1.0−2.6 | 0 |
| −3.5 | 1.2−2.1 | 0.076 |
| −4.0 | 1.2−1.9 | 0.045 |
| −4.5 | 0.87−1.6 | 0.16 |
| −5.0 | 0.83−1.6 | 3.4 |
| −5.5 | 0.41−0.80 | 4.4 |
| −6.0 | 0−0.014 | 0.63 |
|
|
||
| local | 0.069–0.18 | 0.00029 |
Notes. The NS-BH rate depends on the threshold mass at which a NS is formed, and the lower and upper bounds given are calculated assuming that for final core masses above 8 M⊙ and 12 M⊙, respectively, BHs are formed instead of NSs.
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