Table 2
Comparison between the different methods of estimating Γ0 found in literature.
| Model | k |
|
|
| s = 0 | s = 2 | ||
|
|
|||
| SP99 |
|
0.852 | 0.772 |
| M07 |
|
1.702 | 1.543 |
| G10 |
|
0.507 | 0.649 |
| G12 |
|
0.687 | 0.669 |
| N13 |
|
1 | 1 |
| N14 |
|
0.971 | 0.946 |
Notes. k is a dimensionless factor that varies according to the different models and the power law index of the external medium density profile s (see Eq. (15)). The values of Γ0 are numerically compared with the one obtained by Nava et al. (2013), in the case of homogeneous medium (s = 0) and wind medium (s = 2). We chose to compare the result of G10 using the published formula with the parameter a = 4−s as prescribed by the Blandford & McKee (1976) dynamics. SP99: Sari & Piran (1999); M07: Molinari et al. (2007); G10: Ghisellini et al. (2010); G12: Ghirlanda et al. (2012); N13: Nava et al. (2013); N14: Nappo et al. (2014).
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