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Table 1.
Values of parameters for Vela X.
| Pulsar and ejecta parameters | Symbol | Value |
|---|---|---|
| SN explosion energy (1051 erg) | ESN | 1.0 |
| Ejected mass (M⊙) | Mej | 8.05 |
| ISM density (cm−3) | ρism | 0.1 |
| Period (ms) | P | 89.3 |
| Period derivative (s s−1) | Ṗ | 1.25 × 10−13 |
| Initial spin-down power (erg s−1) | L0 | 3.64 × 1037 |
| Initial spin-down timescale (kyr) | τ0 | 21.0 |
| Braking index | n | 1.7 |
| Age (kyr) | Tage | 11.3 |
| Distance (pc) | d | 290 |
| Fitted parameters | ||
| Magnetic fraction | ηB | 0.0087 |
| Radio electron fraction | ηR | 0.97 |
| X-ray electron fraction | ηX | 0.018 |
| Spectral index of radio electrons | α1 | 1.91 |
| Maximum energy of radio electrons | γmax, R | 1.1 × 106 |
| Maximum energy of X-ray electrons | γmax, X | 2.0 × 109 |
| Initial diffusion coefficient (cm2 s−1) | κ0 | 9.0 × 1018 |
| SNR temperature (K) | Tsn | 42 |
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