Table 2
Physical magnitudes.
| Parameters | Symbol | J1208-6238 | J1341-6220 | J1838-0537 | J1844-0346 |
|---|---|---|---|---|---|
| Measured, assumed, or derived parameters: | |||||
| Period (s) | P | 0.441 | 0.193 | 0.146 | 0.113 |
| Period derivative (s s−1) | Ṗ | 3.27 × 10−12 | 2.53 × 10−13 | 4.72 × 10−13 | 1.55 × 10−13 |
| Characteristic age (kyr) | τc | 2.14 | 12.1 | 4.89 | 11.6 |
| Spin-down luminosity now (erg s−1) | Ė | 1.51 × 1036 | 1.38 × 1036 | 6.02 × 1036 | 4.25 × 1036 |
| Distance (kpc) | d | 3, 6, 10 | 12.6 | 2.0 | 2.4, 4.3, 10 |
| Initial spin-down age | τ0 | (2τc)/(n − 1) − ta𝑔e | |||
| Initial spin-down luminosity (erg s−1) | L0 | Ė/(1 + ta𝑔e/τ0)−(n+1)/(n−1) | |||
| Parameter ranges: | |||||
| Age (τc) | ta𝑔e | [0.7, 1.2] | [0.7, 1.3] | – | – |
| ISM density (cm− ) | nism | [0.1, 1] | – | – | – |
| Break energy | γb | [105, 107] | – | – | – |
| Low energy index | α1 | [1.0, 1.6] | – | – | – |
| High energy index | α2 | [2.2, 2.8] | – | – | – |
| Ejected mass (M⊙) | Mej | [5,15] | – | – | – |
| Magnetic energy fraction | η | [0.02, 0.04] | – | – | – |
| FIR energy density (eV cm−3) | Ufir | [0.55, 1.65] | [0.29, 0.87] | [0.82, 2.46] | [0.82, 2.46] |
| NIR energy density (eV cm−3) | Unir | [0.82, 2.46] | [0.51, 1.53] | [1.06, 3.18] | [1.06, 3.18] |
| Breaking index | n | 2.598 (measured) | 2/2.5/3 | – | – |
| Minimum energy at injection | γmin | 1 | – | – | – |
| Containment factor | ϵ | 0.5 | – | – | – |
| SN explosion energy (erg) | Esn | 1051 | – | – | – |
| CMB temperature (K) | Tcmb | 2.73 | – | – | – |
| CMB energy density (eV cm−3) | Ucmb | 0.25 | – | – | – |
| FIR temperature (K) | Tfir | 70 | – | – | – |
| NIR temperature (K) | Tnir | 3000 | – | – | – |
Notes. The symbol “–” in the table means the value or range is the same as noted in the previous column. To make sure the τ0 will not be negative, the braking index for the sources except J1208-6238 was assumed to be 2/2.5/3, which means that with the increasing of the assumed value for ta𝑔e from 0.7 to three times τc, the braking index would be assumed as 3, 2.5, and 2, respectively.
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