Table 2
Parameters of the SNR model.
| Eej (a) | η (b) | D10 (c) | δ (c) | L (d) | |
|---|---|---|---|---|---|
| Parameter value |  |
0.08 | 0.24 | 0.25 | 10 pc |
| γ-ray flux(e) | + | + | − | ||
| Spectral index(f) | + | + | − | − | + |
Notes.
(a) Explosion energy of the SN. 
erg.
(b) The acceleration efficiency η represents the ratio between the energy flux of runaway CRs and the kinetic energy flux of incoming gas onto the shock, and it remains constant through the entire SNR evolution. The total energy of all the released CRs is 23% Eej. (c) The diffusion coefficient follows a rule of D = D10Eδ, where D10 is in unit of 1028 cm2 s−1. D10 = 1 and δ = 0.3− 0.5 represent the Galactic diffusion coefficient. (d)The three dimensional distance between the SNR and CloudX2 (The projected distance is ~ 8 pc). (e) “+” / “−” means that with a increasing value of the parameter, the γ-ray flux (total energy of GeV-TeV band) of SrcX2 increases/decreases. For parameter D, both “+” and “−” could happen, that is why we leave them blank, see also the explanations in text. (f) “+” / “−” means that with a increasing value of the parameter, the γ-ray spectral index becomes harder/softer (higher/lower TeV to GeV ratio).
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