Table 1
Spectral parameters of Vela shrapnel G.
| Model & Parameters | VAPEC+VAPEC | VNEI |
|
|
||
| NH [1022 cm-2] | 0.11 ± 0.01 | 0.022 ± 0.007 |
|
|
||
| kT1 [keV] | 0.194 ± 0.002 | 0.49 ± 0.02 |
| Norm1 [× 10-3] | 25 ± 3 | 2.0 ± 0.3 |
| τ [1010 s cm-3] | − | 3.1 ± 0.3 |
|
|
||
| kT2 [keV] | 0.64 ± 0.07 | − |
| Norm2 [× 10-3] | 0.66 ± 0.08 | − |
|
|
||
| O,(=N),(=C) [O⊙] | 0.38 ± 0.02 | 0.47 ± 0.05 |
| Ne [Ne⊙] | 1.14 ± 0.08 | 1.33 ± 0.10 |
| Mg [Mg⊙] | 0.99 ± 0.11 | 0.92 ± 0.12 |
| Si [Si⊙] | 2.06 ± 0.45 | 2.24 ± 0.43 |
| Fe [Fe⊙] | 0.34 ± 0.03 | 0.29 ± 0.04 |
|
|
||
 /d.o.f. |
1.50/450 | 1.41/451 |
|
|
||
| Flux (0.3−0.6 keV) | 4.49 ± 0.06 | 4.57 ± 0.06 |
| Flux (0.6−1.3 keV) | 4.75 ± 0.03 | 4.73 ± 0.03 |
| Flux (1.3−3.0 keV) | 0.33 ± 0.02 | 0.29 ± 0.01 |
|
|
||
| Total Flux (0.3−3.0 keV) | 9.57 ± 0.06 | 9.59 ± 0.06 |
Notes. Normalizations are defined as 10-14/ 4πD2 × EM, where 
is the emission measure, D is distance in [cm], nH and ne are the hydrogen and electron densities [cm-3], and V is the volume [cm3]. Considering D = 250 pc and a solid angle Ω = A/D2 = 1.17 × 10-5 sr for the spectral regions, we obtain an EM/A = 2.1 × 1017 cm-5 for the preferred VNEI model. Error values are 1σ (68%) confidence intervals for each free parameter. Fluxes are given in units of 10-12 erg cm-2 s-1 and solar abundances are taken from Anders & Grevesse (1989).
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