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Table 1

Centroid (Galactic coordinates) and extension fits to the H.E.S.S. events spatial distribution in the W41 region.

Model tested TS Simprova Nparb l [°] b [°] σ [°]c

(A) Point-like 3 23.222 ± 0.004 −0.268 ± 0.004

(B) Gaussian 566.4 23.8 4 23.22 ± 0.01 −0.31 ± 0.01 0.15 ± 0.01

Point-like 31.6 5.0 7 23.23 ± 0.01 −0.26 ± 0.01
(C) +
Gaussian 23.22 ± 0.01 −0.32 ± 0.01 0.17 ± 0.01

Notes. The errors given are statistical only. The test statistic (TS; defined in Sect. 3.2) quantifies the improvement of a model to a more complex one.

(a)

Significance of the improvement for each of the alternative models with respect to the previous less complex model.

(b)

Number of free parameters.

(c)

σ is the intrinsic size of the source, i.e., PSF-substracted.

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