Probing the gamma-ray emission from HESS J1834–087 using H.E.S.S. and Fermi LAT observations

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Volume 574 (February 2015)

A&A, 574 (2015) A27

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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	S_improv^a	N_par^b	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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