An extreme particle accelerator in the Galactic plane: HESS J1826−130

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Table 2

Comparison of different spectral models fit to the data in the energy range of [0.4, 56.2] TeV, together with the spectral parameter values.

Spectral model	Flux (1 TeV)	Int. flux(> 1 TeV)	Parameters	−2*Loglike	χ²∕n.d.f.
	× 10⁻¹³ cm⁻² s⁻¹ TeV⁻¹	× 10⁻¹³ cm⁻² s⁻¹		(LLRT)	(p-val)
Power law	11.1 ± 0.6	9.8 ± 0.4	Γ = 2.12 ± 0.04	44.015	37.3 / 10
		(4.7% Crab)		(nested)	(5 × 10⁻⁵)

Exp. cut-off	10.1 ± 0.7	10.2 ± 0.5	Γ = 1.78 ± 0.10	33.566	9.3 / 9
power law		(4.9% Crab)	λ = 0.0659 ± 0.0177 (TeV⁻¹)	(3.2 σ)	(0.41)

Broken	10.2 ± 0.7	10.1 ± 0.5	Γ₁ = 1.96 ± 0.06	32.577	8.6 / 8
power law		(4.8% Crab)	Γ₂ = 3.59 ± 0.69	(n/a)	(0.38)
			E_br = 11.2 ± 2.7 (TeV)

Notes. In all cases, statistical errors are quoted, while systematics errors are 20% for flux and 0.2 for spectral indices. The likelihoods and p-values are given for each model for comparison.

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