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Table 3.

Background fit parameters, reduced Pearson-χ2-values, and goodness of fit values P for the four source regions around HESS J1646−458.

Parameter Region 1 Region 2 Region 3 Region 4
REGAREA [arcmin−2] 203.4 657.2 1217 1488
NH [1022 cm−2] 2.0 ± 0.1 2.0 ± 0.2 1.9 ± 0.3 1.8 ± 0.3
N H Bkg $ N_{\mathrm{H}}^{\mathrm{Bkg}} $ [1022 cm−2] 1.9 ± 0.1 1.9 ± 0.2 1.9 ± 0.3 1.7 ± 0.4
ηLHB [10−14 cm−5 arcmin−2] 6 6 + 5 · 10 − 7 $ 6_{6}^{+5}\cdot10^{-7} $ 1 . 0 − 0.3 + 0.3 · 10 − 6 $ 1.0_{-0.3}^{+0.3}\cdot10^{-6} $ 6 . 0 − 2.5 + 2.5 · 10 − 7 $ 6.0_{-2.5}^{+2.5}\cdot10^{-7} $ 8 . 5 − 2.7 + 2.2 · 10 − 7 $ 8.5_{-2.7}^{+2.2}\cdot10^{-7} $
N H CGM $ N_{\mathrm{H}}^{\mathrm{CGM}} $ [1022 cm−2] 0 . 9 − 0.9 + 0.4 $ 0.9_{-0.9}^{+0.4} $ 0.416 0 . 3 − 0.2 + 0.2 $ 0.3_{-0.2}^{+0.2} $ 0 . 4 − 0.3 + 0.2 $ 0.4_{-0.3}^{+0.2} $
ηCGM [10−14 cm−5 arcmin−2] 7 − 7 + 70 · 10 − 4 $ 7_{-7}^{+70}\cdot10^{-4} $ 5 − 2 + 2 · 10 − 5 $ 5_{-2}^{+2}\cdot10^{-5} $ 3 − 2 + 6 · 10 − 5 $ 3_{-2}^{+6}\cdot10^{-5} $ 1 . 0 − 0.7 + 2 · 10 − 4 $ 1.0_{-0.7}^{+2}\cdot10^{-4} $
N H cor $ N_{\mathrm{H}}^{\mathrm{cor}} $ [1022 cm−2] 1 . 3 − 0.4 2.02 $ 1.3_{-0.4}^{2.02} $ 0 . 9 − 0.2 + 0.2 $ 0.9_{-0.2}^{+0.2} $ 1 . 1 − 0.2 + 0.2 $ 1.1_{-0.2}^{+0.2} $ 1 . 0 − 0.2 + 0.2 $ 1.0_{-0.2}^{+0.2} $
ηcor [10−14 cm−5 arcmin−2] 1 . 3 − 0.7 + 1.0 · 10 − 5 $ 1.3_{-0.7}^{+1.0}\cdot10^{-5} $ 6 . 1 − 1.5 + 1.8 · 10 − 6 $ 6.1_{-1.5}^{+1.8}\cdot10^{-6} $ 8 . 2 − 1.4 + 1.6 · 10 − 6 $ 8.2_{-1.4}^{+1.6}\cdot10^{-6} $ 7 . 1 − 1.2 + 1.4 · 10 − 6 $ 7.1_{-1.2}^{+1.4}\cdot10^{-6} $
ηLMXB [keV−1 cm−2 s−1] 8 . 4 − 0.9 + 1.0 · 10 − 4 $ 8.4_{-0.9}^{+1.0}\cdot10^{-4} $ 2 . 4 − 0.2 + 0.2 · 10 − 3 $ 2.4_{-0.2}^{+0.2}\cdot10^{-3} $ 3 . 4 − 0.2 + 0.2 · 10 − 3 $ 3.4_{-0.2}^{+0.2}\cdot10^{-3} $ 2 . 4 − 0.2 + 0.2 · 10 − 3 $ 2.4_{-0.2}^{+0.2}\cdot10^{-3} $
χP2/ν 4485/4349 = 1.03 4369/4350 = 1.00 4467/4349 = 1.03 4456/4349 = 1.02
P 0.90 0.49 0.90 0.85

Notes. The REGAREA parameters were taken from the headers of the respective source spectrum fits files. The NH parameters are the arithmetic means and standard deviations of several equal-distance column densities determined along the four source regions via nH. For region 1, we used 5 such points, and for the other regions 7. N H Bkg $ N_{\mathrm{H}}^{\mathrm{Bkg}} $ are the same values for the four corresponding background regions. All other parameters are Xspec best-fit parameters with their respective 90% confidence intervals. All normalizations except for ηLMXB are scaled with the background area in square arcminutes. Confidence intervals given without a plus or minus indicate a hard limit allowed for the fit into which the parameter ran. For region 2, N H CGM $ N_{\mathrm{H}}^{\mathrm{CGM}} $ was fixed as described in the text.

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