A second view on the X-ray polarization of NGC 4151 with IXPE

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Table 2.

Best fit from the spectral analysis.

Parameter	Value	Value	Value
	1st obs	X1+N1	X2+N2
`CLOUDY (Photoionized emitter)`
log U	1.35 ± 0.01	1.11 $_{- 0.02}^{+ 0.01}$ $^{+0.01}_{-0.02}$ ^( + )
log(N_H / cm⁻²)	21.63 ± 0.02	21.54 $_{- 0.02}^{+ 0.01}$ $^{+0.01}_{-0.02}$ ^( + )
`PC 1 (Neutral absorber 1)`
log(N_H /cm⁻²)	23.02 ± 0.01	23.27 ± 0.01	23.18 ± 0.01
Cf	0.78 ± 0.01	0.73 ± 0.01	0.75 ± 0.01
`PC 2 (Neutral absorber 2)`
log(N_H / cm⁻²)	22.64 ± 0.01	22.68 ± 0.01 ^( + )
Cf	0.95 ± 0.01	0.93 ± 0.01 ^( + )
`WA (Warm absorber)`
log(N_H / cm⁻²)	23.13 ± 0.03	23.59 $_{- 0.05}^{+ 0.04}$ $^{+0.04}_{-0.05}$ (+)
log(ξ / erg cm s⁻¹)	4.12 ± 0.02	4.31 ± 0.03 ^( + )
`BORUS` 1/2 (Neutral reflector 1/2)
log(N_H / cm⁻²)	24.45 ± 0.01	24.45 ^( * )
A_Fe/A_Fe, ⊙	0.62 ± 0.01	0.62 ^( * )
norm	0.09 ± 0.01	0.09 ^( * )
`nthcomp (Comptonized primary continuum)`
Γ	1.85 ± 0.01	1.88 ± 0.01	1.82 ± 0.01
kT_e [keV]	60 $_{- 6}^{+ 7}$ $^{+7}_{-6}$	60 ^( * )
norm	0.093 ± 0.001	0.067 ± 0.002	0.071 ± 0.001
χ²/d.o.f.	743/660	2556/2245	2576/2255
F_{2 − 10 keV} / [×10⁻¹⁰ erg cm⁻² s⁻¹]	1.680 ± 0.003	1.025 ± 0.004	1.277 ± 0.004
L_{2 − 10 keV} / [×10⁴² erg s⁻¹]	4.060 ± 0.006	2.477 ± 0.010	3.085 ± 0.009

Notes. ^( * ): During X1+N1 and X2+N2 data fitting, we fixed these values to those obtained in G23 best fit (we report for the first observation the uncertainties obtained in G23). ^( + ): During data fitting, we fixed the values of X2+N2 to those obtained for X1+N1, as they do not vary when left free. Normalization in units of photons s⁻¹ cm⁻² keV⁻¹. The best fit values are adopted in the spectro-polarimetric analysis.

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