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Table 3

Best-fit results of the XMM-Newton EPIC-pn spectra of NGC 985.

Model Parameter Obs. 2003 Obs. 2013 Obs. 2015a Obs. 2015b
Power-law F (0.3−10 keV) a
Γ b 2.14 ± 0.02 2.22 ± 0.02
E 0 c 2.69 ± 0.15 4.54 ± 0.17 3.54 ± 0.07
ΔΓ d −0.37 ± 0.07 −0.42 ± 0.02 −0.37 ± 0.02
Mod. BB F (0.3−10 keV) a 9.3 ± 1.6 × 10-13 1.7 ± 0.1 × 10-12 2.5 ± 0.2 × 10-12
T e 0.232 ± 0.007 0.211 ± 0.004 0.160 ± 0.005 0.146 ± 0.003
Gauss F line a 2.4 ± 0.3 × 10-13 1.8 ± 0.2 × 10-13 1.9 ± 0.2 × 10-13 1.5 ± 0.2 × 10-13
E f 6.48 ± 0.02 6.47 ± 0.02 6.50 ± 0.01 6.47 ± 0.02
FWHM g 0.39 ± 0.06 0.22 ± 0.04 0.28 ± 0.04 0.21 ± 0.05
xabs 1 log ξ h 2.84 ± 0.03 2.86 ± 0.03 2.81 ± 0.01 2.78 ± 0.02
N H i 2.1 ± 1.0 × 1022 2.4 ± 0.3 × 1022
xabs 2 log ξ h 1.88 ± 0.02 1.83 ± 0.06 2.03 ± 0.02 2.18 ± 0.09
N H i 1.8 ± 0.2 × 1022 1.0 ± 0.3 × 1022 8.8 ± 0.8 × 1021
xabs 3 log ξ h ... 1.29 ± 0.12 1.80 ± 0.05
N H i ... 1.3 ± 0.4 × 1021
xabs 4 log ξ h −1.29 ± 0.12 −0.94 ± 0.13 −0.84 ± 0.24
(Obscurer) N H i 2.1 ± 0.2 × 1022
f C j 0.92 ± 0.01 0.30 ± 0.04 0.18 ± 0.03
χ2/d.o.f. 200/212 262/208 300/223 298/225

Notes.

(a)

Observed flux, in units of erg cm s-1;

(b)

power-law photon index, corresponds to the slope of the low-energy branch;

(c)

power-law energy break, in units of keV;

(d)

power-law photon index break, corresponds to the slope of the high-energy branch of the spectrum when substracted from Γ;

(e)

modified black body temperature, in units of keV;

(f)

line energy, in units of keV;

(g)

line FWHM, in units of keV;

(h)

ionization parameter, in units of erg cm s-1;

(i)

hydrogen column density, in units of cm-2;

(j)

covering factor.

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