Hard X-ray view of two γ-ray-detected low-luminosity active galactic nuclei: NGC 315 and NGC 4261

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Table 4.

Best-fit parameters of the spectral analysis for NGC 315.

NGC 315	PL	Cutoff PL	pexmon	MYTorus	zbremss	compTT(slab)	compTT(sphere)
N_H (10²² cm⁻²)	0.15 ± 0.02	0.09 ± 0.02	0.09 ± 0.04	0.14 ± 0.05	0.06 ± 0.02	$0 . 15_{- 0.04}^{+ 0.05}$ $0.15^{+0.05}_{-0.04}$	$0 . 15_{- 0.04}^{+ 0.05}$ $0.15^{+0.05}_{-0.04}$
kT (keV, mekal)	0.70 ± 0.01	0.70 ± 0.01	0.71 ± 0.01	0.70 ± 0.01	0.71 ± 0.01	0.70 ± 0.01	0.70 ± 0.01
Γ	1.61 ± 0.03	$1 . 35_{- 0.07}^{+ 0.06}$ $1.35^{+0.06}_{-0.07}$	1.31 ± 0.10	$1 . 68_{- 0.12}^{+ 0.11}$ $1.68^{+0.11}_{-0.12}$
E_cut (keV)		$18 . 45_{- 4.51}^{+ 8.00}$ $18.45^{+8.00}_{-4.51}$	$14 . 16_{- 2.32}^{+ 3.23}$ $14.16^{+3.23}_{-2.32}$	18.45(f)
E_gaussian (keV)	6.34 ± 0.09	6.35 ± 0.10			6.35 ± 0.10	6.34 ± 0.09	6.34 ± 0.09
σ_gaussian (keV)	$0 . 26_{- 0.08}^{+ 0.10}$ $0.26^{+0.10}_{-0.08}$	$0 . 23_{- 0.08}^{+ 0.09}$ $0.23^{+0.09}_{-0.08}$		$0 . 20_{- 0.08}^{+ 0.010}$ $0.20^{+0.010}_{-0.08}$	$0 . 23_{- 0.08}^{+ 0.09}$ $0.23^{+0.09}_{-0.08}$	$0 . 26_{- 0.10}^{+ 0.08}$ $0.26^{+0.08}_{-0.10}$	$0 . 26_{- 0.10}^{+ 0.08}$ $0.26^{+0.08}_{-0.10}$
EW (keV)	0.48 ± 0.12	$0 . 38_{- 0.10}^{+ 0.11}$ $0.38^{+0.11}_{-0.10}$		$0 . 37_{- 0.10}^{+ 0.11}$ $0.37^{+0.11}_{-0.10}$	$0 . 36_{- 0.10}^{+ 0.11}$ $0.36^{+0.11}_{-0.10}$	0.47 ± 0.12	$0 . 47_{- 0.11}^{+ 0.12}$ $0.47^{+0.12}_{-0.11}$
R			$0 . 61_{- 0.17}^{+ 0.18}$ $0.61^{+0.18}_{-0.17}$
kT (keV, zbremss/compTT)					$16 . 96_{- 1.81}^{+ 2.20}$ $16.96^{+2.20}_{-1.81}$	40–70 ^( * )	40–75 ^( * )
τ						0.7–1.7 ^( * )	1.8–4.0 ^( * )
F_{0.5 − 10 keV} (10⁻¹³ erg cm⁻² s⁻¹)	$8 . 23_{- 0.19}^{+ 0.20}$ $8.23^{+0.20}_{-0.19}$	7.91 ± 0.20	8.10 ± 0.20	$6 . 69_{- 0.58}^{+ 0.60}$ $6.69^{+0.60}_{-0.58}$	$7 . 79_{- 0.19}^{+ 0.20}$ $7.79^{+0.20}_{-0.19}$	8.20 ± 0.19	8.22 ± 0.20
F_{0.5 − 30 keV} (10⁻¹³ erg cm⁻² s⁻¹)	10.08 ± 0.27	$9 . 59_{- 0.32}^{+ 0.33}$ $9.59^{+0.33}_{-0.32}$	9.82 ± 0.32	7.29 ± 0.66	9.33 ± 0.29	$10 . 12_{- 0.24}^{+ 0.25}$ $10.12^{+0.25}_{-0.24}$	$10 . 17_{- 0.24}^{+ 0.25}$ $10.17^{+0.25}_{-0.24}$

χ²/d.o.f.	248.35/218	240.89/217	242.84/218	239.34/217	241.23/218	246.90/217	247.11/217

Notes. ^( * )Error range at a 3σ confidence level calculated using the steppar command.

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