Soft gamma-ray sources detected by INTEGRAL | Astronomy & Astrophysics (A&A)

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Table 2:

Spectral fit parameters for sources other than X-ray binaries.
Object	Instru-	Spectral Model Fit Results^a
	ment	$\Gamma_1$	$E_{{\rm cutoff}}$	$E_{{\rm break}}$	$\Gamma_2$	Norm	$\chi^2$ /d.o.f.
			[keV]	[keV]		[keV^-1 cm^-2 s^-1]
Crab	SPI	2.11 $\pm$ 0.01	-	81 $\pm$ 11	2.20 $\pm$ 0.01	11.6 $\pm$ 0.5	0.5
Crab	ISGRI	2.119 $\pm$ 0.006	-	96 $\pm$ 4	2.36 $\pm$ 0.02	10.7 $\pm$ 0.3	1.2
Vela Pulsar	SPI	2.13 $\pm$ 0.10	-	-	-	0.12 $\pm$ 0.05	0.55
Vela Pulsar	ISGRI	2.04 $\pm$ 0.04	-	-	-	0.056 $\pm$ 0.008	1.4
NGC 4151	SPI	2.10 $\pm$ 0.17	-	-	-	0.4 $\pm$ 0.25	1.4
NGC 4151	ISGRI	2.03 $\pm$ 0.06	-	-	-	0.24 $\pm$ 0.05	1.4
NGC 4945	SPI^b	1.7 $\pm$ 0.17	150	-	-	0.06 $\pm$ 0.04	0.4
NGC 4945	ISGRI^b	1.56 $\pm$ 0.05	150	-	-	0.033 $\pm$ 0.006	0.6
Cen A	SPI	1.89 $\pm$ 0.05	-	-	-	0.20 $\pm$ 0.04	1.2
Cen A	ISGRI	1.80 $\pm$ 0.02	-	-	-	0.117 $\pm$ 0.009	0.9
Swift J1656.3-3302	SPI	1.5 $\pm$ 0.2	-	-	-	0.004 $\pm$ 0.004	1.0
Swift J1656.3-3302	ISGRI^c	-	-	-	-	-	-

^a Spectral parameters not used in the model for a particular object are marked as ``-''; ^b fit model also included the strong photoelectric absorption with $N_{\rm H}$ fixed to 5.5 $\times$ 10²⁴ cm^-2; ^c ISGRI spectral fit failed, see Sect. 4.8.

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