Analysis of extremely low signal-to-noise ratio data from INTEGRAL/PICsIT

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Table 4:

Cross-calibration between the INTEGRAL high-energy instruments. A power-law model was fitted to the Crab (three upper rows) and Cen A (three lower rows) spectra. The best-fit parameters for Crab are: a photon index $\Gamma$ of $2.19 \pm 0.01$ and a normalization at 1 keV of $17.1\pm 0.5$ photons keV^-1 cm^-2 s^-1 with a reduced $\chi ^{2}$ of 1.71 for 49 degrees of freedom. The best-fit parameters for Cen A: a photon index $\Gamma$ of $1.80 \pm 0.01$ and a normalization at 1 keV of $0.153 \pm 0.006$ photons keV^-1 cm^-2 s^-1 with a reduced $\chi ^{2}$ of 1.16 for 61 degrees of freedom. No systematic errors were added to the statistical ones.
Instrument	Exposure	Energy range	Rel. norm.
	[ks]	[keV]
ISGRI	1168	100-462	0.875 $\pm$ 0.003
SPI	910	105-957	(1.00)
PICsIT	981	277-930	0.75 $\pm$ 0.01
ISGRI	771	19-462	0.89 $\pm$ 0.02
SPI	584	26-352	(1.00)
PICsIT	429	277-454	0.85 $\pm$ 0.13

Source LaTeX | All tables | In the text

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