INTEGRAL observations of the Perseus cluster

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Table 1:

Results of the fitting procedure to the joint ISGRI/JEM-X spectrum with different models.
#	Model	$\chi^2$ /d.o.f.	kT [keV]	Additional parameters
1	MEKAL	108.9/24	4.4
2	MEKAL+power-law	25.5/22	$3.66\pm0.12$	$\Gamma=2.75_{-0.18}^{+0.16}$
3	MEKAL+NGC 1275^a	55.9/24	4.1
4	MEKAL+NT^b	118.7/24	3.3
5	MEKAL+MEKAL+NGC 1275^a	23.9/22	$3.41\pm0.15$	kT₂=11_-3⁺⁴
6	MEKAL+cutoffpl^c+NGC 1275^a	25.0/22	$3.48\pm0.13$	$E_{\rm cut}=16_{-4}^{+6}$

^a Fixed to the value reported in Churazov et al. (2003).
^b Fixed to the parameters extracted by Sanders et al. (2005).
^c Photon index of the cut-off power law fixed to $\Gamma=2.0$ .

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