The changing look of PKS 2149-306 | Astronomy & Astrophysics (A&A)

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Table 2:

Fit results.
X-rays (0.2-10 keV)
Instrument	Model	$\Gamma$ or $\Gamma_1$	Additional parameters		$F_{\rm 2-10~keV}$	$\chi^2_{\rm r}$ /d.o.f.
XMM/EPIC	`wabs*zpo`	$1.42 \pm 0.01$			$0.56 \pm 0.01$	1.08/977
Swift/XRT (OBS. 1)	`wabs*zpo`	$1.44\pm 0.07$			$1.2 \pm 0.1$	1.24/29
Swift/XRT (OBS. 2)	`wabs*zpo`	$1.38 \pm 0.09$			$\rm 1.04^{+0.06}_{-0.09}$	1.63/15
	`wabszwabszpo`	$\rm 1.55^{+0.17}_{-0.16}$	$N_z=1.0^{\rm +1.1}_{-0.8}$ 10²² cm^-2		$\rm0.97^{+0.5}_{-0.08}$	1.42/14
	`wabs*bknpo`	$\rm0.98_{-0.41}^{+0.29}$	$E_{\rm break}= 1.9_{\rm -0.6}^{+1.5}$ keV	$\Gamma_2=1.86_{-0.31}^{+1.19}$	$0.8 \pm 0.1$	0.98/13
Hard X-rays (20-100 keV)
Instrument	Model	$\Gamma$			$F_{\rm 20-100~keV}$	$\chi^2_{\rm r}$ /d.o.f.
INTEGRAL/ISGRI	`zpo`	1.5_-0.8^+0.9			$2.1 \pm 0.2$	0.51/3
Swift/BAT	`zpo`	$1.5\pm 0.4$			$4.8 \pm 0.5$	0.48/2
Joint fit (0.2-100 keV)
Instrument	Model	$\Gamma$ or $\Gamma_1$	Additional parameters		$F_{\rm 2-100~keV}$	$\chi^2_{\rm r}$ /d.o.f.
EPIC+ISGRI	`wabs*zpo`	$1.42 \pm 0.01$			$\rm 3.13^{+0.05}_{-0.04}$	1.08/980
XRT (OBS. 1) + BAT	`wabs*zpo`	$1.44\pm 0.07$			$\rm 6.4^{+0.9}_{-0.8}$	1.2/32
XRT (OBS. 2) + BAT	`wabs*bknpo`	$\rm0.9^{+0.3}_{-0.4}$	$E_{\rm break}=1.6^{\rm +0.9}_{-0.4}$ keV	$\Gamma_2=1.7^{+0.3}_{-0.2}$	$3 \pm 1$	0.92/16

Models and parameters for single instruments and joint fit. Applied models are: a power-law in the source rest frame (zpo), a power-law with an absorption component in the object rest frame (zwabs*zpo) and a broken power-law (bknpo). All models include Galactic absorption (wabs) with column density $N_{\rm H}=1.63\times 10^{20}$ cm^-2 (Kalberla et al. 2005). Flux is given in units of 10^-11 erg cm^-2 s^-1.

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