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Home All issues Volume 551 (March 2013) A&A, 551 (2013) A95 Full HTML
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Table 1

Fit results of continuum models of Ark 564.

Model Parameters χ2/d.o.f.
Γx N a kT(eV) N bb b
PLhard+BB 2.5f 10f 120 ± 1 3.1 ± 0.1 1063.52/441
Γx N a kT(eV) N bb b
PLfree+BB 2.82 ± 0.01 11.8 ± 0.2 139 ± 6 1.0 ± 0.2 684.06/439
Γx N a kT1(eV) N(1)bbb kT2(eV) N(2)bbb
PLhard+2BB 2.5f 10f 2.5 ± 0.1 39 ± 2 9.9 ± 3.0 583.38/439
Γx(1) N(1)a Γx(2) N(2)a
PLhard+PLsoft 2.5f 10f 3.56 ± 0.03 3.3 ± 0.1 1177.23/441
Γx(1) N(1)a Γx(2) N(2)a
PLfree+PLsoft 2.88 ± 0.01 13.1 ± 0.1 − 1.60+ 0.60 .. 864.79/439
Γx N a Eedge (keV) τ
PLfree+Ed 2.88 ± 0.01 13.7 ± 0.1 1.26 ± 0.01 0.25 ± 0.03 739.41/439
Γx N a Eedge1 (keV) τ 1 Eedge2 (keV) τ 2
PLfree+2Ed 2.79 ± 0.01 13.9 ± 0.1 1.27 ± 0.01 1.07 ± 0.01 0.12 ± 0.03 703.93/437
Γx N a c f
PLfree+Cov 2.89 ± 0.01 0.36 ±  + 0.12 856.21/439
Γx N a c f 1 c f 2
PLfree+2Cov 2.89 ± 0.01 0.36 ±  + 0.12 8 0.2 856.42/437
Γx N a kT(eV) N bb b c f
PLfree+BB+Cov 28 ± 5 175 ± 6 2.4 ± 0.3 0.7 ± 0.1 615/437
Γx N a kT1(eV) N(1)bbb kT2(eV) N(2)bbb c f
PLfree+2BB+Cov 2.79 ± 0.09 15 ± 1 0.8 ± 0.1 568.25/435

Notes. All the parameters are reported in rest frame. Errors are 90% confidence intervals.

(a)

Power-law normalization, ×10-3 photons keV-1 cm-2 s-1 at 1 keV.

(b)

Black-body normalization, ×10-4 in units of , where L39 is the luminosity of the source in units of 1039 erg  s-1, and D10 the distance to the source in units of 10 kpc.

(c)

Column density, × 1022 cm-2.

(f)

means that the parameter has been fixed.

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