Comprehensive view of a z ∼ 6.5 radio-loud quasi-stellar object: From the radio to the optical/NIR to the X-ray band

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Table 1.

Best-fit values obtained from the fit of the X-ray spectrum of VIK J2318−31 assuming a simple power law with Galactic absorption (N_H = 1.13 × 10²⁰ cm⁻²; HI4PI Collaboration 2016).

Γ	f_{0.5 − 7 keV}^(a)	L_{2 − 10 keV}^(b)	${\tilde{α}}_{ox}$ $\tilde{\alpha}_{\mathrm{ox}}$	cstat/d.o.f.
2.7 $_{- 1.0}^{+ 1.1}$ $^{+1.1}_{-1.0}$	3.3 $_{- 0.9}^{+ 1.8}$ $_{-0.9}^{+1.8}$	1.7 $_{- 1.3}^{+ 4.1}$ $_{-1.3}^{+4.1}$	1.42 $_{- 0.04}^{+ 0.05}$ $_{-0.04}^{+0.05}$	8.7 / 10
2.0 ^(c)	3.2 $_{- 0.9}^{+ 0.9}$ $^{+0.9}_{-0.9}$	0.9 $_{- 0.4}^{+ 0.6}$ $^{+0.6}_{-0.4}$	1.44 $_{- 0.04}^{+ 0.04}$ $_{-0.04}^{+0.04}$	9.2 / 11

Notes. Column (1) best-fit photon index (top) and fixed value (bottom); Col. (2) un-absorbed flux in the energy band 0.5–10 keV; Col. (3) rest-frame luminosity in the energy range 2–10 keV; Col. (4) ${\tilde{α}}_{ox}$ $\tilde{\alpha}_{\mathrm{ox}}$ parameter; Col. (5) C-statistic and degrees of freedom of the fit. Errors are reported at 1σ level of confidence.

^(a)

In units of 10⁻¹⁵ erg s⁻¹ cm².

^(b)

In units of 10⁴⁵ erg s⁻¹.

^(c)

Assumed to vary by ±0.5 in the flux and luminosity uncertainty computation.

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