Multi-wavelength properties of three new radio-powerful z ∼ 5.6 quasi-stellar objects discovered from RACS

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Table 6.

Best-fit values obtained from the fit of the Swift-XRT X-ray spectra of the targets discussed in this work.

Γ_X	Flux ^(a)	Lum. ^(b)	photon	exp. time	cstat/d.o.f.
	0.5–10 keV	2–10 keV	counts	ksec
		PSO J0202−17
1.39 $_{- 0.50}^{+ 0.48}$ $^{+0.48}_{-0.50}$	5.2 $_{- 1.8}^{+ 1.7}$ $_{-1.8}^{+1.7}$	3.4 $_{- 0.5}^{+ 1.8}$ $_{-0.5}^{+1.8}$	42	54	31 / 38
		DES J0209−56
1.38 $_{- 0.78}^{+ 0.77}$ $^{+0.77}_{-0.78}$	3.4 $_{- 1.4}^{+ 1.0}$ $_{-1.4}^{+1.0}$	2.6 $_{- 0.7}^{+ 1.6}$ $_{-0.7}^{+1.6}$	19	30	19 / 19
		PSO J1011−01
–	< 0.8 ^(c)	< 1.1 ^(c)	< 3.2	30	–

Notes. The fit was performed assuming a simple power law with Galactic absorption from HI4PI Collaboration (2016). Column (1) best-fit photon index; 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) total number of photons from the target; col. (5) c-statistic and degree of freedom of the fit. Errors and upper-limits are reported as a 90% level of confidence.

^(a)

in units of 10⁻¹⁴ erg s⁻¹ cm²;

^(b)

in units of 10⁴⁵ erg s⁻¹;

^(c)

assuming Γ_X = 1.8.

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