The first all-sky survey of star-forming galaxies with eROSITA - Scaling relations and a population of X-ray luminous starbursts

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Table 4.

Best-fitting model spectral parameters for the average X-ray spectrum of all the HEC-eR1 star-forming galaxies.

Spectral model: Absorption × (power law + APEC)
Spectral parameter	Value	Units

Γ	$1 . 75_{- 0.07}^{+ 0.12}$ $1.75^{+0.12}_{-0.07}$
kT	$0 . 70_{- 0.07}^{+ 0.06}$ $0.70^{+0.06}_{-0.07}$	keV
N_H	$0 . 001_{-}^{+ 0.016}$ $0.001^{+0.016}_{-}$	10²² cm⁻²
power-law norm	$1 . 91_{- 0.07}^{+ 0.12}$ $1.91^{+0.12}_{-0.07}$	10⁻⁶ phs/s/keV/cm²
APEC norm ^( * )	$2 . 09_{- 0.36}^{+ 0.36}$ $2.09^{+0.36}_{-0.36}$	10⁻⁷

Reduced – χ² (0.6–2.3 keV)	0.653
Total exposure time	3686	ks

Notes. ^( * )The APEC normalisation is in units of $\frac{10^{- 14}}{4 π {[D_{A} (1 + z)]}^{2}} \int n_{e} n_{H} d V$ $\frac{10^{-14}}{4\pi[D_{A}(1+z)]^{2}}\int n_{\mathrm{e}}n_{\mathrm{H}}dV$ , where D_A is the angular diameter distance to the source (cm), dV is the volume element (cm³), and n_e and n_H are the electron and H densities (cm⁻³), respectively.

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