Identification of three new ultraluminous X-ray sources in NGC 4631 and NGC 1097: Evidence for stellar-mass black holes

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Table 3.

Parameters of NGC 1097 ULX-3 from the tbabs*tbabs*(power-law+bbody) model, using the XMM-Newton MOS spectrum.

Parameters	Units	Values
N_H (a)	10²² × (cm⁻²)	$0 . 09_{- 0.02}^{+ 0.03}$ $Mathematical equation: $ 0.09^{+0.03}_{-0.02} $$
Γ		$1 . 42_{- 0.28}^{+ 0.33}$ $Mathematical equation: $ 1.42^{+0.33}_{-0.28} $$
N_norm	10⁻⁵ × (keV⁻¹ cm⁻² s⁻¹)	$2 . 46_{- 0.48}^{+ 0.55}$ $Mathematical equation: $ 2.46^{+0.55}_{-0.48} $$
kT	keV	$0 . 15_{- 0.04}^{+ 0.05}$ $Mathematical equation: $ 0.15^{+0.05}_{-0.04} $$
N_norm	10⁻⁶ × (L₃₉/D₁₀²)	$1 . 3_{- 0.77}^{+ 0.90}$ $Mathematical equation: $ 1.3^{+0.90}_{-0.77} $$
F_X(b)	10⁻¹³ × (erg cm ⁻² s⁻¹)	$2 . 05_{- 0.07}^{+ 0.09}$ $Mathematical equation: $ 2.05^{+0.09}_{-0.07} $$
L_X(c)	10³⁹ × (ergs s⁻¹)	$10 . 60_{- 2.50}^{+ 2.90}$ $Mathematical equation: $ 10.60^{+2.90}_{-2.50} $$
χ²/d.o.f.		56.87/53

Notes. (a) Intrinsic hydrogen column density (N_H) obtained from the spectral fit, with the Galactic absorption fixed at N_H, Gal = 0.013 × 10²² cm⁻². (b) Absorbed flux in the 0.3–10 keV band. (c) Unabsorbed luminosity in the 0.3–10 keV band, assuming a distance of 16.8 Mpc. All uncertainties are quoted at the 90% confidence level.

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