Ultraluminous X-ray sources: new distance indicators?

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Volume 612 (April 2018)

A&A, 612 (2018) L12

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Table 2

Results from fitting each source with the tbnew*nsmcbb model.

Src.	Parameter	Value	Unit
P13	χ² ∕d.o.f.	1344/1245	–

	F_X (2–10 keV)	4.36 × 10⁻¹²	erg s⁻¹ cm⁻²

	F_X (0.3–30 keV)	6.83 × 10⁻¹²	erg s⁻¹ cm⁻²

		3.41	Mpc

	L_X (0.3–30 keV)	9.59 × 10³⁹	erg s⁻¹

ULX1	χ² ∕d.o.f.	867/859	–

	F_X (2–10 keV)	1.73 × 10⁻¹²	erg s⁻¹ cm⁻²

	F_X (0.3–30 keV)	2.81 × 10⁻¹²	erg s⁻¹ cm⁻²

			Mpc

	L_X (0.3–30 keV)	1.49 × 10⁴⁰	erg s⁻¹

ULX5	χ² ∕d.o.f.	872/762	–

	F_X (2–10 keV)	5.78 × 10⁻¹²	erg s⁻¹ cm⁻²

	F_X (0.3–30 keV)	9.18 × 10⁻¹²	erg s⁻¹ cm⁻²

			Mpc

	L_X (0.3–30 keV)	7.49 × 10³⁹	erg s⁻¹

Notes. Unabsorbed fluxes are calculated using the standard XSPEC command. The distance to the source is determined from the normalization of the model. Finally, the X-ray luminosity is computed.

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