Long-term X-ray spectral evolution of ultraluminous X-ray sources: implications on the accretion flow geometry and the nature of the accretor

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Volume 649 (May 2021)

A&A, 649 (2021) A104

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Table 4.

Results of the L–T correlation for the soft thermal component.

Source	Spearman	p-value	α
NGC 7793 P13	−0.13	0.73	– ^(a)
NGC 5907 ULX1	0.57	0.14	– ^(a)
NGC 5408 X-1	−0.14	0.65	– ^(a)
Circinus ULX5	0.32	0.5	– ^(a)
HoIX X-1	0.87	0.0005	1.31 ± 0.14
M 81 X-6	0.65	0.04	– ^(b)
IC 342 X-1	0.67	0.05	1.27 ± 0.28
NGC 1313 X-1	0.68	0.001	1.69 ± 0.13
NGC 5204 X-1	0.80	0.00001	3.55 ± 0.43
Ho II X-1	0.96	0.0005	3.26 ± 0.39
NGC 1313 X-2	0.25	0.21	– ^(a)
NGC 6946 X-1	0.45	0.26	– ^(a)
M 83 ULX1	0.71	0.11	– ^(a)
M 51 ULX-7	−0.22	0.52	– ^(a)
M 51 ULX-8	0.54	0.108	– ^(a)

Notes. We quote the Spearman’s rank correlation coefficient, the false-alarm probability (p-value) and the index (α) of the L ∝ T^α relationship with its 90% confidence level uncertainty.

^(a)

Non-correlated source.

^(b)

Not considered correlated due to uncertainties.

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