Slim-disk modeling reveals an accreting intermediate-mass black hole in the luminous fast blue optical transient AT2018cow

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Volume 691 (November 2024)

A&A, 691 (2024) A228

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Table B.6.

Joint fits of XMM-Newton/EPIC-pn spectra from Epochs 5 and 6.

Model	Parameter	Epoch 5	Epoch 6	Model	Parameter	Epoch 5	Epoch 6
`TBabs`	N_H (10²⁰ cm⁻²)	[5.0]		`TBabs`	N_H (10²⁰ cm⁻²)	[5.0]

`powerlaw`	Γ	$0 . 9_{- 3.1}^{+ 0.8}$ $0.9_{-3.1}^{+0.8}$	-	`powerlaw`	Γ	$0 . 7_{- 3.2}^{+ 0.8}$ $0.7_{-3.2}^{+0.8}$	-
	norm (keV⁻¹cm⁻²s⁻¹)	$(190_{- 188}^{+ 171}) \times 10^{- 8}$ $(190_{-188}^{+171})\times10^{-8}$	-		norm (keV⁻¹cm⁻²s⁻¹)	$(151_{- 149}^{+ 181}) \times 10^{- 8}$ $(151_{-149}^{+181})\times10^{-8}$	-

`slimdz`	ṁ ( ${\dot{m}}_{Edd}$ $\dot{m}_{\mathrm{Edd}}$ )	< 4.6	< 3.6	`slimbh`	L_disk (L_Edd)	< 0.60	< 0.17
	θ (°)	NC {3° ≤θ ≤ 90°}			θ (°)	NC {0° ≤θ ≤ 85°}
	log(M_•/M_⊙)	$2 . 5_{- 0.9}^{+ 1.4}$ $2.5_{-0.9}^{+1.4}$			log(M_•/M_⊙)	$2 . 2_{- 0.2}^{+ 1.0}$ $2.2_{-0.2}^{+1.0}$
	a_•	NC {−0.998 ≤ a_• ≤ 0.998}			a_•	NC {0 < a_• < 0.999}

C-stat/d.o.f.		57.7/39		C-stat/d.o.f.		57.3/39

Notes. At these two epochs, the disk is likely to be at sub–Eddington mass accretion rates. We compare the results using the slimdz model with those using the slimbh model, employing a fit function of "constant*TBabs*(powerlaw+slimdz)" and a fit function of "constant*TBabs*(powerlaw+slimbh)", respectively. The symbol "NC" means the parameter cannot be constrained within the range of values allowed by the models (listed in curly brackets).

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