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Table 3.

Spectral fits with the optxagnf model to UV and X-ray data of XMMSL2 J1446+68.

Date MBH log L/Ledd(a) rcor(b) τ(c) Lbol χ2/d.o.f.
(M⊙) (Rg) ergs s−1
2016-09-08 5 × 106 46.3 ± 8.0 1.0 × 1043 191/89
2017-08-14 5 × 106 3.4 × 1042 8/15
2016-09-08 7 × 107 −2.83 ± 0.02 2.29 ± 0.04 1.3 × 1043 215/89
2017-08-14 7 × 107 4.1 × 1042 10/15

Notes. Fit to the galaxy-subtracted UVM2 and UVW2 filter count rates and the X-ray spectrum from the XMM-Newton observation of 2016-09-08 and the Swift observation of 2017-08-14 with the optxagnf (Done et al. 2012) model. The hard power-law fraction is set to zero, the electron temperature (kTe) is fixed at 10 keV, the disc outer radius is fixed at 103Rg, and a Schwarzschild non-spinning black hole is assumed.

(a)

Log of the accretion rate in units of the Eddington limit.

(b)

The disc radius at which the transition from colour-corrected black-body emission to a Comptonised spectrum occurs in units of the gravitational radius (GM/c2). The model applies a hard cut-off at 100 Rg.

(c)

The optical depth of the 10 keV electrons.

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