Discovery of EP J175257.3–351923 as a candidate black hole low-mass X-ray binary

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Table D.2.

Best-fitting spectral parameters of the joint Swift/XRT and NuSTAR spectra.

Component	Parameter	Value
Constant	factor (FPMA)	1 (frozen)
	factor (FPMB)	1.024 ± 0.007
	factor (XRT₀₆)	$0 . 95_{- 0.03}^{+ 0.02}$ $Mathematical equation: $ 0.95_{-0.03}^{+0.02} $$
	factor (XRT₀₇)	0.91 ± 0.03

TBabs	N_H (10²² cm⁻²)	0.90 ± 0.05

Cutoffpl	Γ	$2 . 08_{- 0.03}^{+ 0.02}$ $Mathematical equation: $ 2.08_{-0.03}^{+0.02} $$
	E_cut (keV)	$217_{- 50}^{+ 72}$ $Mathematical equation: $ 217_{-50}^{+72} $$
	norm (photons/keV/cm²)	$0 . 157_{- 0.007}^{+ 0.004}$ $Mathematical equation: $ 0.157_{-0.007}^{+0.004} $$

Relxill	q₁	3 (frozen)
	q₂	3 (frozen)
	R_br (R_g)	1000 (frozen)
	a	0.998 (frozen)
	Inclination (°)	$58_{- 31}^{+ 16}$ $Mathematical equation: $ 58_{-31}^{+16} $$
	R_in (R_g)	100 (frozen)
	R_out (R_g)	1000 (frozen)
	z	0 (frozen)
	Γ	=Γ_cutoffpl
	log ξ	$1 . 70_{- 0.35}^{+ 0.09}$ $Mathematical equation: $ 1.70_{-0.35}^{+0.09} $$
	A_Fe	< 0.6
	E_cut (keV)	=E_cutoffpl
	Reflection fraction	−1 (frozen)
	norm (10⁻⁴)	$2 . 1_{- 1.0}^{+ 0.6}$ $Mathematical equation: $ 2.1_{-1.0}^{+0.6} $$

Diskbb	T_in (keV)	0.083 ± 0.004
	norm (10⁷) [(R_in/D₁₀)² cos θ]	$3 . 1_{- 1.5}^{+ 1.9}$ $Mathematical equation: $ 3.1_{-1.5}^{+1.9} $$

	χ²/d.o.f	1853/1662

Notes. The spectra are jointly fitted with the model constant*tbabs*(cutoffpl+relxill+diskbb). Errors are given at the 90% confidence level. XRT₀₆ and XRT₀₇ correspond to Swift/XRT ObsIDs 03000100006 and 03000100007.

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