X-ray spectropolarimetric characterization of GX 340+0 in the horizontal branch: A highly inclined source?

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Volume 691 (November 2024)

A&A, 691 (2024) A253

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Table 3.

Best-fit parameters of the spectral models applied to the joint data from NICER, NuSTAR, and IXPE.

Model	Parameter (units)	Model A	Model B
`TBabs`	N_H (10²² cm⁻²)	$8 . 58_{- 0.08}^{+ 0.09}$ $8.58_{-0.08}^{+0.09}$	$8 . 70_{- 0.05}^{+ 0.03}$ $8.70_{-0.05}^{+0.03}$

`diskbb`	kT_in (keV)	0.87 ± 0.06	$1 . 36_{- 0.02}^{+ 0.04}$ $1.36_{-0.02}^{+0.04}$
	norm ([R_in/D₁₀]²cosθ)	$670_{- 110}^{+ 280}$ $670_{-110}^{+280}$	$166_{- 15}^{+ 7}$ $166_{-15}^{+7}$

`comptt`	T₀ (keV)	1.19 ± 0.03	$1 . 90_{- 0.07}^{+ 0.06}$ $1.90_{-0.07}^{+0.06}$
	kT (keV)	$3 . 5_{- 0.10}^{+ 0.06}$ $3.5_{-0.10}^{+0.06}$	$3 . 3652_{- 0.0011}^{+ 0.0004}$ $3.3652_{-0.0011}^{+0.0004}$
	τ	$4 . 8_{- 0.05}^{+ 0.17}$ $4.8_{-0.05}^{+0.17}$	$3 . 7_{- 0.2}^{+ 0.9}$ $3.7_{-0.2}^{+0.9}$
	norm	0.70 ± 0.02	$0 . 278_{- 0.006}^{+ 0.040}$ $0.278_{-0.006}^{+0.040}$

`Gaussian`	E (keV)	$6 . 65_{- 0.06}^{+ 0.05}$ $6.65_{-0.06}^{+0.05}$	–
	σ (keV)	$0 . 50_{- 0.10}^{+ 0.06}$ $0.50_{-0.10}^{+0.06}$	–
	norm (photon cm⁻² s⁻¹)	0.0043 ± 0.0005	–
	Equivalent width (eV)	38 ± 8	–

`relxillNS`	Emissivity	–	[3.0]
	R_in (`ISCO`)	–	[1.44]
	R_out (GM/c²)	–	[1000]
	Inclination (deg)	–	$36 . 7_{- 1.4}^{+ 2.9}$ $36.7_{-1.4}^{+2.9}$
	logξ	–	$2 . 72_{- 0.14}^{+ 0.10}$ $2.72_{-0.14}^{+0.10}$
	A_Fe	–	$0 . 70_{- 0.19}^{+ 0.33}$ $0.70_{-0.19}^{+0.33}$
	logN	–	[19]
	norm	–	$0 . 0032_{- 0.0006}^{+ 0.0010}$ $0.0032_{-0.0006}^{+0.0010}$

χ²/d.o.f.		1470/1394 = 1.05	1535/1406 = 1.09

Cross normalization factors
	C_NICER	1.0	1.0
	C_{NuSTAR − A}	1.15 ± 0.02	1.031 ± 0.004
	C_{NuSTAR − B}	1.24 ± 0.02	$1 . 110_{- 0.010}^{+ 0.002}$ $1.110_{-0.010}^{+0.002}$
	C_{IXPE − DU1}	0.749 ± 0.015	0.699 ± 0.003
	C_{IXPE − DU2}	0.760 ± 0.015	0.708 ± 0.003
	C_{IXPE − DU3}	0.749 ± 0.015	$0 . 697_{- 0.004}^{+ 0.002}$ $0.697_{-0.004}^{+0.002}$

Photon flux ratios in 2–8 keV
	F_diskbb/F_tot	0.210	0.540
	F_comptt/F_tot	0.784	0.337
	F_{gauss, relxillNS}/F_tot	0.006	0.123

Notes. The estimated flux in 2–8 keV is 5 × 10⁻⁹ erg s⁻¹ cm⁻². The errors are reported at 90% CL.

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