Correlated spectro-polarimetric study along the Z track in XTE J1701–462 puts constraints on its coronal geometry

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Volume 695 (March 2025)

A&A, 695 (2025) A108

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Table 2.

Best-fitting spectral parameters of Model 1. The data of BOX1 and BOX2 are from Insight-HXMT, while BOX3 is from NuSTAR. Uncertainties are given at a 90% confidence level for one parameter of interest.

Model 1 : tbabs(diskbb+thcompbbodyrad+gaussian)
Parameters	BOX1	BOX2	BOX3

tbabs
N_H (10²²cm⁻²)		1.96^*

diskbb
kT_in (keV)	$1 . 13_{- 0.06}^{+ 0.05}$ $1.13_{-0.06}^{+0.05}$	$1 . 17_{- 0.06}^{+ 0.06}$ $1.17_{-0.06}^{+0.06}$	$0 . 71_{- 0.02}^{+ 0.02}$ $0.71_{-0.02}^{+0.02}$
R_in (km)^a	$16 . 1_{- 0.9}^{+ 1.2}$ $16.1_{-0.9}^{+1.2}$	$14 . 5_{- 0.2}^{+ 0.3}$ $14.5_{-0.2}^{+0.3}$	$59 . 2_{- 2.5}^{+ 2.3}$ $59.2_{-2.5}^{+2.3}$

thComp
Γ	$2 . 16_{- 0.04}^{+ 0.09}$ $2.16_{-0.04}^{+0.09}$	$1 . 68_{- 0.14}^{+ 0.13}$ $1.68_{-0.14}^{+0.13}$	$1 . 18_{- 0.03}^{+ 0.05}$ $1.18_{-0.03}^{+0.05}$
kT_e (keV)	$3 . 53_{- 0.07}^{+ 0.19}$ $3.53_{-0.07}^{+0.19}$	$2 . 91_{- 0.04}^{+ 0.05}$ $2.91_{-0.04}^{+0.05}$	$2 . 52_{- 0.05}^{+ 0.05}$ $2.52_{-0.05}^{+0.05}$
f	$0 . 70_{- 0.02}^{+ 0.05}$ $0.70_{-0.02}^{+0.05}$	$0 . 39_{- 0.04}^{+ 0.04}$ $0.39_{-0.04}^{+0.04}$	$0 . 04_{- 0.01}^{+ 0.01}$ $0.04_{-0.01}^{+0.01}$

bbodyrad
kT_bb (keV)	$1 . 15_{- 0.01}^{+ 0.02}$ $1.15_{-0.01}^{+0.02}$	$1 . 18_{- 0.03}^{+ 0.04}$ $1.18_{-0.03}^{+0.04}$	$1 . 25_{- 0.01}^{+ 0.01}$ $1.25_{-0.01}^{+0.01}$
R_bb (km)^a	$16 . 2_{- 0.7}^{+ 0.4}$ $16.2_{-0.7}^{+0.4}$	$18 . 9_{- 0.6}^{+ 0.4}$ $18.9_{-0.6}^{+0.4}$	$15 . 2_{- 0.2}^{+ 0.2}$ $15.2_{-0.2}^{+0.2}$

gaussian
LineE	$6 . 66_{- 0.03}^{+ 0.08}$ $6.66_{-0.03}^{+0.08}$	$6 . 86_{- 0.01}^{+ 0.02}$ $6.86_{-0.01}^{+0.02}$	$6 . 53_{- 0.02}^{+ 0.04}$ $6.53_{-0.02}^{+0.04}$
σ	$0 . 20_{- 0.05}^{+ 0.02}$ $0.20_{-0.05}^{+0.02}$	$0 . 18_{- 0.09}^{+ 0.08}$ $0.18_{-0.09}^{+0.08}$	$0 . 13_{- 0.08}^{+ 0.05}$ $0.13_{-0.08}^{+0.05}$
norm (10⁻³)	$5 . 81_{- 1.63}^{+ 0.61}$ $5.81_{-1.63}^{+0.61}$	$4 . 46_{- 1.34}^{+ 1.24}$ $4.46_{-1.34}^{+1.24}$	$3 . 28_{- 0.59}^{+ 0.58}$ $3.28_{-0.59}^{+0.58}$

2–8 keV flux ratios
F_dikbb/F_tot	22%	17%	12%
F_thcomp/F_tot	78%	83%	88%
2–8 keV photon flux ratios
F_diskbb/F_tot	29%	24%	16%
F_thcomp/F_tot	71%	76%	84%

χ²/d.o.f.	1216/1233	1201/1233	1331/1348

Notes. (a) Radia were determined for the distance of 7 kpc and inclination of 70 degrees.

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