Spectral properties of the neutron star low-mass X-ray binaries 4U 1636–53, XTE J1739–285, and MAXI J1816–195

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Table 4.

Best-fitting results for the fits to the X-ray spectra of XTE J1739–285 with the reflection model M1–M4.

Model Comp	Parameter	M1	M2	M3	M4
TBABS	N_H (10²² cm⁻²)	$2 . 81_{- 0.20}^{+ 0.19}$ $2.81_{-0.20}^{+0.19}$	$3 . 23_{- 0.19}^{+ 0.13}$ $3.23_{-0.19}^{+0.13}$	$3 . 06_{- 0.44}^{+ 0.16}$ $3.06_{-0.44}^{+0.16}$	$3 . 15_{- 0.15}^{+ 0.14}$ $3.15_{-0.15}^{+0.14}$
BBODYRAD	kT_BB (keV)	$0 . 88_{- 0.07}^{+ 0.10}$ $0.88_{-0.07}^{+0.10}$	$1 . 32_{- 0.04}^{+ 0.05}$ $1.32_{-0.04}^{+0.05}$	$1 . 48_{- 0.18}^{+ 0.27}$ $1.48_{-0.18}^{+0.27}$	$1 . 30_{- 0.04}^{+ 0.09}$ $1.30_{-0.04}^{+0.09}$
	Norm	$31 . 3_{- 12.8}^{+ 14.4}$ $31.3_{-12.8}^{+14.4}$	$1 . 5_{- 0.1}^{+ 0.3}$ $1.5_{-0.1}^{+0.3}$	$4 . 5_{- 3.0}^{+ 1.8}$ $4.5_{-3.0}^{+1.8}$	1.7 ± 0.3
	Flux (10⁻¹⁰ c.g.s)	2.0 ± 0.2	0.5 ± 0.1	$2 . 3_{- 0.3}^{+ 0.2}$ $2.3_{-0.3}^{+0.2}$	0.5 ± 0.1
DISKBB	kT_disk (keV)	$0 . 14_{- 0.02}^{+ 0.01}$ $0.14_{-0.02}^{+0.01}$	0.14 ± 0.01	$0 . 15_{- 0.01}^{+ 0.03}$ $0.15_{-0.01}^{+0.03}$	0.15 ± 0.01
	Norm	$118462_{- 68334}^{+ 186391}$ $118462_{-68334}^{+186391}$	$383888_{- 153209}^{+ 276573}$ $383888_{-153209}^{+276573}$	$198676_{- 120239}^{+ 227325}$ $198676_{-120239}^{+227325}$	$229750_{- 109815}^{+ 191185}$ $229750_{-109815}^{+191185}$
	Flux (10⁻¹⁰ c.g.s)	$9 . 0_{- 4.1}^{+ 5.8}$ $9.0_{-4.1}^{+5.8}$	$26 . 5_{- 7.3}^{+ 12.2}$ $26.5_{-7.3}^{+12.2}$	$15 . 8_{- 12.0}^{+ 10.6}$ $15.8_{-12.0}^{+10.6}$	$19 . 7_{- 7.7}^{+ 14.0}$ $19.7_{-7.7}^{+14.0}$
THCOMP	Γ	$1 . 78_{- 0.01}^{+ 0.02}$ $1.78_{-0.01}^{+0.02}$	$1 . 73_{- 0.01}^{+ 0.03}$ $1.73_{-0.01}^{+0.03}$	$1 . 65_{- 0.02}^{+ 0.04}$ $1.65_{-0.02}^{+0.04}$	$1 . 68_{- 0.04}^{+ 0.03}$ $1.68_{-0.04}^{+0.03}$
	kT_e (keV)	$40 . 1_{- 11.5}^{+ 7.4}$ $40.1_{-11.5}^{+7.4}$	$18 . 1_{- 1.2}^{+ 1.8}$ $18.1_{-1.2}^{+1.8}$	$19 . 8_{- 2.6}^{+ 3.2}$ $19.8_{-2.6}^{+3.2}$	$21 . 3_{- 2.4}^{+ 4.3}$ $21.3_{-2.4}^{+4.3}$
	f_cov	$1 . 00_{- 0.09}^{+ 0 }$ $1.00_{-0.09}^{+0}$	$0 . 03_{- 0.01}^{+ 0.02}$ $0.03_{-0.01}^{+0.02}$	$0 . 79_{- 0.19}^{+ 0.07}$ $0.79_{-0.19}^{+0.07}$	0.03 ± 0.01
RELXILLCP	Incl	$29 . 0_{- 24.0 }^{+ 11.2}$ $29.0_{-24.0}^{+11.2}$	$5 . 0_{- 0 }^{+ 31.1}$ $5.0_{-0}^{+31.1}$	–	–
	R_in (R_g)	$19 . 9_{- 10.8}^{+ 25.6}$ $19.9_{-10.8}^{+25.6}$	$18 . 0_{- 12.6 }^{+ 10.8}$ $18.0_{-12.6}^{+10.8}$	–	–
	log(ξ)	$3 . 44_{- 0.19}^{+ 0.18}$ $3.44_{-0.19}^{+0.18}$	$3 . 18_{- 0.28}^{+ 0.32}$ $3.18_{-0.28}^{+0.32}$	–	–
	Norm (10⁻⁴)	$3 . 65_{- 0.94}^{+ 1.24}$ $3.65_{-0.94}^{+1.24}$	$1 . 14_{- 0.30}^{+ 0.53}$ $1.14_{-0.30}^{+0.53}$	–	–
	Flux (10⁻¹⁰ c.g.s)	$4 . 1_{- 0.9}^{+ 1.0}$ $4.1_{-0.9}^{+1.0}$	$1 . 4_{- 0.4}^{+ 1.2}$ $1.4_{-0.4}^{+1.2}$	–	–
RELXILLLPCP	Incl	–	–	$5 . 0_{- 0 }^{+ 31.3}$ $5.0_{-0}^{+31.3}$	$14 . 0_{- 9.0 }^{+ 29.5}$ $14.0_{-9.0}^{+29.5}$
	R_in (R_g)	–	–	$17 . 7_{- 5.1}^{+ 29.2}$ $17.7_{-5.1}^{+29.2}$	$22 . 4_{- 9.6}^{+ 35.4}$ $22.4_{-9.6}^{+35.4}$
	h (R_g)	–	–	$2 . 20_{- 0 }^{+ 0.20}$ $2.20_{-0}^{+0.20}$	$2 . 54_{- 0.17}^{+ 0.69}$ $2.54_{-0.17}^{+0.69}$
	log(ξ)	–	–	$3 . 57_{- 0.11}^{+ 0.10}$ $3.57_{-0.11}^{+0.10}$	$3 . 56_{- 0.89}^{+ 0.13}$ $3.56_{-0.89}^{+0.13}$
	Norm (10⁻²)	–	–	$3 . 46_{- 1.13}^{+ 0.66}$ $3.46_{-1.13}^{+0.66}$	$0 . 39_{- 0.37}^{+ 0.68}$ $0.39_{-0.37}^{+0.68}$
	Flux (10⁻¹⁰ c.g.s)	–	–	4.3 ± 0.4	$2 . 3_{- 1.3}^{+ 0.4}$ $2.3_{-1.3}^{+0.4}$
	$χ_{ν}^{2}$ $\chi_{\nu}^{2}$ (χ²/d.o.f.)	1.02(1641.5/1615)	1.02(1652.7/1615)	1.02(1642.0/1614)	1.02(1649.1/1614)
	Total Flux (10⁻¹⁰ c.g.s)	$19 . 6_{- 4.2}^{+ 2.8}$ $19.6_{-4.2}^{+2.8}$	$36 . 8_{- 7.5}^{+ 11.8}$ $36.8_{-7.5}^{+11.8}$	$26 . 1_{- 9.9}^{+ 11.1}$ $26.1_{-9.9}^{+11.1}$	$29 . 9_{- 7.4}^{+ 13.2}$ $29.9_{-7.4}^{+13.2}$

Notes. We list the unabsorbed flux (erg cm⁻² s⁻¹) in the energy range 0.1–100 keV. The asterisk indicates that the error peaked at the hard limit of the parameter range.

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