Spectral and timing properties of the accreting millisecond X-ray pulsar IGR J17498−2921 during its 2023 outburst

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Volume 691 (November 2024)

A&A, 691 (2024) A189

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Table A.1.

Best-fit parameters for the broadband spectral model defined as constant*TBabs*(gaussian+nthComp+relxillCp).

Component	Parameter	Value
TBABS	N_H (10²² cm⁻²)	3.0 ± 0.1

GAUSSIAN	E_Line (keV)	1.66 ± 0.05
	σ (keV)	$0 . 10_{- 0.04}^{+ 0.05}$ $0.10^{+0.05}_{-0.04}$
	Norm_Line	$0 . 0015_{- 0.0006}^{+ 0.0009}$ $0.0015^{+0.0009}_{-0.0006}$

NTHCOMP	Γ	2.00 ± 0.01
	kT_e (keV)	$21_{- 1}^{+ 2}$ $21^{+2}_{-1}$
	kT_seed (keV)	$0 . 75_{- 0.03}^{+ 0.04}$ $0.75^{+0.04}_{-0.03}$
	Norm_nthComp	0.020 ± 0.003
	F_3 − 79 (10⁻¹⁰ erg cm⁻² s⁻¹)	$4 . 57_{- 0.05}^{+ 0.03}$ $4.57^{+0.03}_{-0.05}$

REFLECTION MODEL	β	$- 3_{- 1}^{+ 6}$ $-3^{+6}_{-1}$
	R_in (R_g)	$20_{- 10}^{+ 18}$ $20^{+18}_{-10}$
	R_out (R_g)	1000^( * )
	Incl. (degrees)	$72_{- 19}^{+ 10}$ $72^{+10}_{-19}$
	Refl. frac.	−8_{−2^( ⋆ )}⁺³
	Redshift	0^( * )
	Fe abund. (solar units)	1^( * )
	log ξ	$3 . 3_{- 0.1}^{+ 0.2}$ $3.3^{+0.2}_{-0.1}$
	logN (cm⁻³)	$18 . 5_{- 0.9}^{+ 0.4}$ $18.5^{+0.4}_{-0.9}$
	F_3 − 79 (10⁻¹⁰ erg cm⁻² s⁻¹)	2.59 ± 0.04

TOTAL	F_1 − 79 (10⁻¹⁰ erg cm⁻² s⁻¹)	10.09 ± 0.02
	F_3 − 79 (10⁻¹⁰ erg cm⁻² s⁻¹)	7.03 ± 0.02

	χ²/d.o.f.	1902.4/1857

Kept frozen during the fit.

The parameter reached its hard limit set at -10.

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