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 1.

Best-fit parameters for the broadband spectral model.


`constantTBabs(gaussian+nthComp+rdblurrfxconvnthComp)`
Component	Parameter	Value

TBABS	N_H (10²² cm⁻²)	$2 . 33_{- 0.05}^{+ 0.07}$ $2.33^{+0.07}_{-0.05}$

GAUSSIAN	E_Line (keV)	$1 . 61_{- 0.07}^{+ 0.04}$ $1.61^{+0.04}_{-0.07}$
	σ (keV)	$0 . 20_{- 0.05}^{+ 0.07}$ $0.20^{+0.07}_{-0.05}$
	Norm_Line	$0 . 004_{- 0.001}^{+ 0.002}$ $0.004^{+0.002}_{-0.001}$

NTHCOMP	Γ	$1 . 95_{- 0.03}^{+ 0.02}$ $1.95^{+0.02}_{-0.03}$
	kT_e (keV)	$16 . 5_{- 0.8}^{+ 0.9}$ $16.5^{+0.9}_{-0.8}$
	kT_seed (keV)	$0 . 670_{- 0.01}^{+ 0.02}$ $0.670^{+0.02}_{-0.01}$
	Norm_nthComp	$0 . 026_{- 0.004}^{+ 0.002}$ $0.026^{+0.002}_{-0.004}$
	F_1 − 79 (10⁻¹⁰ erg cm⁻² s⁻¹)	6.50 ± 0.02

REFLECTION MODEL	β	−4_{−6^( ⋆ )}⁺²
	R_in (R_g^†)	$21_{- 12}^{+ 17}$ $21^{+17}_{-12}$
	R_out (R_g^†)	1000^( * )
	Incl. (degrees)	≥59.8
	Refl. frac.	$- 0 . 6_{- 0.2}^{+ 0.1}$ $-0.6^{+0.1}_{-0.2}$
	Redshift	0^( * )
	Fe abund. (solar units)	1^( * )
	log ξ	$3 . 31_{- 0.08}^{+ 0.05}$ $3.31^{+0.05}_{-0.08}$
	F_1 − 79 (10⁻¹⁰ erg cm⁻² s⁻¹)	2.64 ± 0.02

TOTAL	F_1 − 79 (10⁻¹⁰ erg cm⁻² s⁻¹)	9.14 ± 0.02

	χ²/d.o.f.	1919.9/1858

Notes. ^( * )Kept frozen during the fit.

^(†)

^( ⋆ ) The parameter reached its hard limit set at –10. R_g = GM/c² is the gravitational radius.

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