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

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Table 1.

Best-fit spectral parameters of the NICER/NuSTAR/INTEGRAL data for IGR J17498−2921 for the model constant×tbabs×(gaussian+relxillCp).

Parameter (units)	Best-fit values
N_H (10²² cm⁻²)	3.15 ± 0.03
E_line (keV)	1.71 ± 0.02
σ (keV)	0.054 ± 0.026
Norm(×10⁻³)	0.97_−0.25^+0.30
i (deg)	$34_{- 3}^{+ 2}$ $34_{-3}^{+2}$
R_in(R_ISCO)	$1 . 7_{- 0.3}^{+ 0.4}$ $1.7_{-0.3}^{+ 0.4}$
Γ	1.78 ± 0.01
log(ξ/erg cm s⁻¹)	$4 . 46_{- 0.07}^{+ 0.14}$ $4.46_{-0.07}^{+0.14}$
log(n_e/cm⁻³)	19.5_−0.5^+0.3
A_Fe	7.7_−0.9^+1.6
kT_e (keV)	39 ± 4
f_refl.	5.2_−0.7^+1.0
Norm_refl. (×10⁻⁴)	2.8 ± 0.4
C_NuSTAR/FPMA	1 (fixed)
C_NuSTAR/FPMB	1.01 ± 0.01
C_NICER	0.97 ± 0.01
C_{INTEGRAL/ISGRI}	1.19 ± 0.03

χ²/d.o.f.	625.49/560
F_bol (10⁻⁹ erg s⁻¹ cm⁻²) ^(a)	1.45 ± 0.01

Notes. The multiplication factor for all instruments is provided.

^(a)

Unabsorbed flux in the 1–250 keV energy range.

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