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 B.2.

Best-fitting model continuum for each NICER observation of IGR J17498−2921.

ObsID	Γ	kT_seed	Norm_nthComp	Unabs. 1-10 keV flux	χ²/d.o.f.
		(keV)		(10⁻¹⁰ erg s⁻¹ cm⁻²)
6203770101	$1 . 79_{- 0.03}^{+ 0.04}$ $1.79^{+0.04}_{-0.03}$	0.31 ± 0.01	0.134 ± 0.004	9.79 ± 0.02	110.9/119
6203770102	$1 . 87_{- 0.04}^{+ 0.05}$ $1.87^{+0.05}_{-0.04}$	0.35 ± 0.01	0.130 ± 0.004	10.07 ± 0.02	97.1/120
6560010101	1.76 ± 0.03	0.32 ± 0.01	0.131 ± 0.003	10.34 ± 0.02	125.6/121
6560010102	1.80 ± 0.03	0.29 ± 0.02	0.120 ± 0.004	8.37 ± 0.02	123.9/116
6560010103	$1 . 72_{- 0.02}^{+ 0.03}$ $1.72^{+0.03}_{-0.02}$	0.28 ± 0.02	$0 . 103_{- 0.004}^{+ 0.003}$ $0.103^{+0.003}_{-0.004}$	7.60 ± 0.02	149.6/116
6560010105	$1 . 82_{- 0.02}^{+ 0.03}$ $1.82^{+0.03}_{-0.02}$	0.31 ± 0.01	$0 . 112_{- 0.003}^{+ 0.002}$ $0.112^{+0.002}_{-0.003}$	8.10 ± 0.01	108.4/126
6560010106	$1 . 87_{- 0.02}^{+ 0.03}$ $1.87^{+0.03}_{-0.02}$	0.36 ± 0.01	0.127 ± 0.003	10.12 ± 0.02	109.4/121
6203770105	$1 . 88_{- 0.05}^{+ 0.06}$ $1.88^{+0.06}_{-0.05}$	0.33 ± 0.02	$0 . 120_{- 0.007}^{+ 0.006}$ $0.120^{+0.006}_{-0.007}$	8.78 ± 0.03	130.4/107
6560010107	$1 . 83_{- 0.03}^{+ 0.04}$ $1.83^{+0.04}_{-0.03}$	$0 . 31_{- 0.01}^{+ 0.02}$ $0.31^{+0.02}_{-0.01}$	0.105 ± 0.003	7.45 ± 0.02	96.2/116
6560010109	1.70 ± 0.01	0.30 ± 0.01	0.069 ± 0.002	5.31 ± 0.01	206.3/120
6560010110	1.72 ± 0.02	$0 . 29_{- 0.02}^{+ 0.01}$ $0.29^{+0.01}_{-0.02}$	0.064 ± 0.002	4.80 ± 0.01	190.8/118
6560010111	1.77 ± 0.02	0.30 ± 0.01	0.066 ± 0.002	4.69 ± 0.01	159.3/119
6560010112	$1 . 91_{- 0.04}^{+ 0.06}$ $1.91^{+0.06}_{-0.04}$	0.32 ± 0.02	0.078 ± 0.004	5.38 ± 0.02	101.8/108
6560010113	1.83 ± 0.03	0.30 ± 0.03	$0 . 065_{- 0.005}^{+ 0.004}$ $0.065^{+0.004}_{-0.005}$	4.41 ± 0.02	110.4/107

Notes. The associated errors are reported at a 90 percent confidence level. The absorption column density and the electron temperature were kept frozen at N_H = 2.87 × 10²² cm⁻² and kT_e = 20 keV during the fits.

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