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.3.

Best-fitting parameters for the emission lines detected in each NICER spectrum of IGR J17498−2921.

ObsID	Si Line			Fe Line
	E_Line, 1	σ_Line, 1	Norm_Line, 1	E_Line, 2	σ_Line, 2	Norm_Line, 2
	(keV)	(keV)		(keV)	(keV)
6203770101	$1 . 69_{- 0.04}^{+ 0.03}$ $1.69^{+0.03}_{-0.04}$	$0 . 08_{- 0.03}^{+ 0.04}$ $0.08^{+0.04}_{-0.03}$	0.0014 ± 0.0005	6.40^( * )	$1 . 2_{- 0.5}^{+ 0.7}$ $1.2^{+0.7}_{-0.5}$	$0 . 001_{- 0.001}^{+ 0.002}$ $0.001^{+0.002}_{-0.001}$
6203770102	1.64 ± 0.04	$0 . 12_{- 0.03}^{+ 0.04}$ $0.12^{+0.04}_{-0.03}$	$0 . 0022_{- 0.0006}^{+ 0.0008}$ $0.0022^{+0.0008}_{-0.0006}$	6.40^( ⋆ ) − 6.51	$1 . 3_{- 0.3}^{+ 0.4}$ $1.3^{+0.4}_{-0.3}$	$0 . 003_{- 0.001}^{+ 0.002}$ $0.003^{+0.002}_{-0.001}$
6560010101	1.69 ± 0.03	0.07 ± 0.03	0.0012 ± 0.004	6.40^( ⋆ ) − 6.47	1.3 ± 0.3	0.002 ± 0.001
6560010102	1.69 ± 0.04	$0 . 07_{- 0.03}^{+ 0.04}$ $0.07^{+0.04}_{-0.03}$	0.0010 ± 0.0004	6.40^( ⋆ ) − 6.54	1.3 ± 0.5	0.001 ± 0.001
6560010103	$1 . 68_{- 0.07}^{+ 0.05}$ $1.68^{+0.05}_{-0.07}$	0.07 ± 0.05	$0 . 0008_{- 0.0004}^{+ 0.0005}$ $0.0008^{+0.0005}_{-0.0004}$	6.40^( ⋆ ) − 6.52	$1 . 0_{- 0.4}^{+ 0.6}$ $1.0^{+0.6}_{-0.4}$	$0 . 0006_{- 0.0004}^{+ 0.0008}$ $0.0006^{+0.0008}_{-0.0004}$
6560010105	1.68 ± 0.03	$0 . 08_{- 0.02}^{+ 0.03}$ $0.08^{+0.03}_{-0.02}$	$0 . 0014_{- 0.0003}^{+ 0.0004}$ $0.0014^{+0.0004}_{-0.0003}$	6.40^( ⋆ ) − 6.48	1.1 ± 0.3	$0 . 0015_{- 0.0006}^{+ 0.0009}$ $0.0015^{+0.0009}_{-0.0006}$
6560010106	1.70 ± 0.03	0.07 ± 0.03	$0 . 0014_{- 0.0004}^{+ 0.0005}$ $0.0014^{+0.0005}_{-0.0004}$	6.40^( ⋆ ) − 6.54	0.9 ± 0.3	$0 . 0016_{- 0.0006}^{+ 0.0009}$ $0.0016^{+0.0009}_{-0.0006}$
6203770105	$1 . 65_{- 0.06}^{+ 0.05}$ $1.65^{+0.05}_{-0.06}$	$0 . 09_{- 0.04}^{+ 0.06}$ $0.09^{+0.06}_{-0.04}$	0.002 ± 0.001	6.40^( ⋆ ) − 6.56	1.0 ± 0.5	$0 . 002_{- 0.001}^{+ 0.002}$ $0.002^{+0.002}_{-0.001}$
6560010107	1.70 ± 0.04	$0 . 08_{- 0.03}^{+ 0.04}$ $0.08^{+0.04}_{-0.03}$	$0 . 0010_{- 0.0003}^{+ 0.0004}$ $0.0010^{+0.0004}_{-0.0003}$	6.40^( ⋆ ) − 6.62	$1 . 1_{- 0.5}^{+ 0.6}$ $1.1^{+0.6}_{-0.5}$	0.001 ± 0.001
6560010109	$1 . 7_{- 0.2}^{+ 0.1}$ $1.7^{+0.1}_{-0.2}$	0^( * )	0.0001 ± 0.0001	-	-	-
6560010110	$1 . 78_{- 0.04}^{+ 0.03}$ $1.78^{+0.03}_{-0.04}$	0^( * )	0.0002 ± 0.0001	$6 . 6_{- 0.2}^{+ 0.1}$ $6.6^{+0.1}_{-0.2}$	0^( * )	0.00006 ± 0.00005
6560010111	1.70 ± 0.03	0.05 ± 0.04	0.0005 ± 0.0002	-	-	-
6560010112	$1 . 68_{- 0.05}^{+ 0.04}$ $1.68^{+0.04}_{-0.05}$	$0 . 10_{- 0.04}^{+ 0.05}$ $0.10^{+0.05}_{-0.04}$	$0 . 0013_{- 0.0005}^{+ 0.0006}$ $0.0013^{+0.0006}_{-0.0005}$	6.40^( ⋆ ) − 6.63	$1 . 0_{- 0.4}^{+ 0.6}$ $1.0^{+0.6}_{-0.4}$	0.001 ± 0.001
6560010113	$1 . 64_{- 0.07}^{+ 0.05}$ $1.64^{+0.05}_{-0.07}$	$0 . 10_{- 0.05}^{+ 0.07}$ $0.10^{+0.07}_{-0.05}$	$0 . 0011_{- 0.0005}^{+ 0.0008}$ $0.0011^{+0.0008}_{-0.0005}$	-	-	-

Notes. The ∼1.7 keV line is most likely a Si fluorescence line from the Focal Plane Modules, while the second Gaussian line was included to account for any residual features in the energy range where the iron line is expected, namely ∼6.40-6.97 keV. The associated errors are reported at a 90 percent confidence level. Kept frozen during the fit. A line width fixed at 0 keV signifies a delta function convolved with the instrument’s spectral resolution (∼137 eV at 6 keV for NICER/XTI), indicating that the line is narrower than this value.

The parameter reached its hard limit set at 6.4 keV.

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