Confirmation of the presence of a CRSF in the NICER spectrum of X 1822-371

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Volume 683 (March 2024)

A&A, 683 (2024) A79

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Table 2.

Adopted models to fit the NICER spectrum.

Model	Components	χ²(d.o.f.)	Δχ²^(a)	Significance ^(b)	E^(c)	σ^(d)	Strength ^(e)
					(keV)	(keV)	( × 10⁻²)
A	`TBabs*(Comptb+gauss+gauss)`	453(144)	–	–	–	–	–
B	`TBabs*(bbodyrad+Comptb+gauss+gauss)`	258(142)	172.9	12	0.727 ± 0.015	0.11 ± 0.03
C	`TBfeo*(bbodyrad+Comptb+gauss+gauss)`	113(140)	27.7	3.1		0.10 ± 0.03
D	`TBabsedgeedge*(bbodyrad+Comptb+gauss+gauss)`	99(140)	15.1	0.1
E	`TBpcfTBabs(ga_OK+ga_Ne9+Comptb+gauss+gauss)`^(f)	116(138)	–	–	–	–	–
F	`TBpcfTBabs(ga_OK+ga_Ne9+Comptb+gauss+gauss)`^(g)	136(140)	48.2	5.3	0.74 ± 0.03	0.08 ± 0.04
G	`gabsTBabs(bbodyrad+Comptb+gauss+gauss)`	85(139)	–	–

Notes.

^(a)

Obtained adding to the model a gabs component at 0.7 keV.

^(b)

Statistical significance for the addition of the gabs component at 0.7 keV.

^(c,d,e)

Best-fit values of the energy, width and strength of the gabs component, errors are at 90% confidence level.

^(f)

The widths of the neutral O and Ne IX emission lines were left free to vary.

^(g)

The widths of the neutral O and Ne IX emission lines were kept fixed at 5 eV.

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