A highly ionised outflow in the X-ray binary 4U 1624–49 detected with XRISM

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Volume 708 (April 2026)

A&A, 708 (2026) A130

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Table 2.

Spectral fits of Fe XXV, Fe XXVI, Ni XXVII, and Ni XXVIII species for p0–p4 intervals with the slab component (see text).

Interval	p0	p1	p2	p3	p4
Parameter
log (N_Fe XXV cm⁻¹)	17.63 ± 0.07	17.15 $_{- 0.27}^{+ 0.20}$ $Mathematical equation: $ ^{+0.20}_{-0.27} $$	17.34 $_{- 0.15}^{+ 0.11}$ $Mathematical equation: $ ^{+0.11}_{-0.15} $$	17.43 $_{- 0.12}^{+ 0.10}$ $Mathematical equation: $ ^{+0.10}_{-0.12} $$	17.74 ± 0.07
log (N_Fe XXVI cm⁻²)	18.15 ± 0.06	17.93 ± 0.14	17.98 ± 0.09	17.99 ± 0.09	18.18 ± 0.06
log (N_Ni XXVII, cm⁻²)	16.70 $_{- 0.14}^{+ 0.11}$ $Mathematical equation: $ ^{+0.11}_{-0.14} $$	–	–	16.32 $_{- 0.46}^{+ 0.23}$ $Mathematical equation: $ ^{+0.23}_{-0.46} $$	16.93 $_{- 0.10}^{+ 0.08}$ $Mathematical equation: $ ^{+0.08}_{-0.10} $$
log (N_Ni XXVIII cm⁻²)	16.86 $_{- 0.23}^{+ 0.15}$ $Mathematical equation: $ ^{+0.15}_{-0.23} $$	16.6 $_{- 0.6}^{+ 0.3}$ $Mathematical equation: $ ^{+0.3}_{-0.6} $$	17.02 $_{- 0.19}^{+ 0.14}$ $Mathematical equation: $ ^{+0.14}_{-0.19} $$	16.87 $_{- 0.26}^{+ 0.17}$ $Mathematical equation: $ ^{+0.17}_{-0.26} $$	17.02 $_{- 0.17}^{+ 0.13}$ $Mathematical equation: $ ^{+0.13}_{-0.17} $$
σ_v (km s⁻¹)	130 ± 25	45 $_{- 44}^{+ 30}$ $Mathematical equation: $ ^{+30}_{-44} $$	116 ± 36	104 $_{- 26}^{+ 29}$ $Mathematical equation: $ ^{+29}_{-26} $$	120 ± 26
v (km s⁻¹)	−150 ± 19	−405 ± 28	−456 ± 30	−377 ± 27	−194 ± 17

Notes. For each interval, we only fitted the XRISM Resolve spectra in the 7.5−9 keV energy range.

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