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Table 2.

Best-fit spectral parameters for the Eastern model obtained for 4U 1624–49 with IXPE+NuSTAR+NICER spectra.

Eastern model Parameter Nondip Dip
TBabs NH (1022 cm−2) 10.6 0.6 + 0.4 $ ^{+0.4}_{-0.6} $ [10.6]
edge Ec (keV) [1.839] [1.839]
D 0.34 0.08 + 0.07 $ ^{+0.07}_{-0.08} $ 0.24 0.17 + 0.16 $ ^{+0.16}_{-0.17} $
CLOUDY log ξ 4.7 0.4 + 0.2 $ ^{+0.2}_{-0.4} $ 4.2 0.1 + 0.1 $ ^{+0.1}_{-0.1} $
log NHeq 22.9 0.2 + 0.3 $ ^{+0.3}_{-0.2} $ 23.2 0.1 + 0.1 $ ^{+0.1}_{-0.1} $
diskbb kTin (keV) [0.6] [0.6]
Rin (km) 20.6 3.5 + 2.9 $ ^{+2.9}_{-3.5} $ 18.6 1.8 + 1.8 $ ^{+1.8}_{-1.8} $
thcomp τ 6.9 0.8 + 0.8 $ ^{+0.8}_{-0.8} $ [6.9]
kTe (keV) 3.2 0.2 + 0.2 $ ^{+0.2}_{-0.2} $ [3.2]
bbodyrad kT (keV) 1.14 0.02 + 0.02 $ ^{+0.02}_{-0.02} $ [1.14]
Rbb (km) 13.3 2.4 + 2.2 $ ^{+2.2}_{-2.4} $ 11.8 0.7 + 0.8 $ ^{+0.8}_{-0.7} $
relxillNS qem [1.8] [1.8]
a [0.1] [0.1]
i (deg) 62 9 + 12 $ ^{+12}_{-9} $ [62]
Rin (ISCO) [1.5] [1.5]
kTbb (keV) = kT = kT
log ξ 3.04 0.08 + 0.07 $ ^{+0.07}_{-0.08} $ [3.04]
AFe [1] [1]
log ne [16] [16]
Nr (10−4) 10.6 2.9 + 6.6 $ ^{+6.6}_{-2.9} $ 10.7 0.4 + 0.4 $ ^{+0.4}_{-0.4} $

χ2/d.o.f. 715.6/675 675.8/646
FDisk/FTot (2–8 keV) (a) 9.5% 9.3%
FComp/FTot (2–8 keV) (b) 68.6% 64.1%
FRefl/FTot (2–8 keV) (c) 21.9% 26.6%
FX (10−9 erg s−1 cm−2) (d) 1.45 1.17

Notes. The errors are at the 90% confidence level for a single parameter. Parameters in square brackets were frozen during the fit. A 15 kpc distance is assumed to compute the inner radius Rin and Rbb from diskbb and bbodyrad normalizations.

(a)

Percentage of disk photon flux in the 2–8 keV range.

(b)

Percentage of Comptonized photon flux in the 2–8 keV range.

(c)

Percentage of reflected photon flux in the 2–8 keV range.

(d)

Model flux in the energy range 0.1–20 keV.

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