Constraining the geometry of the dipping atoll 4U 1624–49 with X-ray spectroscopy and polarimetry

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Volume 690 (October 2024)

A&A, 690 (2024) A230

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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`	N_H (10²² cm⁻²)	10.6 $_{- 0.6}^{+ 0.4}$ $^{+0.4}_{-0.6}$	[10.6]
`edge`	E_c (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 N_Heq	22.9 $_{- 0.2}^{+ 0.3}$ $^{+0.3}_{-0.2}$	23.2 $_{- 0.1}^{+ 0.1}$ $^{+0.1}_{-0.1}$
`diskbb`	kT_in (keV)	[0.6]	[0.6]
	R_in (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]
	kT_e (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]
	R_bb (km)	13.3 $_{- 2.4}^{+ 2.2}$ $^{+2.2}_{-2.4}$	11.8 $_{- 0.7}^{+ 0.8}$ $^{+0.8}_{-0.7}$
`relxillNS`	q_em	[1.8]	[1.8]
	a	[0.1]	[0.1]
	i (deg)	62 $_{- 9}^{+ 12}$ $^{+12}_{-9}$	[62]
	R_in (ISCO)	[1.5]	[1.5]
	kT_bb (keV)	= kT	= kT
	log ξ	3.04 $_{- 0.08}^{+ 0.07}$ $^{+0.07}_{-0.08}$	[3.04]
	A_Fe	[1]	[1]
	log n_e	[16]	[16]
	N_r (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
F_Disk/F_Tot (2–8 keV) ^(a)		9.5%	9.3%
F_Comp/F_Tot (2–8 keV) ^(b)		68.6%	64.1%
F_Refl/F_Tot (2–8 keV) ^(c)		21.9%	26.6%
F_X (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 R_in and R_bb 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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