Probing the emission mechanism and nature of the pulsating compact object in the X-ray binary SAX J1324.4−6200

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Volume 685 (May 2024)

A&A, 685 (2024) A148

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Table 4.

Best-fit spectral parameters from the simultaneous fit of the Swift/XRT and NuSTAR (XRT+NuSTAR) and XMM-Newton data sets with an absorbed power law with a high energy cutoff, and constant renormalization factors.

Parameters	XRT+NuSTAR	XMM-Newton
N_H (10²²) cm⁻²	$8 . 1_{- 1.0}^{+ 1.2}$ $8.1^{+1.2}_{-1.0}$	$11 . 1_{- 0.3}^{+ 0.3}$ $11.1^{+0.3}_{-0.3}$
Γ	$1 . 06_{- 0.04}^{+ 0.04}$ $1.06^{+0.04}_{-0.04}$	$1 . 22_{- 0.04}^{+ 0.04}$ $1.22^{+0.04}_{-0.04}$
norm_po	$7 . 2_{- 0.6}^{+ 0.8} \times 10^{- 4}$ $7.2^{+0.8}_{-0.6}\times 10^{-4}$	$8 . 2_{- 0.6}^{+ 0.7} \times 10^{- 4}$ $8.2^{+0.7}_{-0.6}\times 10^{-4}$
E_c (keV)	$11 . 5_{- 0.2}^{+ 0.2}$ $11.5^{+0.2}_{-0.2}$	11.5 (frozen)
E_f (keV)	$9 . 0_{- 0.4}^{+ 0.4}$ $9.0^{+0.4}_{-0.4}$	9.0 (frozen)
const_{NuSTAR B}	$1 . 004_{- 0.014}^{+ 0.014}$ $1.004^{+0.014}_{-0.014}$
const_XRT	$0 . 90_{- 0.09}^{+ 0.09}$ $0.90^{+0.09}_{-0.09}$
const_pn
const_mos1		$1 . 04_{- 0.02}^{+ 0.02}$ $1.04^{+0.02}_{-0.02}$
const_mos2		$1 . 01_{- 0.02}^{+ 0.02}$ $1.01^{+0.02}_{-0.02}$
χ² (d.o.f.)	196.08 (162)	258.790 (226)
Null hypothesis prob.	0.035	0.066
F_x ^(a)	$5 . 40_{- 0.06}^{+ 0.06}$ $5.40^{+0.06}_{-0.06}$	$4 . 31_{- 0.06}^{+ 0.06}$ $4.31^{+0.06}_{-0.06}$

Notes. Errors are at a 1σ confidence level. Model: const*tbabs*po*highecut.

^(a)

The absorbed X-ray flux (in units of 10⁻¹² erg cm⁻² s⁻¹) was calculated (using cflux in XSPEC) in the range 4 − 10 keV.

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