Probing accretion dynamics and spin evolution in the X-ray pulsar RX J0520.5–6932 during its 2024 outburst

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Table 3.

Best-fit spectral parameters of RX J0520.5–6932 using the model tbabs*tbvarabs*(blackbody + Gaussian + highecut*powerlaw*cyclabs).

Model	Parameters	Values
`tbvarabs`	$N_{H}^{LMC}$ $N_{\mathrm{H}}^{\mathrm{LMC}}$ (10²¹ cm⁻²)	$1 . 5_{- 1.0}^{+ 0.9}$ $1.5^{+0.9}_{-1.0}$
`Bbodyrad`	kT_BB (keV)	$0 . 092_{- 0.007}^{+ 0.010}$ $0.092_{-0.007}^{+0.010}$
	Norm (10⁴)	$5 . 0_{- 3.6}^{+ 8.0}$ $5.0_{-3.6}^{+8.0}$
	R_BB (km)	$1114_{- 400}^{+ 900}$ $1114_{-400}^{+900}$
`highecut`	E_cut (keV)	5.8 ± 0.5
	E_fold (keV)	$11 . 8_{- 0.7}^{+ 0.9}$ $11.8^{+0.9}_{-0.7}$
`powerlaw`	Γ	0.70 ± 0.04
	Norm (10⁻²)	$1 . 46_{- 0.07}^{+ 0.08}$ $1.46^{+0.08}_{-0.07}$
`Gaussian`	E (keV)	0.97 ± 0.02
	Norm (10⁻³)	1.0 ± 0.3
	EQW (eV)	67 ± 23
`Cyclabs`	E (keV)	$33 . 0_{- 1.4}^{+ 2.9}$ $33.0^{+2.9}_{-1.4}$
	width (keV)	$7 . 7_{- 3.1}^{+ 6.1}$ $7.7^{+6.1}_{-3.1}$
	Depth	$1 . 1_{- 0.2}^{+ 0.4}$ $1.1^{+0.4}_{-0.2}$
`Cons`	C_SXT	1.05 ± 0.02
	C_LAXPC	0.98 ± 0.02
	C_NICER	1 (fixed)
	Flux_{0.5 − 50 keV}^a	6.98 (14)×10⁻¹⁰
	Flux_{0.1 − 100 keV}^a	7.50 (17)×10⁻¹⁰
	L_{0.5 − 50 keV}^b	2.09 (4)×10³⁸
	L_{0.1 − 100 keV}^b	2.24 (5)×10³⁸

	χ²/d.o.f.	239/224

Notes. All errors and upper limits reported in this table are at a 90% confidence level (Δχ² = 2.7).

Unabsorbed flux in the units of erg cm⁻² s⁻¹.

X-ray Luminosity in the units of erg s⁻¹.

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