Spectral evolution of RX J0440.9+4431 during the 2022–2023 giant outburst observed with Insight-HXMT

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Volume 689 (September 2024)

A&A, 689 (2024) A316

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Table 1.

Best-fitting spectral parameters of the Insight-HXMT observations of RX J0440.9+4431 using model 1 and model 2. Uncertainties are given at 90%.

ObsID		P0514361005(low state)		P0514361040(high state)

MJD		59948		59981

Components	Parameters	Model 1	Model 2	Model 1	Model 2
TBabs	N_H(×10²² cm⁻²)	0.6 (fixed)	0.6 (fixed)	0.6 (fixed)	0.6 (fixed)
gaussian	E_Fe(keV)	$6 . 32_{- 0.21}^{+ 0.22}$ $6.32^{+0.22}_{-0.21}$	$6 . 36_{- 0.21}^{+ 0.22}$ $6.36^{+0.22}_{-0.21}$	$6 . 45_{- 0.03}^{+ 0.03}$ $6.45^{+0.03}_{-0.03}$	$6 . 45_{- 0.03}^{+ 0.03}$ $6.45^{+0.03}_{-0.03}$
	σ(keV)	< 0.41	< 0.47	$0 . 37_{- 0.05}^{+ 0.05}$ $0.37^{+0.05}_{-0.05}$	$0 . 35_{- 0.05}^{+ 0.05}$ $0.35^{+0.05}_{-0.05}$
	N_gau(×10⁻²)	$0 . 2_{- 0.1}^{+ 0.1}$ $0.2^{+0.1}_{-0.1}$	$0 . 2_{- 0.1}^{+ 0.2}$ $0.2^{+0.2}_{-0.1}$	$1 . 8_{- 0.2}^{+ 0.2}$ $1.8^{+0.2}_{-0.2}$	$1 . 7_{- 0.2}^{+ 0.2}$ $1.7^{+0.2}_{-0.2}$
bbodyrad1	kT₁(keV)	$2 . 58_{- 0.07}^{+ 0.07}$ $2.58^{+0.07}_{-0.07}$	. . .	$0 . 37_{- 0.04}^{+ 0.04}$ $0.37^{+0.04}_{-0.04}$	. . .
	N_bb1	$3 . 7_{- 0.4}^{+ 0.4}$ $3.7^{+0.4}_{-0.4}$	. . .	$3225_{- 1400}^{+ 3283}$ $3225^{+3283}_{-1400}$	. . .
bbodyrad2	kT₂(keV)	. . .	. . .	$5 . 67_{- 0.15}^{+ 0.13}$ $5.67^{+0.13}_{-0.15}$	. . .
	N_bb2	. . .	. . .	$0 . 39_{- 0.05}^{+ 0.05}$ $0.39^{+0.05}_{-0.05}$	. . .
cutoffpl	Γ	$0 . 75_{- 0.02}^{+ 0.02}$ $0.75^{+0.02}_{-0.02}$	. . .	$0 . 62_{- 0.02}^{+ 0.02}$ $0.62^{+0.02}_{-0.02}$	. . .
	E_cut(keV)	$25 . 89_{- 0.63}^{+ 0.65}$ $25.89^{+0.65}_{-0.63}$	. . .	$19 . 92_{- 0.31}^{+ 0.32}$ $19.92^{+0.32}_{-0.31}$	. . .
	N_cut	$0 . 16_{- 0.01}^{+ 0.01}$ $0.16^{+0.01}_{-0.01}$	. . .	$0 . 56_{- 0.02}^{+ 0.02}$ $0.56^{+0.02}_{-0.02}$	. . .
comptt1	T₀₁(keV)	. . .	$0 . 72_{- 0.09}^{+ 0.07}$ $0.72^{+0.07}_{-0.09}$	. . .	$0 . 30_{- 0.11}^{+ 0.05}$ $0.30^{+0.05}_{-0.11}$
	kT₁(keV)	. . .	$6 . 59_{- 0.68}^{+ 1.03}$ $6.59^{+1.03}_{-0.68}$	. . .	$6 . 19_{- 0.11}^{+ 0.10}$ $6.19^{+0.10}_{-0.11}$
	τ₁	. . .	$9 . 97_{- 1.25}^{+ 1.23}$ $9.97^{+1.23}_{-1.25}$	. . .	$14 . 35_{- 0.16}^{+ 0.15}$ $14.35^{+0.15}_{-0.16}$
	N_comp1	. . .	$0 . 070_{- 0.004}^{+ 0.008}$ $0.070^{+0.008}_{-0.004}$	. . .	$0 . 452_{- 0.025}^{+ 0.090}$ $0.452^{+0.090}_{-0.025}$
comptt2	T₀₂(keV)	. . .	$1 . 86_{- 0.20}^{+ 0.20}$ $1.86^{+0.20}_{-0.20}$	. . .	$1 . 73_{- 0.05}^{+ 0.05}$ $1.73^{+0.05}_{-0.05}$
	kT₂(keV)	. . .	$16 . 22_{- 0.74}^{+ 1.03}$ $16.22^{+1.03}_{-0.74}$	. . .	$12 . 91_{- 0.22}^{+ 0.23}$ $12.91^{+0.23}_{-0.22}$
	τ₂	. . .	$5 . 97_{- 0.44}^{+ 0.39}$ $5.97^{+0.39}_{-0.44}$	. . .	$8 . 94_{- 0.30}^{+ 0.30}$ $8.94^{+0.30}_{-0.30}$
	N_comp2	. . .	$0 . 029_{- 0.003}^{+ 0.003}$ $0.029^{+0.003}_{-0.003}$	. . .	$0 . 087_{- 0.003}^{+ 0.003}$ $0.087^{+0.003}_{-0.003}$

	χ²/d.o.f.	348/286	279/283	342/284	317/283

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