Study of millihertz quasiperiodic oscillations in the 2023 outburst of 4U 0115+63 using NuSTAR

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Table 2.

Best-fitting spectral parameters of the NuSTAR observations of 4U 0115+63.

ObsID		90902316002			90902316004

MJD		60043			60060

Components	Parameters	P1	P2	P3	P1	P2	P3	P4	P5
TBabs	N_H (×10²² cm⁻²)	1.3 (fixed)
gabs2	E (keV)	$21 . 66_{- 0.55}^{+ 0.58}$ $21.66^{+0.58}_{-0.55}$	$21 . 13_{- 0.50}^{+ 0.52}$ $21.13^{+0.52}_{-0.50}$	$22 . 19_{- 0.43}^{+ 0.44}$ $22.19^{+0.44}_{-0.43}$	$22 . 46_{- 1.02}^{+ 1.16}$ $22.46^{+1.16}_{-1.02}$	$23 . 28_{- 1.19}^{+ 1.50}$ $23.28^{+1.50}_{-1.19}$	$20 . 54_{- 0.78}^{+ 1.06}$ $20.54^{+1.06}_{-0.78}$	$21 . 99_{- 1.11}^{+ 1.76}$ $21.99^{+1.76}_{-1.11}$	$22 . 18_{- 0.98}^{+ 1.16}$ $22.18^{+1.16}_{-0.98}$
	σ (keV)	$8 . 37_{- 1.18}^{+ 1.17}$ $8.37^{+1.17}_{-1.18}$	$6 . 83_{- 0.77}^{+ 0.88}$ $6.83^{+0.88}_{-0.77}$	$6 . 21_{- 0.83}^{+ 1.13}$ $6.21^{+1.13}_{-0.83}$	$5 . 43_{- 0.88}^{+ 0.86}$ $5.43^{+0.86}_{-0.88}$	$6 . 14_{- 0.99}^{+ 1.14}$ $6.14^{+1.14}_{-0.99}$	$4 . 68_{- 0.66}^{+ 0.63}$ $4.68^{+0.63}_{-0.66}$	$5 . 16_{- 1.01}^{+ 0.99}$ $5.16^{+0.99}_{-1.01}$	$5 . 33_{- 0.83}^{+ 0.90}$ $5.33^{+0.90}_{-0.83}$
	Depth (keV)	$21 . 97_{- 5.53}^{+ 7.23}$ $21.97^{+7.23}_{-5.53}$	$14 . 13_{- 2.67}^{+ 3.77}$ $14.13^{+3.77}_{-2.67}$	$11 . 61_{- 2.17}^{+ 3.65}$ $11.61^{+3.65}_{-2.17}$	$13 . 89_{- 3.19}^{+ 3.73}$ $13.89^{+3.73}_{-3.19}$	$15 . 73_{- 3.84}^{+ 5.24}$ $15.73^{+5.24}_{-3.84}$	$10 . 23_{- 2.18}^{+ 2.19}$ $10.23^{+2.19}_{-2.18}$	$10 . 63_{- 3.10}^{+ 3.70}$ $10.63^{+3.70}_{-3.10}$	$12 . 27_{- 2.89}^{+ 3.74}$ $12.27^{+3.74}_{-2.89}$
gabs1	E (keV)	$12 . 60_{- 0.20}^{+ 0.24}$ $12.60^{+0.24}_{-0.20}$	$12 . 75_{- 0.21}^{+ 0.23}$ $12.75^{+0.23}_{-0.21}$	$12 . 59_{- 0.17}^{+ 0.18}$ $12.59^{+0.18}_{-0.17}$	$14 . 60_{- 0.62}^{+ 0.73}$ $14.60^{+0.73}_{-0.62}$	$14 . 90_{- 0.51}^{+ 0.60}$ $14.90^{+0.60}_{-0.51}$	$14 . 03_{- 0.65}^{+ 0.83}$ $14.03^{+0.83}_{-0.65}$	$14 . 81_{- 0.30}^{+ 0.34}$ $14.81^{+0.34}_{-0.30}$	$14 . 44_{- 0.46}^{+ 0.56}$ $14.44^{+0.56}_{-0.46}$
	σ (keV)	$1 . 88_{- 0.32}^{+ 0.46}$ $1.88^{+0.46}_{-0.32}$	$2 . 17_{- 0.29}^{+ 0.32}$ $2.17^{+0.32}_{-0.29}$	$2 . 39_{- 0.21}^{+ 0.24}$ $2.39^{+0.24}_{-0.21}$	$2 . 89_{- 0.56}^{+ 0.51}$ $2.89^{+0.51}_{-0.56}$	$3 . 14_{- 0.46}^{+ 0.50}$ $3.14^{+0.50}_{-0.46}$	$2 . 82_{- 0.49}^{+ 0.51}$ $2.82^{+0.51}_{-0.49}$	$3 . 14_{- 0.25}^{+ 0.27}$ $3.14^{+0.27}_{-0.25}$	$2 . 82_{- 0.39}^{+ 0.42}$ $2.82^{+0.42}_{-0.39}$
	Depth (keV)	$0 . 78_{- 0.23}^{+ 0.48}$ $0.78^{+0.48}_{-0.23}$	$1 . 14_{- 0.31}^{+ 0.47}$ $1.14^{+0.47}_{-0.31}$	$2 . 27_{- 0.49}^{+ 0.63}$ $2.27^{+0.63}_{-0.49}$	$2 . 87_{- 1.35}^{+ 2.14}$ $2.87^{+2.14}_{-1.35}$	$3 . 62_{- 1.37}^{+ 2.13}$ $3.62^{+2.13}_{-1.37}$	$2 . 15_{- 1.07}^{+ 1.87}$ $2.15^{+1.87}_{-1.07}$	$3 . 29_{- 0.85}^{+ 0.93}$ $3.29^{+0.93}_{-0.85}$	$2 . 87_{- 1.04}^{+ 1.56}$ $2.87^{+1.56}_{-1.04}$
gaussian	E_Fe (keV)	$6 . 56_{- 0.12}^{+ 0.09}$ $6.56^{+0.09}_{-0.12}$	$6 . 53_{- 0.14}^{+ 0.15}$ $6.53^{+0.15}_{-0.14}$	$6 . 46_{- 0.10}^{+ 0.09}$ $6.46^{+0.09}_{-0.10}$	...	...	...	...	...
	σ (keV)	$0 . 22_{- 0.18}^{+ 0.19}$ $0.22^{+0.19}_{-0.18}$	$0 . 47_{- 0.20}^{+ 0.28}$ $0.47^{+0.28}_{-0.20}$	< 0.30	...	...	...	...	...
	N_gau (×10⁻²)	$0 . 65_{- 0.24}^{+ 0.31}$ $0.65^{+0.31}_{-0.24}$	$0 . 88_{- 0.36}^{+ 0.56}$ $0.88^{+0.56}_{-0.36}$	$0 . 59_{- 0.21}^{+ 0.29}$ $0.59^{+0.29}_{-0.21}$	...	...	...	...	...
comptt	T₀ (keV)	< 0.52	< 0.48	< 0.50	< 0.51	< 1.41	< 1.52	< 0.48	< 1.66
	kT (keV)	$4 . 14_{- 0.07}^{+ 0.07}$ $4.14^{+0.07}_{-0.07}$	$4 . 08_{- 0.05}^{+ 0.05}$ $4.08^{+0.05}_{-0.05}$	$4 . 16_{- 0.06}^{+ 0.06}$ $4.16^{+0.06}_{-0.06}$	$3 . 93_{- 0.10}^{+ 0.11}$ $3.93^{+0.11}_{-0.10}$	$3 . 93_{- 0.11}^{+ 0.13}$ $3.93^{+0.13}_{-0.11}$	$3 . 73_{- 0.07}^{+ 0.07}$ $3.73^{+0.07}_{-0.07}$	$3 . 75_{- 0.09}^{+ 0.09}$ $3.75^{+0.09}_{-0.09}$	$3 . 79_{- 0.11}^{+ 0.13}$ $3.79^{+0.13}_{-0.11}$
	τ	$12 . 52_{- 0.72}^{+ 0.84}$ $12.52^{+0.84}_{-0.72}$	$11 . 83_{- 0.40}^{+ 0.55}$ $11.83^{+0.55}_{-0.40}$	$10 . 92_{- 0.29}^{+ 0.36}$ $10.92^{+0.36}_{-0.29}$	$11 . 84_{- 0.34}^{+ 0.42}$ $11.84^{+0.42}_{-0.34}$	$12 . 35_{- 0.39}^{+ 0.50}$ $12.35^{+0.50}_{-0.39}$	$12 . 42_{- 0.34}^{+ 0.39}$ $12.42^{+0.39}_{-0.34}$	$12 . 60_{- 0.35}^{+ 0.39}$ $12.60^{+0.39}_{-0.35}$	$12 . 31_{- 0.36}^{+ 0.41}$ $12.31^{+0.41}_{-0.36}$
	N_comp (×10⁻¹)	$7 . 43_{- 0.60}^{+ 1.06}$ $7.43^{+1.06}_{-0.60}$	$7 . 34_{- 0.22}^{+ 0.43}$ $7.34^{+0.43}_{-0.22}$	$8 . 49_{- 0.11}^{+ 0.28}$ $8.49^{+0.28}_{-0.11}$	$1 . 70_{- 0.02}^{+ 0.03}$ $1.70^{+0.03}_{-0.02}$	$1 . 95_{- 0.03}^{+ 0.06}$ $1.95^{+0.06}_{-0.03}$	$2 . 09_{- 0.02}^{+ 0.02}$ $2.09^{+0.02}_{-0.02}$	$1 . 94_{- 0.02}^{+ 0.03}$ $1.94^{+0.03}_{-0.02}$	$1 . 72_{- 0.02}^{+ 0.03}$ $1.72^{+0.03}_{-0.02}$

	χ²/d.o.f.	993/976	1032/980	979/960	704/677	657/691	729/717	837/721	792/690

Notes. Uncertainties are given at 90% confidence ranges.

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