Probing the polarized emission from the accretion-powered pulsar 4U 1907+09 with IXPE

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Table 3.

Spectral parameters for the best-fit model obtained from the phase-averaged spectro-polarimetric analysis with XSPEC for Obs. 1 and 2.

Component	Parameter	Unit	Obs. 1	Obs. 2	Obs. 1 & 2
`tbabs`	N_H	10²² cm⁻²	4.86 ± 0.17	5.12 ± 0.17	4.99 ± 0.12
`powerlaw`	Γ		1.18 ± 0.04	1.27 ± 0.04	1.22 ± 0.03
`polconst`	PD	%	6.0 ± 1.6	2.2 ± 1.6	3.7 ± 1.1
	PA	deg	69 ± 8	46 ± 23	63 ± 9
`constant`	const_DU2		1.025 ± 0.010	1.027 ± 0.009	1.027 ± 0.007
	const_DU3		1.015 ± 0.010	0.995 ± 0.009	1.005 ± 0.007

	Flux_{2 − 8 keV}^a	10⁻¹⁰ erg s⁻¹ cm⁻²	1.39 ± 0.01	1.47 ± 0.01	1.436 ± 0.009
	χ²/d.o.f.		1133.1/1112	1201.0/1118	1295.9/1241

Notes.

^(a)

The uncertainties are given at the 68.3% (1σ) confidence level and were obtained using the error command in XSPEC with Δχ² = 1 for one parameter of interest. Observed (absorbed) flux in the 2–8 keV range.

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