Revealing two orthogonally polarized spectral components in Vela X-1 with IXPE

Open Access

Table 1.

Best-fit spectro-polarimetric parameters of model (1) for the dataset.

Component	Parameter	Unit	Value
`tbabs`	N_H	10²² cm⁻²	10.0 ± 0.5
`tbpcf`	N_H, tbpcf	10²² cm⁻²	$28 . 2_{- 1.1}^{+ 1.3}$ $28.2_{-1.1}^{+1.3}$
	f_cov		0.94 ± 0.01
`powerlaw`	Γ		1.08 ± 0.06
`bremss`	kT	keV	0.70 ± 0.04
	Norm		$33_{- 10}^{+ 12}$ $33_{-10}^{+12}$
`constant`	const_DU2		1.014 ± 0.003
	const_DU3		0.994 ± 0.003
`polconst`	PD_bremss	%	5.4 ± 1.4
	PA_bremss	deg	41 ± 7
`polconst`	PD_po	%	6.2 ± 0.7
	PA_po	deg	−49 ± 3

	χ² (d.o.f.)		1566 (1328)

Notes. Uncertainties computed using the error command are given at the 68.3% (1σ) confidence level (Δχ² = 1 for one parameter of interest).

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