Unveiling the intensity-dependent wake structure of Vela X–1 using MAXI/GSC

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Table 3.

Time-averaged and intensity-resolved wake and wind parameters of Vela X−1 derived from MAXI/GSC data.

Parameter	Orbital	Intensity & orbital
	phase-resolved	phase-resolved
		Low intensity	Mid intensity	High intensity

Θ^(a)	$51 . 5_{- 7.4}^{+ 5.3}$ $51.5^{+5.3}_{-7.4}$	$41 . 0_{- 8.9}^{+ 10.5}$ $41.0^{+10.5}_{-8.9}$	$48 . 0_{- 7.6}^{+ 7.7}$ $48.0^{+7.7}_{-7.6}$	$54 . 0_{- 9.1}^{+ 11.7}$ $54.0^{+11.7}_{-9.1}$
ϵ^(b)	$7 . 0_{- 4.0}^{+ 4.8}$ $7.0^{+4.8}_{-4.0}$	$35 . 0_{- 15.3}^{+ 17.7}$ $35.0^{+17.7}_{-15.3}$	$4 . 02_{- 3.2}^{+ 7.9}$ $4.02^{+7.9}_{-3.2}$	$12 . 5_{- 9.2}^{+ 9.6}$ $12.5^{+9.6}_{-9.2}$
θ^(c)	$6 . 6_{- 1.0}^{+ 0.9}$ $6.6^{+0.9}_{-1.0}$	$6 . 0_{- 1.3}^{+ 1.4}$ $6.0^{+1.4}_{-1.3}$	$5 . 4_{- 1.1}^{+ 1.0}$ $5.4^{+1.0}_{-1.1}$	$10 . 0_{- 1.8}^{+ 2.0}$ $10.0^{+2.0}_{-1.8}$
f	$18 . 5_{- 1.3}^{+ 1.9}$ $18.5^{+1.9}_{-1.3}$	$20 . 5_{- 4.0}^{+ 5.0}$ $20.5^{+5.0}_{-4.0}$	$20 . 0_{- 2.3}^{+ 2.7}$ $20.0^{+2.7}_{-2.3}$	$18 . 0_{- 2.5}^{+ 2.6}$ $18.0^{+2.6}_{-2.5}$
Ṁ/v_∞^(d)	$2 . 83_{- 0.13}^{+ 0.14}$ $2.83^{+0.14}_{-0.13}$	–	–	–
β^SSW	$0 . 98_{- 0.05}^{+ 0.05}$ $0.98^{+0.05}_{-0.05}$	–	–	–
β^wake	$0 . 43_{- 0.09}^{+ 0.09}$ $0.43^{+0.09}_{-0.09}$	–	–	–

Notes. The errors quoted are at a 1σ confidence level.

^(a)

Opening angle in degrees.

^(b)

Phase lag parameter in the units of (10⁻⁴ rad R_⊙⁻¹).

^(c)

Immersion angle in degrees.

^(d)

In the units of (10⁻¹¹ M_⊙ R_⊙⁻¹).

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