ESPRESSO reveals a single but perturbed broad-line region in the supermassive black hole binary candidate PG 1302–102

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Volume 693 (January 2025)

A&A, 693 (2025) A117

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Table 2.

Summary of the spiral model parameters.

Description	Name	Prior range	Spiral model
Inclination	i [rad]	[0, π/4]	$0 . 71_{- 0.01}^{+ 0.01}$ $0.71^{+0.01}_{-0.01}$
Spiral contrast	log₁₀A	[ − 2, 4.5]	$4 . 22_{- 0.03}^{+ 0.03}$ $4.22^{+0.03}_{-0.03}$
Spiral width	δ [rad]	[0, 2π]	$0 . 0085_{- 0.0004}^{+ 0.0004}$ $0.0085^{+0.0004}_{-0.0004}$
Spiral azimuthal origin	ϕ₀ [rad]	[0, 2π]	$1 . 43_{- 0.001}^{+ 0.03}$ $1.43^{+0.03}_{-0.001}$
Pitch angle	p [rad]	[0, π]	$0 . 540_{- 0.001}^{+ 0.001}$ $0.540^{+0.001}_{-0.001}$
Hβ broadening parameter	log₁₀FWHM_Hβ [Å]	[2, 4]	$3 . 573_{- 0.003}^{+ 0.003}$ $3.573^{+ 0.003}_{-0.003}$
Hγ broadening parameter	log₁₀FWHM_Hγ [Å]	[2, 4]	$3 . 472_{- 0.005}^{+ 0.005}$ $3.472^{+ 0.005}_{-0.005}$
Hβ scale radius	log₁₀ξ_c, Hβ [R_g]	[2.3, 4.3]	$3 . 13_{- 0.1}^{+ 0.1}$ $3.13^{+0.1}_{-0.1}$
Hγ scale radius	log₁₀ξ_c, Hγ [R_g]	[2.3, 4.3]	$3 . 190_{- 0.002}^{+ 0.002}$ $3.190^{+0.002}_{-0.002}$
Hβ radial width	log₁₀σ_{ξ_c, Hβ} [R_g]	[2.3, 4.3]	$2 . 98_{- 0.01}^{+ 0.01}$ $2.98^{+0.01}_{-0.01}$
Hγ radial width	log₁₀σ_{ξ_c, Hγ} [R_g]	[2.3, 4.3]	$2 . 60_{- 0.01}^{+ 0.01}$ $2.60^{+0.01}_{-0.01}$
Hβ luminosity	log₁₀L_Hβ [L₀]	[ − 2, 2]	$- 0 . 21_{- 0.03}^{+ 0.02}$ $-0.21^{+0.02}_{-0.03}$
Hγ luminosity	log₁₀L_Hγ [L₀]	[ − 2, 2]	$- 0 . 88_{- 0.03}^{+ 0.02}$ $-0.88^{+0.02}_{-0.03}$

log evidence	log Z	–	206 941

Notes. From left to right, the columns detail a brief description of each parameter, its reference name as used in this work, the assumed prior range, and the best-fit values with their statistical errors. Priors are assumed to be either uniform or log-uniform for each parameter, except for the inclination angle, for which we assumed a uniform distribution on the solid angle.

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