Limitations and rotation of the two-armed phase spiral in the Milky Way stellar disc

Open Access

Table 1

Free parameters in the model of the phase spiral.

Name	min	max	Description	Unit
α	0	1	Amplitude	−
b	0.005	0.1	Linear winding	pc rad⁻¹
c	0.0	0.004	Quadratic winding	pc rad⁻²
θ₀	−π	π	Angle offset	rad
S	30	70	Scale factor	km s⁻¹ kpc⁻¹
ρ	0.0	0.18	Flattening distance	kpc

Notes. For each parameter we assume a prior probability that is constant between these min and max values.

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