GaiaUnlimited: The old stellar disc of the Milky Way as traced by the red clump

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Volume 701 (September 2025)

A&A, 701 (2025) A270

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Table 3

Description of Galactic structure parameters.

Parameter	Range	Description
R_d	[1, 5] kpc	Scale length of disc 1.
h_ɀ,⊙	[0.1, 1.5] kpc	Scale height of disc 1 at R_⊙.
log₁₀ R_fl	[−3, 3]	Logarithm of flare scale length (kpc) for disc 1.
f_d1	[0.05, 1.]	Mass fraction of disc 1.
R_d2	[1, 5] kpc	Scale length of disc 2.
h_ɀ2,⊙	[0.1, 1.5] kpc	Scale height of disc 2 at R_⊙.

Warp parameters (disc 1 only):
ϕ_w	[90°, 270°]	ϕ′ of the line of nodes.
R_w	[1, 15] kpc	Radial onset of the warp.
a_w	[0, 5]	Radial exponent of the warp.
h_w0	[0, 5] kpc	Amplitude of the warp.

Notes. Parameters to be fitted and the range of values allowed. The first set of parameters describe the structure of the disc, such as the scale length, scale height and flare. The four parameters that describe the warp are listed separately at the bottom.

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