The dynamical memory of tidal stellar streams - Joint inference of the Galactic potential and the progenitor of GD-1 with flow matching

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Volume 707 (March 2026)

A&A, 707 (2026) A363

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Table 1

Prior ranges and true values for model parameters.

Parameter	Prior range	True value
Host parameters
M_vir (M_⊙)	$(0.5 M_{v i r}^{t r u e}, 2.0 M_{N F W}^{t r u e})$ $Mathematical equation: $(0.5\,M_{\mathrm{vir}}^{\mathrm{true}},\;2.0\,M_{\mathrm{NFW}}^{\mathrm{true}})$$	4.37 × 10¹¹
r_NFW (kpc)	$(0.5 M_{M N}^{t r u e}, 2.0 M_{M N}^{t r u e})$ $Mathematical equation: $(\,0.5\,M_{\mathrm{MN}}^{\mathrm{true}},\;2.0\,M_{\mathrm{MN}}^{\mathrm{true}}\,)$$	16.0
M_MN (M_⊙)	$(0.5 M_{M N}^{t r u e}, 2.0 M_{M N}^{t r u e})$ $Mathematical equation: $(\,0.5\,M_{\mathrm{MN}}^{\mathrm{true}},\;2.0\,M_{\mathrm{MN}}^{\mathrm{true}}\,)$$	6.82 × 10¹⁰
a_MN (kpc)	$(0.5 a_{M N}^{t r u e}, 2.0 a_{M N}^{t r u e})$ $Mathematical equation: $(\,0.5\,a_{\mathrm{MN}}^{\mathrm{true}},\;2.0\,a_{\mathrm{MN}}^{\mathrm{true}}\,)$$	3.0
Progenitor parameters
t_end (Gyr)	(0.5, 5.0)	3.0
M_Plummer (M_⊙)	(10³⁰, 10^4.5)	1.12 × 10⁴
a_Plummer (kpc)	$(0.5 a_{P l u m m e r}^{t r u e}, 2.0 a_{P l u m m e r}^{t r u e})$ $Mathematical equation: $(0.5\,a_{\mathrm{Plummer}}^{\mathrm{true}},\;2.0\,a_{\mathrm{Plummer}}^{\mathrm{true}})$$	0.008
x^c (kpc)	(10.0, 14.0)	11.8
y^c (kpc)	(0.1, 2.5)	0.79
z^c (kpc)	(6.0, 8.0)	6.4
$v_{x}^{c}$ $Mathematical equation: $v_{x}^c$$ (km s⁻¹)	(90.0, 115.0)	109.5
$v_{y}^{c}$ $Mathematical equation: $v_{y}^c$$ (km s⁻¹)	(−280.0, −230.0)	−254.5
$v_{z}^{c}$ $Mathematical equation: $v_{z}^c$$ (km s⁻¹)	(−120.0, −80.0]	−90.3

Notes. The prior ranges for t_end, M_plummer, $x_{c}^{0}$ $Mathematical equation: $\vec{x}_c^0$$ , $v_{c}^{0}$ $Mathematical equation: $\vec{v}_c^0$$ are taken from Alvey et al. (2023).

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