Making counter-orbiting tidal debris - The origin of the Milky Way disc of satellites?

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Table 3

Pro-and retrograde particle properties.

Symbol	All (d_apo > 30 kpc)		Far (d_apo > 60 kpc)
	prograde	retrograde	prograde	retrograde

7.5deg100vel
(Merger)
N	36 800	6000	15 000	2250
f_N [%]	7.36	1.20	3.0	0.45
M [10⁸ M_⊙]	5.89	0.96	2.40	0.36
P_retro	0.14		0.13
e	0.76	0.76	0.77	0.94
Δe	0.09	0.18	0.08	0.02
⟨ d_ini ⟩ [kpc]	5.89	6.02	6.75	5.38
Δ ⟨ d_ini ⟩ [kpc]	1.33	1.27	0.95	0.86
[kpc]	5.96	5.92	6.85	5.20

5deg200vel
(Fly-by)
N	3450	2300	1920	170
f_N [%]	0.69	0.46	0.384	0.034
M [10⁷ M_⊙]	5.52	3.68	3.07	0.27
P_retro	0.40		0.08
e	0.82	0.80	0.80	0.93
Δe	0.08	0.11	0.08	0.03
⟨ d_ini ⟩ [kpc]	5.89	6.73	6.07	7.23
Δ ⟨ d_ini ⟩ [kpc]	1.05	0.68	1.07	0.71
[kpc]	6.02	6.68	6.23	7.30

Notes. N is the number of particles with measured apocentre of at least 30 (all) and 60 (far) kpc, corresponding to a total mass M and f_N, the fraction of total particle number of the infalling galaxy. The mean orbit eccentricity is denoted with e, having a standard deviation of Δe. Similarly, ⟨ d_ini ⟩ stands for the mean initial radial distance within the infalling galaxy, given in kpc. Δ ⟨ d_ini ⟩ is the standard deviation and the median value. The values were determined by demanding the particles to be inside the circles of acceptance (COA) for at least 12 of the 15 analysed steps.

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