Satellite group infall into the Milky Way: Exploring the Crater-Leo case with new HST proper motions

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Volume 687 (July 2024)

A&A, 687 (2024) A212

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Table 1.

Properties of the Crater-Leo objects.

Object	RA (°)	Dec (°)	M_V	dm	⟨v_los⟩ (km s⁻¹)	⟨[Fe/H]⟩	M^( * ) (10⁶ M_⊙)	References
Leo II	168.3627	22.1529	−9.8 ± 0.3	21.68 ± 0.11	$78 . 30_{- 0.60}^{+ 0.60}$ $78.30^{+0.60}_{-0.60}$	$- 1 . 63_{- 0.01}^{+ 0.01}$ $-1.63^{+0.01}_{-0.01}$	4.6	1, 2, 3, 4, 5, 6
Leo IV	173.2405	−0.5453	−5.8 ± 0.4	20.94 ± 0.07	$131 . 40_{- 1.10}^{+ 1.20}$ $131.40^{+1.20}_{-1.10}$	$- 2 . 47_{- 0.14}^{+ 0.14}$ $-2.47^{+0.14}_{-0.14}$	1.3	1, 7, 8, 9, 6
Leo V	172.7857	2.2194	−5.2 ± 0.4	21.25 ± 0.08	$173 . 00_{- 0.80}^{+ 1.00}$ $173.00^{+1.00}_{-0.80}$	$- 2 . 28_{- 0.16}^{+ 0.15}$ $-2.28^{+0.15}_{-0.16}$	1.1	1, 7, 10, 9, 6
Crater 1	174.0660	−10.8778	−5.3 ± 0.1	20.81 ± 0.05	$149 . 30_{- 1.20}^{+ 1.20}$ $149.30^{+1.20}_{-1.20}$	$- 1 . 68_{- 0.05}^{+ 0.05}$ $-1.68^{+0.05}_{-0.05}$	0.01	11, 12, 13
Crater II	177.3280	−18.4180	−8.2 ± 0.1	20.33 ± 0.07	$87 . 60_{- 0.40}^{+ 0.40}$ $87.60^{+0.40}_{-0.40}$	$- 1 . 95_{- 0.05}^{+ 0.06}$ $-1.95^{+0.06}_{-0.05}$	4.4	14, 15, 16, 17

Notes. Coordinates of the optical centre (RA and Dec) in degrees, absolute magnitude in the V-band (M_V), the distance modulus (dm), heliocentric systemic line-of-sight velocity (⟨v_los⟩) in km s⁻¹, mean stellar metallicity (⟨[Fe/H]⟩), dynamical/stellar mass (M) in solar masses, and the corresponding references. ^( * )For the dwarf galaxies (Leo II, Leo IV, Leo V and Crater II), M corresponds to the dynamical mass inside the half-light radius. For the globular cluster (Crater 1), due to its lack of dark matter, M corresponds to its stellar mass.

References. (1) Muñoz et al. (2018); (2) Irwin & Hatzidimitriou (1995); (3) Gullieuszik et al. (2008); (4) Spencer et al. (2017); (5) Kirby et al. (2013); (6) McConnachie (2012); (7) Jong (2010); (8) Moretti et al. (2009); (9) Jenkins et al. (2021); (10) Mutlu-Pakdil et al. (2019); (11) Belokurov et al. (2014); (12) Weisz et al. (2016); (13) Kirby et al. (2015); (14) Vivas et al. (2020); (15) Torrealba et al. (2016); (16) Caldwell et al. (2017); (17) Fu et al. (2019).

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