2009ApJ...694L.144W

Query : 2009ApJ...694L.144W

2009ApJ...694L.144W - Astrophys. J., 694, L144-L147 (2009/April-1)

Leo V: spectroscopy of a distant and disturbed satellite.

WALKER M.G., BELOKUROV V., EVANS N.W., IRWIN M.J., MATEO M., OLSZEWSKI E.W. and GILMORE G.

Abstract (from CDS):

We present a spectroscopic study of Leo V, a recently discovered satellite of the Milky Way (MW). From stellar spectra obtained with the MMT/Hectochelle spectrograph we identify seven likely members of Leo V. Five cluster near the Leo V center (R < 3') and have a velocity dispersion of 2.4+2.4–1.4 km/s. The other two likely members lie near each other but far from the center (R ∼ 13' ∼ 700 pc) and inflate the global velocity dispersion to 3.7+2.3 –1.4 km/s. Assuming the five central members are bound, we obtain a dynamical mass of M = 3.3+9.1–2.5x105 M☉(M/LV= 75+230 –58[M/LV]☉). From the stacked spectrum of the five central members we estimate a mean metallicity of [Fe/H]=-2.0±0.2 dex. Thus, with respect to dwarf spheroidals of similar luminosity, Leo V is slightly less massive and slightly more metal rich. Since we resolve the central velocity dispersion only marginally, we do not rule out the possibility that Leo V is a diffuse star cluster devoid of dark matter. The wide separation of its two outer members implies Leo V is losing mass; however, its large distance (D ∼ 180 kpc) is difficult to reconcile with MW tidal stripping unless the orbit is very radial.

Abstract Copyright: ∼

Journal keyword(s): dark matter - galaxies: dwarf - galaxies: kinematics and dynamics - Local Group

VizieR on-line data: <Available at CDS (J/ApJ/694/L144): table1.dat>

Nomenclature: Table 1: [WBE2009] L5-NNN (Nos 1-158).

Simbad objects: 164

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Number of rows : 164
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
2 [WBE2009] L5-154 * 11 29 13.92 +02 16 26.1           ~ 1 0
3 [WBE2009] L5-151 * 11 29 15.42 +02 13 26.2           ~ 1 0
4 [MSW2019] Leo V-50 * 11 29 21.51 +02 21 55.5           ~ 2 0
5 [WBE2009] L5-143 * 11 29 22.06 +02 08 38.8           ~ 1 0
6 [MSW2019] Leo V-7 * 11 29 30.22 +02 19 35.1           ~ 2 0
7 [WBE2009] L5-115 * 11 29 35.35 +02 18 57.1           ~ 1 0
8 [WBE2009] L5-148 * 11 29 36.39 +02 28 54.9           ~ 1 0
9 [MSW2019] Leo V-9 * 11 29 38.45 +02 26 12.4           ~ 2 0
10 [MSW2019] Leo V-49 * 11 29 41.54 +02 13 34.0           ~ 2 0
11 [MSW2019] Leo V-44 * 11 29 43.04 +02 01 06.0           ~ 2 0
12 [WBE2009] L5-108 * 11 29 43.99 +02 21 06.3           ~ 1 0
13 [MSW2019] Leo V-10 * 11 29 44.25 +02 35 08.3           ~ 2 0
14 [MSW2019] Leo V-42 * 11 29 47.42 +02 00 38.6           ~ 2 0
15 [WBE2009] L5-094 * 11 29 47.81 +02 19 19.3           ~ 1 0
16 [MSW2019] Leo V-46 * 11 29 47.95 +02 06 35.2           ~ 2 0
17 [MSW2019] Leo V-2 * 11 29 48.41 +02 06 34.3           ~ 2 0
18 [WBE2009] L5-088 * 11 29 51.13 +02 10 14.6           ~ 1 0
19 [MSW2019] Leo V-8 * 11 29 52.83 +02 22 24.0           ~ 2 0
20 [WBE2009] L5-083 * 11 29 52.93 +02 10 56.9           ~ 1 0
21 [WBE2009] L5-105 * 11 29 53.21 +02 02 06.6           ~ 1 0
22 [WBE2009] L5-080 * 11 29 53.80 +02 13 27.1           ~ 1 0
23 [MSW2019] Leo V-48 * 11 29 55.05 +02 14 26.4           ~ 2 0
24 [WBE2009] L5-092 * 11 30 03.81 +02 25 59.4           ~ 1 0
25 [MSW2019] Leo V-43 * 11 30 04.25 +02 03 43.9           ~ 2 0
26 [MSW2019] Leo V-0 * 11 30 06.90 +02 07 25.2           ~ 2 0
27 [MSW2019] Leo V-3 * 11 30 14.90 +02 14 30.1           ~ 2 0
28 [MSW2019] Leo V-80 * 11 30 15.44 +01 52 34.1           ~ 2 0
29 [MSW2019] Leo V-81 * 11 30 16.89 +01 49 26.1           ~ 2 0
30 [MSW2019] Leo V-40 * 11 30 17.17 +01 56 17.5           ~ 2 0
31 [MSW2019] Leo V-47 * 11 30 22.55 +02 14 28.7           ~ 2 0
32 [MSW2019] Leo V-41 * 11 30 24.42 +01 54 50.9           ~ 2 0
33 [MSW2019] Leo V-51 * 11 30 24.92 +02 37 01.7           ~ 2 0
34 [WBE2009] L5-138 * 11 30 28.22 +02 37 49.5           ~ 1 0
35 [WBE2009] L5-089 * 11 30 28.95 +02 30 14.4           ~ 1 0
36 [WBE2009] L5-034 * 11 30 29.38 +02 16 10.4           ~ 1 0
37 [WBE2009] L5-054 * 11 30 30.32 +02 03 37.6           ~ 1 0
38 [WBE2009] L5-107 * 11 30 30.38 +02 33 19.8           ~ 1 0
39 [WBE2009] L5-104 * 11 30 30.51 +01 53 26.2           ~ 1 0
40 [MSW2019] Leo V-79 * 11 30 31.90 +01 59 15.3           ~ 2 0
41 [MSW2019] Leo V-45 * 11 30 32.39 +02 11 35.9           ~ 2 0
42 [WBE2009] L5-021 * 11 30 32.87 +02 13 39.3           ~ 1 0
43 [MSW2019] Leo V-52 * 11 30 35.81 +02 30 59.0           ~ 2 0
44 [WBE2009] L5-051 * 11 30 37.70 +02 02 24.5           ~ 1 0
45 [WBE2009] L5-045 * 11 30 37.92 +02 04 13.5           ~ 1 0
46 [WBE2009] L5-030 * 11 30 39.47 +02 19 52.0           ~ 1 0
47 [MSW2019] Leo V-55 * 11 30 41.07 +02 39 16.7           ~ 2 0
48 [MSW2019] Leo V-83 * 11 30 42.60 +01 47 29.8           ~ 2 0
49 [WBE2009] L5-048 * 11 30 43.15 +02 02 49.3           ~ 1 0
50 [WBE2009] L5-013 * 11 30 43.32 +02 14 30.5           ~ 1 0
51 [WBE2009] L5-077 * 11 30 44.85 +01 55 23.3           ~ 1 0
52 [MSW2019] Leo V-78 * 11 30 46.02 +01 49 01.4           ~ 2 0
53 [MSW2019] Leo V-11 * 11 30 48.23 +02 20 48.5           ~ 2 0
54 [MSW2019] Leo V-12 * 11 30 49.29 +02 24 23.5           ~ 2 0
55 [MSW2019] Leo V-56 * 11 30 49.69 +02 26 03.8           ~ 2 0
56 [MSW2019] Leo V-54 * 11 30 51.12 +02 31 32.6           ~ 2 0
57 [MSW2019] Leo V-4 * 11 30 51.47 +02 14 01.5           ~ 2 0
58 [MSW2019] Leo V-57 * 11 30 52.16 +02 25 27.5           ~ 2 0
59 [MSW2019] Leo V-84 * 11 30 53.03 +01 58 20.2           ~ 2 0
60 [MSW2019] Leo V-77 * 11 30 54.68 +02 02 14.7           ~ 2 0
61 [MSW2019] Leo V-53 * 11 30 54.78 +02 22 26.7           ~ 2 0
62 [MSW2019] Leo V-37 * 11 30 54.90 +02 04 11.5           ~ 2 0
63 [WBE2009] L5-152 * 11 30 55.76 +02 41 45.1           ~ 1 0
64 [WBE2009] L5-012 * 11 30 56.41 +02 17 16.3           ~ 1 0
65 [WBE2009] L5-011 * 11 30 58.18 +02 16 59.2           ~ 1 0
66 [MSW2019] Leo V-5 * 11 31 00.01 +02 14 08.7           ~ 2 0
67 [MSW2019] Leo V-34 * 11 31 00.79 +01 48 49.8           ~ 2 0
68 [WBE2009] L5-007 * 11 31 01.66 +02 11 25.2           ~ 2 0
69 [WBE2009] L5-004 RG* 11 31 02.8790855928 +02 13 14.678080968           ~ 3 0
70 [MSW2019] Leo V-13 * 11 31 03.10 +02 20 43.0           ~ 2 0
71 [MSW2019] Leo V-76 * 11 31 03.81 +02 06 18.2           ~ 2 0
72 [WBE2009] L5-057 * 11 31 04.15 +02 26 56.5           ~ 2 0
73 [WBE2009] L5-111 * 11 31 04.84 +01 49 42.4           ~ 1 0
74 [MSW2019] Leo V-35 * 11 31 05.60 +01 53 48.4           ~ 2 0
75 [WBE2009] L5-139 * 11 31 05.71 +02 40 12.4           ~ 1 0
76 [MSW2019] Leo V-38 * 11 31 06.32 +02 01 44.2           ~ 2 0
77 [WBE2009] L5-091 * 11 31 06.49 +01 52 33.4           ~ 1 0
78 [WBE2009] L5-003 * 11 31 07.1646892296 +02 12 18.071895888           ~ 2 0
79 [WBE2009] L5-090 * 11 31 08.35 +02 33 35.7           ~ 1 0
80 [MSW2019] Leo V-39 * 11 31 09.51 +02 09 52.8           ~ 2 0
81 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
82 [WBE2009] L5-002 RG* 11 31 10.5934996392 +02 14 09.526166520           ~ 3 0
83 [WBE2009] L5-125 * 11 31 10.71 +02 38 09.4           ~ 1 0
84 [WBE2009] L5-020 * 11 31 11.17 +02 22 20.3           ~ 1 0
85 [WBE2009] L5-019 * 11 31 12.40 +02 21 40.8           ~ 1 0
86 [WBE2009] L5-082 * 11 31 12.92 +02 32 26.4           ~ 1 0
87 [WBE2009] L5-001 RG* 11 31 13.2111933744 +02 12 51.607116144           ~ 3 0
88 [WBE2009] L5-017 * 11 31 13.92 +02 05 55.7           ~ 1 0
89 [WBE2009] L5-052 * 11 31 14.11 +02 26 36.4           ~ 2 0
90 [WBE2009] L5-005 * 11 31 15.0106721760 +02 14 55.835355912           ~ 3 0
91 [MSW2019] Leo V-36 * 11 31 15.35 +01 46 40.7           ~ 2 0
92 [MSW2019] Leo V-72 * 11 31 15.91 +02 10 57.6           ~ 2 0
93 [MSW2019] Leo V-58 * 11 31 16.31 +02 30 34.6           ~ 2 0
94 [WBE2009] L5-126 * 11 31 18.23 +02 38 15.4           ~ 1 0
95 [MSW2019] Leo V-15 * 11 31 18.70 +02 30 14.1           ~ 2 0
96 [MSW2019] Leo V-17 * 11 31 19.87 +02 19 23.1           ~ 2 0
97 [MSW2019] Leo V-62 * 11 31 20.15 +02 22 07.1           ~ 2 0
98 [MSW2019] Leo V-59 * 11 31 20.75 +02 32 43.8           ~ 2 0
99 [MSW2019] Leo V-19 * 11 31 23.20 +02 19 28.8           ~ 2 0
100 [MSW2019] Leo V-14 * 11 31 26.27 +02 27 43.0           ~ 2 0
101 [MSW2019] Leo V-63 * 11 31 28.77 +02 21 44.7           ~ 2 0
102 [MSW2019] Leo V-16 * 11 31 28.87 +02 28 00.7           ~ 2 0
103 [MSW2019] Leo V-73 * 11 31 29.02 +02 04 38.1           ~ 2 0
104 [MSW2019] Leo V-61 * 11 31 33.57 +02 30 55.5           ~ 2 0
105 [WBE2009] L5-046 * 11 31 34.28 +02 02 54.5           ~ 1 0
106 [MSW2019] Leo V-71 * 11 31 36.12 +02 01 12.5           ~ 2 0
107 [MSW2019] Leo V-21 * 11 31 38.13 +02 22 47.9           ~ 2 0
108 [WBE2009] L5-037 * 11 31 38.20 +02 05 04.3           ~ 1 0
109 [MSW2019] Leo V-33 * 11 31 38.27 +01 52 40.9           ~ 2 0
110 [WBE2009] L5-134 * 11 31 39.53 +01 47 57.8           ~ 1 0
111 [MSW2019] Leo V-74 * 11 31 39.90 +01 56 01.8           ~ 2 0
112 [MSW2019] Leo V-31 * 11 31 42.77 +02 03 46.4           ~ 2 0
113 [MSW2019] Leo V-75 * 11 31 43.10 +01 47 16.4           ~ 2 0
114 [WBE2009] L5-035 * 11 31 43.51 +02 07 00.5           ~ 1 0
115 [MSW2019] Leo V-26 * 11 31 44.49 +02 16 18.2           ~ 2 0
116 [WBE2009] L5-031 * 11 31 46.64 +02 09 10.9           ~ 1 0
117 [WBE2009] L5-033 * 11 31 46.82 +02 17 52.9           ~ 1 0
118 [WBE2009] L5-032 * 11 31 47.76 +02 09 11.2           ~ 1 0
119 [WBE2009] L5-041 * 11 31 47.97 +02 19 57.7           ~ 1 0
120 [WBE2009] L5-038 * 11 31 48.75 +02 07 38.9           ~ 1 0
121 [WBE2009] L5-085 * 11 31 49.14 +01 56 25.1           ~ 1 0
122 [WBE2009] L5-036 * 11 31 49.87 +02 16 59.9           ~ 1 0
123 [WBE2009] L5-043 * 11 31 50.54 +02 19 18.9           ~ 1 0
124 [MSW2019] Leo V-32 * 11 31 51.55 +01 59 37.6           ~ 2 0
125 [MSW2019] Leo V-20 * 11 31 51.87 +02 27 42.4           ~ 2 0
126 [WBE2009] L5-112 * 11 31 52.48 +02 34 26.0           ~ 1 0
127 [WBE2009] L5-131 * 11 31 53.20 +02 36 59.6           ~ 1 0
128 [WBE2009] L5-124 * 11 31 58.94 +01 51 32.4           ~ 1 0
129 [WBE2009] L5-058 * 11 32 03.66 +02 06 44.0           ~ 1 0
130 [MSW2019] Leo V-60 * 11 32 04.26 +02 35 42.9           ~ 2 0
131 [MSW2019] Leo V-28 * 11 32 08.88 +02 07 38.0           ~ 2 0
132 [WBE2009] L5-114 * 11 32 10.02 +02 31 57.5           ~ 1 0
133 [WBE2009] L5-147 * 11 32 10.89 +02 36 41.6           ~ 1 0
134 [WBE2009] L5-072 * 11 32 10.96 +02 03 00.8           ~ 1 0
135 [MSW2019] Leo V-67 * 11 32 11.99 +02 05 00.4           ~ 2 0
136 [MSW2019] Leo V-30 * 11 32 13.24 +01 52 47.6           ~ 2 0
137 [MSW2019] Leo V-29 * 11 32 13.56 +02 02 57.2           ~ 2 0
138 [WBE2009] L5-073 * 11 32 15.74 +02 21 51.0           ~ 1 0
139 [MSW2019] Leo V-18 * 11 32 16.97 +02 39 18.6           ~ 2 0
140 [MSW2019] Leo V-70 * 11 32 17.25 +01 59 26.0           ~ 2 0
141 [WBE2009] L5-109 * 11 32 18.41 +02 28 35.1           ~ 1 0
142 [MSW2019] Leo V-66 * 11 32 18.79 +02 07 47.2           ~ 2 0
143 [WBE2009] L5-067 * 11 32 19.33 +02 12 31.2           ~ 1 0
144 [WBE2009] L5-106 * 11 32 19.37 +01 59 38.8           ~ 1 0
145 [WBE2009] L5-116 * 11 32 22.01 +01 56 49.3           ~ 1 0
146 [MSW2019] Leo V-64 * 11 32 23.33 +02 34 31.2           ~ 2 0
147 [WBE2009] L5-098 * 11 32 25.26 +02 23 30.1           ~ 1 0
148 [MSW2019] Leo V-23 * 11 32 27.48 +02 28 09.4           ~ 2 0
149 [WBE2009] L5-102 * 11 32 30.86 +02 21 32.7           ~ 1 0
150 [WBE2009] L5-110 * 11 32 32.46 +02 02 40.8           ~ 1 0
151 [WBE2009] L5-130 * 11 32 34.15 +01 58 07.4           ~ 1 0
152 [MSW2019] Leo V-24 * 11 32 37.66 +02 29 42.0           ~ 2 0
153 [WBE2009] L5-118 * 11 32 39.42 +02 23 07.5           ~ 1 0
154 [MSW2019] Leo V-68 * 11 32 39.84 +02 03 25.1           ~ 2 0
155 [MSW2019] Leo V-69 * 11 32 40.62 +01 57 55.2           ~ 2 0
156 [WBE2009] L5-127 * 11 32 45.61 +02 21 06.7           ~ 1 0
157 [MSW2019] Leo V-22 * 11 32 50.62 +02 27 28.0           ~ 2 0
158 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
159 [MSW2019] Leo V-65 * 11 32 59.36 +02 12 53.4           ~ 2 0
160 [MSW2019] Leo V-25 * 11 32 59.73 +02 24 10.2           ~ 2 0
161 [WBE2009] L5-155 * 11 33 07.14 +02 10 46.8           ~ 1 0
162 Cl Pal 5 GlC 15 16 05.30 -00 06 41.0   15.1       ~ 797 1
163 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
164 NAME Local Group GrG ~ ~           ~ 9325 0

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