2019ApJ...885...53M

Query : 2019ApJ...885...53M

2019ApJ...885...53M - Astrophys. J., 885, 53-53 (2019/November-1)

Signatures of tidal disruption in ultra-faint dwarf galaxies: a combined HST, Gaia, and MMT/Hectochelle study of Leo V.

MUTLU-PAKDIL B., SAND D.J., WALKER M.G., CALDWELL N., CARLIN J.L., COLLINS M.L., CRNOJEVIC D., MATEO M., OLSZEWSKI E.W., SETH A.C., STRADER J., WILLMAN B. and ZARITSKY D.

Abstract (from CDS):

The ultra-faint dwarf galaxy Leo V has shown both photometric overdensities and kinematic members at large radii, along with a tentative kinematic gradient, suggesting that it may have undergone a close encounter with the Milky Way. We investigate these signs of disruption through a combination of (i) high precision photometry obtained with the Hubble Space Telescope (HST), (ii) two epochs of stellar spectra obtained with the Hectochelle Spectrograph on the MMT, and (iii) measurements from the Gaia mission. Using the HST data, we examine one of the reported stream-like overdensities at large radii, and conclude that it is not a true stellar stream, but instead a clump of foreground stars and background galaxies. Our spectroscopic analysis shows that one known member star is likely a binary, and challenges the membership status of three others, including two distant candidates that had formerly provided evidence for overall stellar mass loss. We also find evidence that the proposed kinematic gradient across Leo V might be due to small number statistics. We update the systemic proper motion of Leo V, finding (µαcosδ,µδ)=(0.009±0.560, -0.777 ± 0.314) mas yr–1, which is consistent with its reported orbit that did not put Leo V at risk of being disturbed by the Milky Way. These findings remove most of the observational clues that suggested Leo V was disrupting; however, we also find new plausible member stars, two of which are located >5 half-light radii from the main body. These stars require further investigation. Therefore, the nature of Leo V still remains an open question.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): Dwarf galaxies - Stellar populations - Tidal disruption - Galactic and extragalactic astronomy - HST photometry - Spectroscopy

VizieR on-line data: <Available at CDS (J/ApJ/885/53): table2.dat table3.dat table4.dat table5.dat table6.dat>

Nomenclature: Tables 2-3: [MSW2019] FieldN-ACS NNNN N=2466+1231. Tables 2-3: [MSW2019] FieldN-WFC3 NNN N=538+416. Table 6: [MSW2019] LeoV-NNN (Nos 0-116).

Simbad objects: 142

goto Full paper

goto View the references in ADS

Number of rows : 142
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 NAME Tri II G 02 13 17.40 +36 10 42.4           ~ 164 0
2 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
3 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
4 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
5 [MSW2019] Leo V-91 * 11 29 16.76 +02 10 27.7           ~ 1 0
6 [MSW2019] Leo V-50 * 11 29 21.51 +02 21 55.5           ~ 2 0
7 [MSW2019] Leo V-7 * 11 29 30.22 +02 19 35.1           ~ 2 0
8 [MSW2019] Leo V-95 * 11 29 33.45 +02 25 34.4           ~ 1 0
9 [MSW2019] Leo V-93 * 11 29 37.08 +02 16 21.3           ~ 1 0
10 [MSW2019] Leo V-9 * 11 29 38.45 +02 26 12.4           ~ 2 0
11 [MSW2019] Leo V-49 * 11 29 41.54 +02 13 34.0           ~ 2 0
12 [MSW2019] Leo V-44 * 11 29 43.04 +02 01 06.0           ~ 2 0
13 [MSW2019] Leo V-10 * 11 29 44.25 +02 35 08.3           ~ 2 0
14 [MSW2019] Leo V-90 * 11 29 45.13 +02 07 20.5           ~ 1 0
15 [MSW2019] Leo V-94 * 11 29 46.97 +02 18 58.5           ~ 1 0
16 [MSW2019] Leo V-42 * 11 29 47.42 +02 00 38.6           ~ 2 0
17 [MSW2019] Leo V-46 * 11 29 47.95 +02 06 35.2           ~ 2 0
18 [MSW2019] Leo V-2 * 11 29 48.41 +02 06 34.3           ~ 2 0
19 [MSW2019] Leo V-8 * 11 29 52.83 +02 22 24.0           ~ 2 0
20 [MSW2019] Leo V-48 * 11 29 55.05 +02 14 26.4           ~ 2 0
21 [MSW2019] Leo V-97 * 11 30 01.92 +02 31 41.9           ~ 1 0
22 [MSW2019] Leo V-92 * 11 30 04.09 +02 13 24.0           ~ 1 0
23 [MSW2019] Leo V-43 * 11 30 04.25 +02 03 43.9           ~ 2 0
24 [MSW2019] Leo V-82 * 11 30 05.41 +01 59 35.1           ~ 1 0
25 [MSW2019] Leo V-0 * 11 30 06.90 +02 07 25.2           ~ 2 0
26 [MSW2019] Leo V-86 * 11 30 08.64 +01 56 13.6           ~ 1 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-96 * 11 30 18.63 +02 18 22.1           ~ 1 0
32 [MSW2019] Leo V-47 * 11 30 22.55 +02 14 28.7           ~ 2 0
33 [MSW2019] Leo V-41 * 11 30 24.42 +01 54 50.9           ~ 2 0
34 [MSW2019] Leo V-51 * 11 30 24.92 +02 37 01.7           ~ 2 0
35 [MSW2019] Leo V-79 * 11 30 31.90 +01 59 15.3           ~ 2 0
36 [MSW2019] Leo V-45 * 11 30 32.39 +02 11 35.9           ~ 2 0
37 [MSW2019] Leo V-98 * 11 30 32.52 +02 37 49.2           ~ 1 0
38 [MSW2019] Leo V-88 * 11 30 34.14 +02 01 26.6           ~ 1 0
39 [MSW2019] Leo V-52 * 11 30 35.81 +02 30 59.0           ~ 2 0
40 [MSW2019] Leo V-55 * 11 30 41.07 +02 39 16.7           ~ 2 0
41 [MSW2019] Leo V-85 * 11 30 41.58 +02 02 11.9           ~ 1 0
42 [MSW2019] Leo V-83 * 11 30 42.60 +01 47 29.8           ~ 2 0
43 [MSW2019] Leo V-89 * 11 30 43.19 +02 07 33.0           ~ 1 0
44 [MSW2019] Leo V-78 * 11 30 46.02 +01 49 01.4           ~ 2 0
45 [MSW2019] Leo V-11 * 11 30 48.23 +02 20 48.5           ~ 2 0
46 [MSW2019] Leo V-12 * 11 30 49.29 +02 24 23.5           ~ 2 0
47 [MSW2019] Leo V-56 * 11 30 49.69 +02 26 03.8           ~ 2 0
48 [MSW2019] Leo V-54 * 11 30 51.12 +02 31 32.6           ~ 2 0
49 [MSW2019] Leo V-4 * 11 30 51.47 +02 14 01.5           ~ 2 0
50 [MSW2019] Leo V-57 * 11 30 52.16 +02 25 27.5           ~ 2 0
51 [MSW2019] Leo V-87 * 11 30 52.44 +02 07 44.0           ~ 1 0
52 [MSW2019] Leo V-84 * 11 30 53.03 +01 58 20.2           ~ 2 0
53 [MSW2019] Leo V-77 * 11 30 54.68 +02 02 14.7           ~ 2 0
54 [MSW2019] Leo V-53 * 11 30 54.78 +02 22 26.7           ~ 2 0
55 [MSW2019] Leo V-37 * 11 30 54.90 +02 04 11.5           ~ 2 0
56 [CTS2017] 17 RG* 11 30 57.3 +02 09 45           ~ 2 0
57 HiTS J113057+021330 RR* 11 30 57.47 +02 13 30.5           ~ 4 0
58 [MSW2019] Leo V-5 * 11 31 00.01 +02 14 08.7           ~ 2 0
59 [MSW2019] Leo V-34 * 11 31 00.79 +01 48 49.8           ~ 2 0
60 [WBE2009] L5-007 * 11 31 01.66 +02 11 25.2           ~ 2 0
61 [WBE2009] L5-004 RG* 11 31 02.8790855928 +02 13 14.678080968           ~ 3 0
62 [MSW2019] Leo V-13 * 11 31 03.10 +02 20 43.0           ~ 2 0
63 [MSW2019] Leo V-76 * 11 31 03.81 +02 06 18.2           ~ 2 0
64 [WBE2009] L5-057 * 11 31 04.15 +02 26 56.5           ~ 2 0
65 HiTS J113105+021319 RR* 11 31 04.65 +02 13 19.2           ~ 3 0
66 [MSW2019] Leo V-35 * 11 31 05.60 +01 53 48.4           ~ 2 0
67 [CTS2017] 27 * 11 31 06.3 +02 13 00           ~ 2 0
68 [MSW2019] Leo V-38 * 11 31 06.32 +02 01 44.2           ~ 2 0
69 HiTS J113107+021302 * 11 31 06.6 +02 13 02           ~ 4 0
70 [MSW2019] Leo V-99 * 11 31 08.42 +02 19 41.3           ~ 1 0
71 [CTS2017] 32 RG* 11 31 08.5590408768 +02 13 09.774945336           ~ 2 0
72 [MSW2019] Leo V-39 * 11 31 09.51 +02 09 52.8           ~ 2 0
73 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
74 [WBE2009] L5-002 RG* 11 31 10.5934996392 +02 14 09.526166520           ~ 3 0
75 [CTS2017] 41 RG* 11 31 12.0639699528 +02 12 59.639176188           ~ 2 0
76 [WBE2009] L5-001 RG* 11 31 13.2111933744 +02 12 51.607116144           ~ 3 0
77 [WBE2009] L5-052 * 11 31 14.11 +02 26 36.4           ~ 2 0
78 [WBE2009] L5-005 * 11 31 15.0106721760 +02 14 55.835355912           ~ 3 0
79 [MSW2019] Leo V-36 * 11 31 15.35 +01 46 40.7           ~ 2 0
80 [MSW2019] Leo V-72 * 11 31 15.91 +02 10 57.6           ~ 2 0
81 [MSW2019] Leo V-58 * 11 31 16.31 +02 30 34.6           ~ 2 0
82 [MSW2019] Leo V-15 * 11 31 18.70 +02 30 14.1           ~ 2 0
83 [MSW2019] Leo V-17 * 11 31 19.87 +02 19 23.1           ~ 2 0
84 [MSW2019] Leo V-115 * 11 31 20.00 +01 51 54.9           ~ 1 0
85 [MSW2019] Leo V-62 * 11 31 20.15 +02 22 07.1           ~ 2 0
86 [MSW2019] Leo V-116 * 11 31 20.24 +01 54 41.9           ~ 1 0
87 [MSW2019] Leo V-59 * 11 31 20.75 +02 32 43.8           ~ 2 0
88 [MSW2019] Leo V-19 * 11 31 23.20 +02 19 28.8           ~ 2 0
89 [MSW2019] Leo V-14 * 11 31 26.27 +02 27 43.0           ~ 2 0
90 [MSW2019] Leo V-63 * 11 31 28.77 +02 21 44.7           ~ 2 0
91 [MSW2019] Leo V-16 * 11 31 28.87 +02 28 00.7           ~ 2 0
92 [MSW2019] Leo V-73 * 11 31 29.02 +02 04 38.1           ~ 2 0
93 [MSW2019] Leo V-100 * 11 31 32.23 +02 30 32.4           ~ 1 0
94 [MSW2019] Leo V-61 * 11 31 33.57 +02 30 55.5           ~ 2 0
95 [MSW2019] Leo V-104 * 11 31 35.95 +02 18 46.7           ~ 1 0
96 [MSW2019] Leo V-71 * 11 31 36.12 +02 01 12.5           ~ 2 0
97 [MSW2019] Leo V-21 * 11 31 38.13 +02 22 47.9           ~ 2 0
98 [MSW2019] Leo V-33 * 11 31 38.27 +01 52 40.9           ~ 2 0
99 [MSW2019] Leo V-74 * 11 31 39.90 +01 56 01.8           ~ 2 0
100 [MSW2019] Leo V-114 * 11 31 40.65 +01 50 10.8           ~ 1 0
101 [MSW2019] Leo V-101 * 11 31 40.79 +02 36 40.0           ~ 1 0
102 [MSW2019] Leo V-31 * 11 31 42.77 +02 03 46.4           ~ 2 0
103 [MSW2019] Leo V-75 * 11 31 43.10 +01 47 16.4           ~ 2 0
104 [MSW2019] Leo V-26 * 11 31 44.49 +02 16 18.2           ~ 2 0
105 [MSW2019] Leo V-32 * 11 31 51.55 +01 59 37.6           ~ 2 0
106 [MSW2019] Leo V-20 * 11 31 51.87 +02 27 42.4           ~ 2 0
107 [MSW2019] Leo V-109 * 11 31 56.01 +02 13 55.0           ~ 1 0
108 [MSW2019] Leo V-60 * 11 32 04.26 +02 35 42.9           ~ 2 0
109 [MSW2019] Leo V-28 * 11 32 08.88 +02 07 38.0           ~ 2 0
110 [MSW2019] Leo V-103 * 11 32 11.60 +02 33 48.0           ~ 1 0
111 [MSW2019] Leo V-113 * 11 32 11.81 +01 53 11.9           ~ 1 0
112 [MSW2019] Leo V-67 * 11 32 11.99 +02 05 00.4           ~ 2 0
113 [MSW2019] Leo V-30 * 11 32 13.24 +01 52 47.6           ~ 2 0
114 [MSW2019] Leo V-29 * 11 32 13.56 +02 02 57.2           ~ 2 0
115 [MSW2019] Leo V-102 * 11 32 14.20 +02 28 17.7           ~ 1 0
116 [MSW2019] Leo V-112 * 11 32 15.23 +01 56 32.0           ~ 1 0
117 [MSW2019] Leo V-18 * 11 32 16.97 +02 39 18.6           ~ 2 0
118 [MSW2019] Leo V-70 * 11 32 17.25 +01 59 26.0           ~ 2 0
119 [MSW2019] Leo V-66 * 11 32 18.79 +02 07 47.2           ~ 2 0
120 [MSW2019] Leo V-106 * 11 32 20.28 +02 16 51.3           ~ 1 0
121 [MSW2019] Leo V-64 * 11 32 23.33 +02 34 31.2           ~ 2 0
122 [MSW2019] Leo V-23 * 11 32 27.48 +02 28 09.4           ~ 2 0
123 [MSW2019] Leo V-111 * 11 32 35.81 +02 06 29.5           ~ 1 0
124 [MSW2019] Leo V-24 * 11 32 37.66 +02 29 42.0           ~ 2 0
125 [MSW2019] Leo V-68 * 11 32 39.84 +02 03 25.1           ~ 2 0
126 [MSW2019] Leo V-69 * 11 32 40.62 +01 57 55.2           ~ 2 0
127 [MSW2019] Leo V-110 * 11 32 42.62 +02 07 07.8           ~ 1 0
128 [MSW2019] Leo V-108 * 11 32 44.95 +02 22 24.7           ~ 1 0
129 [MSW2019] Leo V-22 * 11 32 50.62 +02 27 28.0           ~ 2 0
130 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
131 [MSW2019] Leo V-65 * 11 32 59.36 +02 12 53.4           ~ 2 0
132 [MSW2019] Leo V-25 * 11 32 59.73 +02 24 10.2           ~ 2 0
133 [MSW2019] Leo V-107 * 11 33 04.41 +02 20 24.2           ~ 1 0
134 NAME Crater II Dwarf Galaxy G 11 49 14 -18 24.8           ~ 176 0
135 NAME Bootes III G 13 57 07.4 +26 46 30     12.6     ~ 115 1
136 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 138 0
137 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
138 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
139 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
140 NAME Sagittarius II Gl? 19 52 40.5 -22 04 05           ~ 97 0
141 NAME Tuc V G 23 37.4 -63 16           ~ 84 0
142 NAME Tuc III G 23 56.6 -59 36           ~ 229 0

To bookmark this query, right click on this link: simbad:objects in 2019ApJ...885...53M and select 'bookmark this link' or equivalent in the popup menu