2019MNRAS.485.2010G

Query : 2019MNRAS.485.2010G

2019MNRAS.485.2010G - Mon. Not. R. Astron. Soc., 485, 2010-2025 (2019/May-2)

Kinematics of the Tucana Dwarf Galaxy: an unusually dense dwarf in the Local Group.

GREGORY A.L., COLLINS M.L.M., READ J.I., IRWIN M.J., IBATA R.A., MARTIN N.F., McCONNACHIE A.W. and WEISZ D.R.

Abstract (from CDS):

We present new FLAMES+GIRAFFE spectroscopy of 36 member stars in the isolated Local Group dwarf spheroidal galaxy Tucana. We measure a systemic velocity for the system of vTuc = 216.7–2.8+2.9 km s–1, and a velocity dispersion of σv,Tuc = 14.4–2.3+2.8 km s–1. We also detect a rotation gradient of d/vr dχ= 7.6+4.2–4.3 km s–1 kpc–1, which reduces the systemic velocity to vTuc = 215.2–2.7+2.8 km s–1 and the velocity dispersion to σv,Tuc = 13.3–2.3+2.7 km s–1. We perform Jeans modelling of the density profile of Tucana, using the line-of-sight velocities of the member stars. We find that it favours a high central density consistent with 'pristine' subhaloes in Λ cold dark matter, and a massive dark matter halo (∼1010 M☉) consistent with expectations from abundance matching. Tucana appears to be significantly more centrally dense than other isolated Local Group dwarfs, making it an ideal laboratory for testing dark matter models.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: haloes - galaxies: kinematics and dynamics - Local Group

VizieR on-line data: <Available at CDS (J/MNRAS/485/2010): table2.dat table3.dat>

Nomenclature: Tables 2-3: [GCR2019] NNNNNN N=131 among (Nos 4032-100021).

Simbad objects: 148

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Number of rows : 148
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 Andromeda XVIII G 00 02 14.5 +45 05 20     16.0     ~ 129 0
2 NAME Cetus Dwarf Galaxy G 00 26 10.8 -11 03 14     13.2     ~ 257 0
3 NAME Magellanic Stream HVC 00 32 -30.0           ~ 1079 1
4 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
5 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 526 0
6 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
7 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
8 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
9 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
10 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
11 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
12 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
13 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
14 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
15 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
16 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
17 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
18 [GCR2019] 22297 * 22 40 31.541 -64 12 55.40     21.895   20.688 ~ 2 0
19 [GCR2019] 28959 * 22 40 31.661 -64 15 53.60     22.808   21.283 ~ 2 0
20 [GCR2019] 45927 * 22 40 32.870 -64 22 47.60     22.964   21.509 ~ 2 0
21 [GCR2019] 39557 * 22 40 34.219 -64 20 13.70     22.481   21.281 ~ 2 0
22 [GCR2019] 51322 * 22 40 45.130 -64 24 45.70     22.476   21.120 ~ 2 0
23 [GCR2019] 25382 * 22 40 45.569 -64 14 19.60           ~ 2 0
24 [GCR2019] 45504 * 22 40 52.310 -64 22 36.90     23.023   21.510 ~ 2 0
25 [GCR2019] 20262 * 22 40 52.330 -64 12 02.90     22.595   20.826 ~ 2 0
26 [GCR2019] 43254 * 22 40 56.830 -64 21 41.80     22.178   21.031 ~ 2 0
27 [GCR2019] 13504 * 22 40 59.150 -64 09 18.50     22.938   21.329 ~ 2 0
28 [GCR2019] 54972 * 22 41 00.089 -64 25 43.70     23.127   22.017 ~ 2 0
29 [GCR2019] 32371 * 22 41 01.380 -64 17 16.30     22.674   20.963 ~ 2 0
30 [GCR2019] 39444 * 22 41 01.730 -64 20 11.00     22.121   20.730 ~ 2 0
31 [GCR2019] 22526 * 22 41 06.269 -64 13 01.50     22.241   19.161 ~ 2 0
32 [GCR2019] 34818 * 22 41 09.761 -64 18 16.40     22.643   21.338 ~ 2 0
33 [GCR2019] 28804 * 22 41 09.929 -64 15 49.40     22.447   21.320 ~ 2 0
34 [GCR2019] 30380 * 22 41 10.990 -64 16 27.00     23.089   21.909 ~ 2 0
35 [GCR2019] 9224 * 22 41 15.070 -64 07 36.40     22.600   21.255 ~ 2 0
36 [GCR2019] 44431 * 22 41 15.610 -64 22 08.30     22.904   21.351 ~ 2 0
37 [GCR2019] 39993 * 22 41 18.449 -64 20 24.10     21.844   20.614 ~ 2 0
38 [GCR2019] 100020 * 22 41 18.941 -64 25 29.60     24.880   22.406 ~ 2 0
39 [GCR2019] 44068 * 22 41 21.850 -64 22 00.40     22.976   20.486 ~ 2 0
40 [GCR2019] 31104 * 22 41 22.320 -64 16 45.20     22.230   20.723 ~ 2 0
41 [GCR2019] 47569 * 22 41 22.339 -64 23 26.20     22.61   21.33 ~ 2 0
42 [FTI2009] 19 RG* 22 41 24.799 -64 24 52.20   24.12 22.59 21.78 21.0 ~ 3 0
43 [GCR2019] 7717 * 22 41 27.070 -64 06 53.10     23.246   22.057 ~ 2 0
44 [GCR2019] 33846 * 22 41 27.250 -64 17 52.70     22.937   21.543 ~ 2 0
45 [GCR2019] 51422 * 22 41 27.470 -64 24 47.40     23.310   22.180 ~ 2 0
46 [GCR2019] 51120 * 22 41 28.541 -64 24 41.90     22.996   21.890 ~ 2 0
47 [GCR2019] 24956 * 22 41 30.900 -64 14 08.80           ~ 2 0
48 [FTI2009] 20 RG* 22 41 31.380 -64 27 13.10   21.28 20.716 20.34 19.920 ~ 3 0
49 [GCR2019] 50864 * 22 41 33.060 -64 24 36.90     22.89   21.55 ~ 2 0
50 [GCR2019] 38665 * 22 41 33.660 -64 19 52.80     20.370   19.311 ~ 2 0
51 [BMG2009] Tucana V9 RG* 22 41 35.599 -64 24 40.90   23.840 22.44 21.66 20.98 ~ 4 0
52 [GCR2019] 49196 * 22 41 36.689 -64 24 04.00     23.340   22.133 ~ 2 0
53 [FTI2009] 17 RG* 22 41 38.321 -64 24 08.20   23.74 22.41 21.67 21.03 ~ 3 0
54 [GCR2019] 43720 * 22 41 40.409 -64 21 52.40     21.006   19.251 ~ 2 0
55 [FTI2009] 8 RG* 22 41 40.870 -64 24 57.80   24.11 22.68 21.90 21.28 ~ 3 0
56 [GCR2019] 25558 * 22 41 40.939 -64 14 24.10     22.349   20.730 ~ 2 0
57 [GCR2019] 27434 * 22 41 41.009 -64 15 15.30     22.831   22.089 ~ 2 0
58 [GCR2019] 49958 * 22 41 41.530 -64 24 19.00     22.881   21.748 ~ 2 0
59 [GCR2019] 46004 * 22 41 41.750 -64 22 49.50     22.728   21.480 ~ 2 0
60 [FTI2009] 6 RG* 22 41 44.270 -64 24 30.00     22.37   21.01 ~ 3 0
61 [GCR2019] 43472 * 22 41 45.679 -64 21 47.10     22.615   21.174 ~ 2 0
62 [GCR2019] 50951 * 22 41 46.690 -64 24 38.60     22.730   21.691 ~ 2 0
63 [GCR2019] 20184 * 22 41 46.730 -64 12 01.20     22.705   20.813 ~ 2 0
64 [FTI2009] 2 RG* 22 41 47.270 -64 25 20.30   23.91 22.44 21.62 20.97 ~ 3 0
65 [GCR2019] 50350 * 22 41 48.120 -64 24 27.00     22.775   21.648 ~ 2 0
66 [GCR2019] 5642 * 22 41 48.439 -64 05 57.60           ~ 2 0
67 [GCR2019] 7674 * 22 41 49.159 -64 06 51.50     22.383   21.151 ~ 2 0
68 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 324 0
69 [FTI2009] 15 RG* 22 41 49.980 -64 23 41.50   23.29 22.22 21.51 20.96 ~ 3 0
70 [GCR2019] 100002 * 22 41 51.470 -64 25 25.70     21.317   20.260 ~ 2 0
71 [GCR2019] 53700 * 22 41 51.869 -64 25 23.20           ~ 2 0
72 [GCR2019] 26562 * 22 41 53.400 -64 14 52.90     22.589   21.159 ~ 2 0
73 [GCR2019] 23752 * 22 41 53.549 -64 13 36.20     23.407   20.383 ~ 2 0
74 [FTI2009] 4 RG* 22 41 53.890 -64 25 05.90   23.76 22.39 21.56 20.87 ~ 3 0
75 [GCR2019] 27260 * 22 41 54.079 -64 15 11.10     22.898   21.565 ~ 2 0
76 [GCR2019] 5411 * 22 41 54.770 -64 05 51.30     22.284   21.120 ~ 2 0
77 [GCR2019] 41818 * 22 41 55.349 -64 21 09.40           ~ 2 0
78 [FTI2009] 7 RG* 22 41 58.140 -64 25 25.00   23.77 22.63 21.92 21.35 ~ 3 0
79 [GCR2019] 37852 * 22 41 58.759 -64 19 34.70     23.199   21.657 ~ 2 0
80 [FTI2009] 10 ** 22 41 59.069 -64 24 42.20   23.95 22.45 21.69 21.01 ~ 3 0
81 [FTI2009] 14 RG* 22 42 01.781 -64 24 25.90   23.77 22.28 21.55 20.86 ~ 3 0
82 [GCR2019] 32116 * 22 42 01.879 -64 17 09.90     22.204   20.595 ~ 2 0
83 [GCR2019] 4032 * 22 42 02.030 -64 05 14.20     22.940   21.389 ~ 2 0
84 [GCR2019] 30098 * 22 42 02.350 -64 16 20.20     17.807   16.986 ~ 2 0
85 [GCR2019] 34523 * 22 42 03.360 -64 18 08.50     22.602   21.179 ~ 2 0
86 [GCR2019] 42547 * 22 42 04.901 -64 21 25.90     22.577   21.207 ~ 2 0
87 [GCR2019] 49630 * 22 42 06.670 -64 24 12.70     23.15   21.92 ~ 2 0
88 [GCR2019] 41813 * 22 42 07.841 -64 21 09.30     22.750   21.276 ~ 2 0
89 [GCR2019] 52007 * 22 42 10.049 -64 24 57.20     23.23   22.03 ~ 2 0
90 [GCR2019] 31905 * 22 42 11.059 -64 17 05.20     22.730   21.167 ~ 2 0
91 [GCR2019] 39027 * 22 42 11.210 -64 20 00.80     22.992   21.378 ~ 2 0
92 [GCR2019] 28726 * 22 42 12.190 -64 15 47.40     23.994   21.447 ~ 2 0
93 [GCR2019] 39325 * 22 42 13.680 -64 20 07.80     23.549   20.742 ~ 2 0
94 [GCR2019] 40996 * 22 42 13.920 -64 20 49.60     21.789   19.157 ~ 2 0
95 [GCR2019] 21201 * 22 42 14.561 -64 12 25.30     22.672   20.824 ~ 2 0
96 [GCR2019] 28435 * 22 42 15.341 -64 15 40.40           ~ 2 0
97 [GCR2019] 22014 * 22 42 16.070 -64 12 47.50     22.229   20.861 ~ 2 0
98 [GCR2019] 16892 * 22 42 16.159 -64 10 44.10     22.773   21.559 ~ 2 0
99 [GCR2019] 32638 * 22 42 16.260 -64 17 23.50     22.388   20.678 ~ 2 0
100 [FTI2009] 22 RG* 22 42 16.610 -64 23 00.60   23.69 22.39 21.42 20.62 ~ 3 0
101 [GCR2019] 19228 * 22 42 17.179 -64 11 40.10     23.355   22.151 ~ 2 0
102 [GCR2019] 32163 * 22 42 20.580 -64 17 11.00     22.559   20.710 ~ 2 0
103 [GCR2019] 21138 * 22 42 22.841 -64 12 23.70     23.023   21.318 ~ 2 0
104 [GCR2019] 35540 * 22 42 25.020 -64 18 34.50     23.512   21.524 ~ 2 0
105 [GCR2019] 32288 * 22 42 25.980 -64 17 14.50     21.536   19.870 ~ 2 0
106 [GCR2019] 24848 * 22 42 27.670 -64 14 06.10     22.317   20.877 ~ 2 0
107 [GCR2019] 52613 * 22 42 28.090 -64 25 06.80     23.114   21.918 ~ 2 0
108 [GCR2019] 40705 * 22 42 28.819 -64 20 42.60     23.701   22.204 ~ 2 0
109 [GCR2019] 31326 * 22 42 31.140 -64 16 51.50     22.065   20.503 ~ 2 0
110 [GCR2019] 21919 * 22 42 31.970 -64 12 45.10     22.609   21.043 ~ 2 0
111 [GCR2019] 54691 * 22 42 32.040 -64 25 39.20     23.203   22.063 ~ 2 0
112 [GCR2019] 31878 * 22 42 35.621 -64 17 04.60     22.696   21.652 ~ 2 0
113 [GCR2019] 18416 * 22 42 36.449 -64 11 18.90     22.400   21.031 ~ 2 0
114 [GCR2019] 54894 * 22 42 38.650 -64 25 42.30     23.263   21.835 ~ 2 0
115 [GCR2019] 48384 * 22 42 41.210 -64 23 46.00     22.925   21.382 ~ 2 0
116 [GCR2019] 48450 * 22 42 47.249 -64 23 47.40     23.093   22.168 ~ 2 0
117 [GCR2019] 25301 * 22 42 47.261 -64 14 17.50     23.488   22.373 ~ 2 0
118 [GCR2019] 60765 * 22 42 47.369 -64 27 54.30     22.639   21.274 ~ 2 0
119 [GCR2019] 21528 * 22 42 48.749 -64 12 35.00     22.354   20.615 ~ 2 0
120 [GCR2019] 20980 * 22 42 50.230 -64 12 19.90     22.358   20.702 ~ 2 0
121 [GCR2019] 32477 * 22 42 54.079 -64 17 18.90     22.329   20.713 ~ 2 0
122 [GCR2019] 24957 * 22 43 00.389 -64 14 08.80     22.854   21.301 ~ 2 0
123 [GCR2019] 19109 * 22 43 00.989 -64 11 37.60     23.158   21.607 ~ 2 0
124 [GCR2019] 31071 * 22 43 02.501 -64 16 44.40     22.194   20.633 ~ 2 0
125 [GCR2019] 24991 * 22 43 02.530 -64 14 09.50     23.274   22.108 ~ 2 0
126 [GCR2019] 13690 * 22 43 02.861 -64 09 22.80     22.987   21.887 ~ 2 0
127 [GCR2019] 53621 * 22 43 04.500 -64 25 22.00     22.723   21.204 ~ 2 0
128 [GCR2019] 52574 * 22 43 05.170 -64 25 06.00     23.343   22.174 ~ 2 0
129 [GCR2019] 43260 * 22 43 10.759 -64 21 42.00     21.816   20.598 ~ 2 0
130 [GCR2019] 23221 * 22 43 10.870 -64 13 21.10     22.896   21.570 ~ 2 0
131 [GCR2019] 47042 * 22 43 12.830 -64 23 13.50     23.206   22.295 ~ 2 0
132 [GCR2019] 34708 * 22 43 15.509 -64 18 13.40     22.380   21.111 ~ 2 0
133 [GCR2019] 16300 * 22 43 15.790 -64 10 30.00     22.232   20.746 ~ 2 0
134 [GCR2019] 18966 * 22 43 17.381 -64 11 33.90     22.928   21.727 ~ 2 0
135 [GCR2019] 51984 * 22 43 18.790 -64 24 56.70     22.555   21.163 ~ 2 0
136 [GCR2019] 54686 * 22 43 21.079 -64 25 39.10     22.108   20.905 ~ 2 0
137 [GCR2019] 20561 * 22 43 21.761 -64 12 10.30     21.969   20.723 ~ 2 0
138 [GCR2019] 20829 * 22 43 27.581 -64 12 15.90     22.850   21.214 ~ 2 0
139 [GCR2019] 35409 * 22 43 35.710 -64 18 31.40     22.419   20.780 ~ 2 0
140 [GCR2019] 48246 * 22 43 37.930 -64 23 42.40     23.503   22.183 ~ 2 0
141 [GCR2019] 26258 * 22 43 39.250 -64 14 44.10     22.960   21.634 ~ 2 0
142 [GCR2019] 25087 * 22 43 40.889 -64 14 12.00     23.166   21.664 ~ 2 0
143 [GCR2019] 32709 * 22 43 41.160 -64 17 25.10     22.070   20.786 ~ 2 0
144 [GCR2019] 22156 * 22 43 42.300 -64 12 51.60     22.016   20.832 ~ 2 0
145 [GCR2019] 28008 * 22 43 43.190 -64 15 30.50           ~ 2 0
146 [GCR2019] 40477 * 22 43 43.601 -64 20 37.20     19.724   18.922 ~ 2 0
147 [GCR2019] 35289 * 22 43 48.761 -64 18 28.30     22.275   21.177 ~ 2 0
148 NAME Local Group GrG ~ ~           ~ 9325 0

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