2017ApJ...838...11S

Query : 2017ApJ...838...11S

2017ApJ...838...11S - Astrophys. J., 838, 11-11 (2017/March-3)

Nearest neighbor: the low-mass Milky Way satellite Tucana III.

SIMON J.D., LI T.S., DRLICA-WAGNER A., BECHTOL K., MARSHALL J.L., JAMES D.J., WANG M.Y., STRIGARI L., BALBINOT E., KUEHN K., WALKER A.R., ABBOTT T.M.C., ALLAM S., ANNIS J., BENOIT-LEVY A., BROOKS D., BUCKLEY-GEER E., BURKE D.L., CARNERO ROSELL A., CARRASCO KIND M., CARRETERO J., CUNHA C.E., D'ANDREA C.B., DA COSTA L.N., DEPOY D.L., DESAI S., DOEL P., FERNANDEZ E., FLAUGHER B., FRIEMAN J., GARCIA-BELLIDO J., GAZTANAGA E., GOLDSTEIN D.A., GRUEN D., GUTIERREZ G., KUROPATKIN N., MAIA M.A.G., MARTINI P., MENANTEAU F., MILLER C.J., MIQUEL R., NEILSEN E., NORD B., OGANDO R., PLAZAS A.A., ROMER A.K., RYKOFF E.S., SANCHEZ E., SANTIAGO B., SCARPINE V., SCHUBNELL M., SEVILLA-NOARBE I., SMITH R.C., SOBREIRA F., SUCHYTA E., SWANSON M.E.C., TARLE G., WHITEWAY L., YANNY B. (The DES Collaboration)

Abstract (from CDS):

We present Magellan/IMACS spectroscopy of the recently discovered Milky Way satellite Tucana III (Tuc III). We identify 26 member stars in Tuc III from which we measure a mean radial velocity of vhel = -102.3 ± 0.4 (stat.) ± 2.0 (sys.) km s–1, a velocity dispersion of 0.1–0.1+0.7km s–1, and a mean metallicity of [Fe/H]=-2.42–0.08+0.07. The upper limit on the velocity dispersion is σ < 1.5 km s–1 at 95.5% confidence, and the corresponding upper limit on the mass within the half-light radius of Tuc III is 9.0 x 104 M☉. We cannot rule out mass-to-light ratios as large as 240 M☉/L☉ for Tuc III, but much lower mass-to-light ratios that would leave the system baryon-dominated are also allowed. We measure an upper limit on the metallicity spread of the stars in Tuc III of 0.19 dex at 95.5% confidence. Tuc III has a smaller metallicity dispersion and likely a smaller velocity dispersion than any known dwarf galaxy, but a larger size and lower surface brightness than any known globular cluster. Its metallicity is also much lower than those of the clusters with similar luminosity. We therefore tentatively suggest that Tuc III is the tidally stripped remnant of a dark matter-dominated dwarf galaxy, but additional precise velocity and metallicity measurements will be necessary for a definitive classification. If Tuc III is indeed a dwarf galaxy, it is one of the closest external galaxies to the Sun. Because of its proximity, the most luminous stars in Tuc III are quite bright, including one star at V = 15.7 that is the brightest known member star of an ultra-faint satellite.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): dark matter - galaxies: dwarf - galaxies: individual: Tucana III - galaxies: stellar content - Local Group - stars: abundances - stars: abundances

VizieR on-line data: <Available at CDS (J/ApJ/838/11): table2.dat>

Simbad objects: 127

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Number of rows : 127
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 SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 NAME Tri II G 02 13 17.40 +36 10 42.4           ~ 164 0
3 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
4 NAME Hor I G 02 55 31.7 -54 07 08           ~ 169 0
5 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
6 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
8 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
9 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
10 NAME UMa Region reg 11 00 +50.0           ~ 333 0
11 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
12 * q Vir PM* 12 33 46.7485436339 -09 27 07.478534302   5.45 5.48     B9V 79 0
13 Cl Pal 5 GlC 15 16 05.30 -00 06 41.0   15.1       ~ 797 1
14 HD 140283 Pe* 15 43 03.0971190219 -10 56 00.595693188 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 985 0
15 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 138 0
16 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
17 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
18 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
19 GCl 124 GlC 23 06 44.48 +12 46 19.2   15.6       ~ 307 1
20 DES J235421.50-593432.2 * 23 54 21.5253339576 -59 34 32.258938368           ~ 3 0
21 DES J235440.00-593807.2 * 23 54 40.0118651352 -59 38 07.274574924           ~ 2 0
22 DES J235443.22-593753.1 * 23 54 43.2373356672 -59 37 53.243374332           ~ 2 0
23 DES J235453.12-593505.3 * 23 54 53.1365259192 -59 35 05.499147588           ~ 3 0
24 DES J235456.88-592811.2 * 23 54 56.9087569176 -59 28 11.364806208           ~ 2 0
25 DES J235457.61-593733.9 * 23 54 57.6227898384 -59 37 34.026333996           ~ 3 0
26 DES J235459.50-593510.4 * 23 54 59.5149302280 -59 35 10.416405264           ~ 1 0
27 DES J235500.62-593035.5 * 23 55 00.6469777944 -59 30 35.536201740           ~ 3 0
28 DES J235500.75-593157.8 * 23 55 00.7866814200 -59 31 57.943246404           ~ 2 0
29 DES J235500.98-593459.0 * 23 55 00.9868110408 -59 34 59.068393068           ~ 2 0
30 DES J235501.69-593126.3 * 23 55 01.7220810672 -59 31 26.475257712           ~ 2 0
31 DES J235514.47-592929.2 * 23 55 14.5073964936 -59 29 29.354420904           ~ 2 0
32 DES J235514.96-593037.6 * 23 55 14.9870434488 -59 30 37.747211976           ~ 1 0
33 DES J235515.82-592848.7 * 23 55 15.8518062984 -59 28 48.788303880           ~ 2 0
34 DES J235515.86-592703.6 * 23 55 15.8579690568 -59 27 03.590180100           ~ 1 0
35 DES J235523.86-592926.5 * 23 55 23.8587952560 -59 29 26.629558224           ~ 2 0
36 DES J235526.38-592747.9 * 23 55 26.4260323584 -59 27 47.910774780           ~ 2 0
37 DES J235532.68-593115.0 * 23 55 32.6946605952 -59 31 15.049317072           ~ 9 0
38 DES J235534.70-592520.3 * 23 55 34.7195545104 -59 25 20.313797340           ~ 2 0
39 DES J235536.68-592552.4 * 23 55 36.67 -59 25 52.4           ~ 1 0
40 DES J235542.74-592710.6 * 23 55 42.7537390608 -59 27 10.679145948           ~ 2 0
41 DES J235549.92-593259.7 * 23 55 49.9347828744 -59 32 59.696894220           ~ 6 0
42 DES J235555.49-593246.3 * 23 55 55.5047638440 -59 32 46.429459656           ~ 2 0
43 DES J235555.60-593156.2 * 23 55 55.6254630144 -59 31 56.255076264           ~ 2 0
44 DES J235602.62-593257.8 * 23 56 02.6513509560 -59 32 57.938090712           ~ 3 0
45 DES J235606.52-593418.8 * 23 56 06.5648760840 -59 34 18.797749356           ~ 2 0
46 DES J235607.60-593022.1 * 23 56 07.6094608416 -59 30 21.851904744           ~ 1 0
47 DES J235610.63-593458.8 * 23 56 10.6647890160 -59 34 58.979553168           ~ 2 0
48 DES J235612.07-593247.5 * 23 56 12.07 -59 32 47.5           ~ 1 0
49 DES J235612.82-592842.7 * 23 56 12.8545541664 -59 28 42.839898060           ~ 3 0
50 DES J235614.39-593313.2 * 23 56 14.4265528896 -59 33 13.399256088           ~ 2 0
51 DES J235614.85-593022.1 * 23 56 14.8506277176 -59 30 22.141060416           ~ 2 0
52 DES J235615.35-593049.8 * 23 56 15.3808097160 -59 30 49.930134408           ~ 2 0
53 DES J235615.42-592934.8 * 23 56 15.4468986768 -59 29 34.926501156           ~ 2 0
54 DES J235616.92-593045.5 * 23 56 16.9510348632 -59 30 45.594382212           ~ 2 0
55 DES J235620.18-593518.8 * 23 56 20.18 -59 35 18.9           ~ 1 0
56 DES J235620.75-593310.1 * 23 56 20.7783807264 -59 33 10.199931408           ~ 4 0
57 DES J235624.48-593300.4 * 23 56 24.5098706160 -59 33 00.504120708           ~ 2 0
58 DES J235628.84-593241.4 * 23 56 28.8648953928 -59 32 41.494034760           ~ 3 0
59 DES J235632.52-593427.1 * 23 56 32.5554500808 -59 34 27.334028784           ~ 2 0
60 DES J235634.88-593240.6 * 23 56 34.9023463872 -59 32 40.739515404           ~ 1 0
61 DES J235634.87-593001.1 * 23 56 34.9037263488 -59 30 01.243964052           ~ 1 0
62 DES J235635.09-593423.6 * 23 56 35.1044029704 -59 34 23.735918604           ~ 2 0
63 NAME Tuc III G 23 56.6 -59 36           ~ 229 0
64 DES J235640.91-593301.7 * 23 56 40.9317012768 -59 33 01.806487560           ~ 1 0
65 DES J235645.16-593320.2 * 23 56 45.1987620792 -59 33 20.405164824           ~ 2 0
66 DES J235645.76-593544.2 * 23 56 45.7903681536 -59 35 44.323022364           ~ 2 0
67 DES J235646.83-593652.8 * 23 56 46.8562216992 -59 36 52.926188364           ~ 2 0
68 DES J235650.49-593420.9 * 23 56 50.5160167968 -59 34 21.049359528           ~ 4 0
69 DES J235652.54-593123.1 * 23 56 52.5464938584 -59 31 23.117533464           ~ 2 0
70 DES J235655.21-593758.0 * 23 56 55.1871078432 -59 37 58.032772032           ~ 1 0
71 DES J235655.47-593707.5 * 23 56 55.5006489912 -59 37 07.671574452           ~ 3 0
72 DES J235655.78-593641.9 * 23 56 55.8086905224 -59 36 42.087876948           ~ 1 0
73 DES J235656.72-593518.4 * 23 56 56.7489381216 -59 35 18.410945208           ~ 2 0
74 DES J235656.95-594126.5 * 23 56 56.9755995264 -59 41 26.650996944           ~ 3 0
75 DES J235657.00-593718.3 * 23 56 56.9991790080 -59 37 18.300896580           ~ 1 0
76 DES J235700.42-593043.1 * 23 57 00.4467338640 -59 30 43.251279696           ~ 2 0
77 DES J235701.15-593153.2 * 23 57 01.1757840960 -59 31 53.375754792           ~ 1 0
78 DES J235703.01-593824.6 * 23 57 03.01 -59 38 24.6           ~ 1 0
79 DES J235704.33-593151.9 * 23 57 04.3479167472 -59 31 51.984716772           ~ 1 0
80 DES J235704.40-593951.1 * 23 57 04.4216232816 -59 39 51.222925764           ~ 1 0
81 DES J235704.96-593543.4 * 23 57 05.0043499248 -59 35 43.332699120           ~ 1 0
82 DES J235707.45-593742.9 * 23 57 07.4798012568 -59 37 43.045546728           ~ 4 0
83 DES J235707.90-594223.7 * 23 57 07.9310034384 -59 42 23.867611344           ~ 1 0
84 DES J235708.66-592723.5 * 23 57 08.6980089816 -59 27 23.591859876           ~ 2 0
85 DES J235709.04-593400.3 * 23 57 09.04 -59 34 00.3           ~ 1 0
86 DES J235710.69-593149.9 * 23 57 10.7130060936 -59 31 50.043910368           ~ 1 0
87 DES J235712.50-593716.4 * 23 57 12.5246873952 -59 37 16.570596360           ~ 2 0
88 DES J235716.79-592851.0 * 23 57 16.8104504592 -59 28 51.218059152           ~ 1 0
89 DES J235717.09-594015.2 * 23 57 17.1159470400 -59 40 15.358879596           ~ 2 0
90 DES J235719.02-593456.6 * 23 57 19.0082766672 -59 34 56.471853396           ~ 2 0
91 DES J235721.26-593632.4 * 23 57 21.26 -59 36 32.4           ~ 1 0
92 DES J235722.98-593628.5 * 23 57 22.9903312920 -59 36 28.724521824           ~ 2 0
93 DES J235726.03-593938.1 * 23 57 26.0579029872 -59 39 38.243482272           ~ 4 0
94 DES J235726.62-593433.6 * 23 57 26.6503352136 -59 34 33.715009056           ~ 1 0
95 DES J235728.94-593222.6 * 23 57 28.9634415672 -59 32 22.745576724           ~ 3 0
96 DES J235729.11-592730.7 * 23 57 29.1357762624 -59 27 30.762869292           ~ 2 0
97 DES J235730.23-592930.6 * 23 57 30.2603089560 -59 29 30.740385948           ~ 4 0
98 DES J235730.51-593110.4 * 23 57 30.5202855792 -59 31 10.513450668           ~ 2 0
99 DES J235732.29-593913.0 * 23 57 32.3144200920 -59 39 13.116926376           ~ 2 0
100 DES J235732.74-593453.2 * 23 57 32.7661441032 -59 34 53.415147936           ~ 1 0
101 DES J235733.29-593545.1 * 23 57 33.2624296968 -59 35 45.364261812           ~ 2 0
102 DES J235737.91-593723.0 * 23 57 37.91 -59 37 23.1           ~ 1 0
103 DES J235738.50-593611.7 * 23 57 38.5118229432 -59 36 11.763919548           ~ 6 0
104 DES J235738.70-593650.6 * 23 57 38.7136198344 -59 36 50.571256932           ~ 2 0
105 DES J235738.96-593549.9 * 23 57 38.9898267888 -59 35 50.126574876           ~ 2 0
106 DES J235740.73-593444.4 * 23 57 40.7417769120 -59 34 44.571152100           ~ 2 0
107 DES J235742.88-593509.4 * 23 57 42.8975032272 -59 35 09.306686112           ~ 2 0
108 DES J235745.45-593726.4 * 23 57 45.4721860296 -59 37 26.516253720           ~ 4 0
109 DES J235751.61-593233.2 * 23 57 51.6262140912 -59 32 33.381902796           ~ 3 0
110 DES J235754.88-593217.1 * 23 57 54.9151029840 -59 32 17.149409448           ~ 2 0
111 DES J235755.96-593614.7 * 23 57 55.9849100112 -59 36 14.732306100           ~ 2 0
112 DES J235805.42-593630.9 * 23 58 05.4387486552 -59 36 31.124635380           ~ 2 0
113 DES J235810.14-594410.4 * 23 58 10.1720342712 -59 44 10.644607320           ~ 2 0
114 DES J235811.57-594441.3 * 23 58 11.5999607712 -59 44 41.552021292           ~ 1 0
115 DES J235811.96-594150.0 * 23 58 11.9893777080 -59 41 50.189979444           ~ 1 0
116 DES J235813.15-593721.4 * 23 58 13.1804871120 -59 37 21.222790500           ~ 2 0
117 DES J235814.12-593112.7 * 23 58 14.1436396920 -59 31 12.807346728           ~ 1 0
118 DES J235815.00-593809.9 * 23 58 15.0368292888 -59 38 10.046119920           ~ 1 0
119 DES J235821.27-594229.9 * 23 58 21.2847637392 -59 42 30.099973824           ~ 1 0
120 DES J235823.12-593250.7 * 23 58 23.1404593296 -59 32 50.788298076           ~ 2 0
121 DES J235826.09-594056.8 * 23 58 26.1152627376 -59 40 57.007118712           ~ 2 0
122 DES J235828.48-594201.9 * 23 58 28.4998591416 -59 42 02.117572164           ~ 2 0
123 DES J235828.88-593527.0 * 23 58 28.9211243400 -59 35 27.142803132           ~ 2 0
124 DES J235831.24-593957.3 * 23 58 31.2718996128 -59 39 57.465975096           ~ 2 0
125 DES J235832.47-593354.4 * 23 58 32.5053906936 -59 33 54.432866376           ~ 2 0
126 DES J235841.01-594300.3 * 23 58 41.0440263120 -59 43 00.465863988           ~ 2 0
127 NAME Local Group GrG ~ ~           ~ 9325 0

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