2015ApJ...808...95S

Query : 2015ApJ...808...95S

2015ApJ...808...95S - Astrophys. J., 808, 95 (2015/July-3)

Stellar kinematics and metallicities in the ultra-faint dwarf galaxy Reticulum II.

SIMON J.D., DRLICA-WAGNER A., LI T.S., NORD B., GEHA M., BECHTOL K., BALBINOT E., BUCKLEY-GEER E., LIN H., MARSHALL J., SANTIAGO B., STRIGARI L., WANG M., WECHSLER R.H., YANNY B., ABBOTT T., BAUER A.H., BERNSTEIN G.M., BERTIN E., BROOKS D., BURKE D.L., CAPOZZI D., CARNERO ROSELL A., CARRASCO KIND M., D'ANDREA C.B., DA COSTA L.N., DEPOY D.L., DESAI S., DIEHL H.T., DODELSON S., CUNHA C.E., ESTRADA J., EVRARD A.E., NETO A.F., FERNANDEZ E., FINLEY D.A., FLAUGHER B., FRIEMAN J., GAZTANAGA E., GERDES D., GRUEN D., GRUENDL R.A., HONSCHEID K., JAMES D., KENT S., KUEHN K., KUROPATKIN N., LAHAV O., MAIA M.A.G., MARCH M., MARTINI P., MILLER C.J., MIQUEL R., OGANDO R., ROMER A.K., ROODMAN A., RYKOFF E.S., SAKO M., SANCHEZ E., SCHUBNELL M., SEVILLA I., SMITH R.C., SOARES-SANTOS M., SOBREIRA F., SUCHYTA E., SWANSON M.E.C., TARLE G., THALER J., TUCKER D., VIKRAM V., WALKER A.R., WESTER W. (The DES Collaboration)

Abstract (from CDS):

We present Magellan/M2FS, Very Large Telescope/GIRAFFE, and Gemini South/GMOS spectroscopy of the newly discovered Milky Way satellite Reticulum II. Based on the spectra of 25 Ret II member stars selected from Dark Energy Survey imaging, we measure a mean heliocentric velocity of and a velocity dispersion of. The mass-to-light ratio of Ret II within its half-light radius is, demonstrating that it is a strongly dark matter-dominated system. Despite its spatial proximity to the Magellanic Clouds, the radial velocity of Ret II differs from that of the LMC and SMC by 199 and 83, respectively, suggesting that it is not gravitationally bound to the Magellanic system. The likely member stars of Ret II span 1.3 dex in metallicity, with a dispersion of 0.28±0.09 dex, and we identify several extremely metal-poor stars with. In combination with its luminosity, size, and ellipticity, these results confirm that Ret II is an ultra-faint dwarf galaxy. With a mean metallicity of, Ret II matches Segue 1 as the most metal-poor galaxy known. Although Ret II is the third-closest dwarf galaxy to the Milky Way, the line-of-sight integral of the dark matter density squared is within 0.°2, indicating that the predicted gamma-ray flux from dark matter annihilation in Ret II is lower than that of several other dwarf galaxies.

Abstract Copyright: ∼

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

VizieR on-line data: <Available at CDS (J/ApJ/808/95): table1.dat>

Simbad objects: 72

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Number of rows : 72
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 Magellanic Stream HVC 00 32 -30.0           ~ 1079 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 NAME Hor I G 02 55 31.7 -54 07 08           ~ 169 0
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
5 [WMO2015] 90 * 03 33 41.7169478616 -54 00 07.182685656           ~ 3 0
6 [WMO2015] 89 * 03 34 05.5033755456 -54 03 49.951367712           ~ 3 0
7 [WMO2015] 87 * 03 34 13.0523106744 -53 59 56.107014036           ~ 3 0
8 [WMO2015] 103 * 03 34 13.9379927352 -54 09 34.426217016           ~ 3 0
9 [WMO2015] 102 * 03 34 18.3336536184 -54 10 06.054749832           ~ 3 0
10 [WMO2015] 110 * 03 34 29.9536320504 -54 11 11.742581580           ~ 4 0
11 DES J033430.07-540922.2 * 03 34 30.0669306528 -54 09 22.260709908           ~ 5 0
12 [WMO2015] 76 * 03 34 36.7104088320 -54 06 44.911485540           ~ 5 0
13 DES J033437.34-535354.0 * 03 34 37.3488629664 -53 53 53.896945236           ~ 2 0
14 [WMO2015] 72 * 03 34 37.9963841016 -54 13 59.586905856           ~ 2 0
15 DES J033439.66-540754.4 * 03 34 39.6668368152 -54 07 54.300369576           ~ 5 0
16 DES J033439.81-540058.5 * 03 34 39.8142396720 -54 00 58.485870576           ~ 5 0
17 DES J033447.93-540525.0 Pe* 03 34 47.9500542384 -54 05 24.970508448           ~ 14 0
18 [WMO2015] 92 * 03 34 49.2163994712 -53 50 19.707205452           ~ 3 0
19 [WMO2015] 77 * 03 34 53.2392561456 -54 14 03.898568652           ~ 2 0
20 DES J033453.50-540454.6 * 03 34 53.5096910232 -54 04 54.438298392           ~ 1 0
21 [WMO2015] 79 RG* 03 34 54.2533761000 -54 05 57.980511384           ~ 16 0
22 [WMO2015] 129 RG* 03 34 57.5852522640 -54 05 31.339557060           ~ 17 0
23 [WMO2015] 69 RG* 03 35 02.5105885368 -54 03 54.204400440           ~ 7 0
24 DES J033502.87-540109.8 * 03 35 02.8809456768 -54 01 09.775369164           ~ 3 0
25 [WMO2015] 128 * 03 35 06.5737879176 -54 06 04.274100432           ~ 5 0
26 DES J033509.50-540229.7 * 03 35 09.5131046952 -54 02 29.656057848           ~ 6 0
27 [WMO2015] 63 RG* 03 35 11.6703262968 -54 03 21.731456196           ~ 8 0
28 [WMO2015] 138 RG* 03 35 13.7453505648 -54 04 56.655085548           ~ 8 0
29 [WMO2015] 136 * 03 35 14.0264400216 -54 05 58.111844820           ~ 6 0
30 [WMO2015] 134 RG* 03 35 15.1862935368 -54 08 42.972210996           ~ 8 0
31 DES J033517.01-540403.0 RG* 03 35 17.0223677112 -54 04 02.985655404           ~ 7 0
32 [WMO2015] 49 * 03 35 20.3774931192 -54 18 16.869611268           ~ 2 0
33 [WMO2015] 126 RG* 03 35 20.9779360032 -54 03 48.091263480           ~ 9 0
34 [KCB2015] Reti 4 RG* 03 35 23.8544722128 -54 04 07.586442660           ~ 29 0
35 DES J033524.00-540226.7 * 03 35 24.0163905840 -54 02 26.611552392           ~ 4 0
36 DES J033524.96-540230.7 HB* 03 35 24.9720171072 -54 02 30.646653180           ~ 6 0
37 [WMO2015] 115 RG* 03 35 31.1536864104 -54 01 48.157854492           ~ 17 0
38 DES J033533.71-535025.4 * 03 35 33.7150039488 -53 50 25.277090172           ~ 2 0
39 DES J033535.44-540254.9 * 03 35 35.4511481280 -54 02 54.800233368           ~ 4 0
40 [WMO2015] 147 * 03 35 36.9478957224 -53 54 45.070859232           ~ 2 0
41 [WMO2015] 35 RG* 03 35 37.0733902248 -54 04 01.174004400           ~ 15 0
42 DES J033539.04-535556.4 * 03 35 39.0520034784 -53 55 56.412377256           ~ 5 0
43 DES J033539.85-540458.1 * 03 35 39.8652176640 -54 04 58.059026544           ~ 4 0
44 [WMO2015] 32 * 03 35 40.7102925216 -54 10 04.984676832           ~ 3 0
45 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
46 [WMO2015] 142 * 03 35 44.1945431640 -54 01 49.937576052           ~ 4 0
47 DES J033546.17-540733.9 * 03 35 46.1801199840 -54 07 33.824411184           ~ 6 0
48 DES J033547.47-535926.5 * 03 35 47.4922227984 -53 59 26.417786424           ~ 1 0
49 [KCB2015] Reti 15 RG* 03 35 48.0547676520 -54 03 49.765718808           ~ 14 0
50 DES J033549.96-540321.5 * 03 35 49.9620417432 -54 03 21.465729756           ~ 5 0
51 DES J033550.10-540139.2 * 03 35 50.1096364296 -54 01 39.159549696           ~ 5 0
52 DES J033552.08-540733.9 * 03 35 52.0934524608 -54 07 33.849740496           ~ 2 0
53 DES J033556.28-540316.3 RG* 03 35 56.2923112560 -54 03 16.203729492           ~ 12 0
54 [WMO2015] 40 RG* 03 35 58.1606163624 -54 02 04.708487076           ~ 8 0
55 [WMO2015] 6 RG* 03 36 01.7748520320 -54 04 05.417140152           ~ 8 0
56 DES J033603.90-540026.5 * 03 36 03.9170581848 -54 00 26.517976596           ~ 5 0
57 DES J033606.25-540144.5 * 03 36 06.2631672672 -54 01 44.429770488           ~ 3 0
58 [KCB2015] Reti 18 RG* 03 36 07.7638135488 -54 02 35.507879592           ~ 21 0
59 DES J033618.68-535745.1 RG* 03 36 18.6924535368 -53 57 45.054873360           ~ 7 0
60 [WMO2015] 23 * 03 36 21.8768515584 -54 00 40.578717564           ~ 4 0
61 DES J033622.83-535955.5 * 03 36 22.8479798424 -53 59 55.447770840           ~ 6 0
62 DES J033623.52-540518.9 * 03 36 23.5047521640 -54 05 18.882516228           ~ 4 0
63 DES J033635.75-540156.9 * 03 36 35.7483816504 -54 01 56.747393328           ~ 6 0
64 DES J033635.78-540120.2 * 03 36 35.7940552176 -54 01 20.126322552           ~ 4 0
65 NAME Eridanus II G 03 44 21.1 -43 32 00           ~ 216 0
66 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
67 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
68 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
69 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
70 HD 122563 Pe* 14 02 31.8455084952 +09 41 09.944391876 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 920 0
71 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 192 0
72 NAME Local Group GrG ~ ~           ~ 9325 0

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