2011ApJ...736..146K

Query : 2011ApJ...736..146K

2011ApJ...736..146K - Astrophys. J., 736, 146 (2011/August-1)

Accurate stellar kinematics at faint magnitudes: application to the Bootes I dwarf spheroidal galaxy.

KOPOSOV S.E., GILMORE G., WALKER M.G., BELOKUROV V., EVANS N.W., FELLHAUER M., GIEREN W., GEISLER D., MONACO L., NORRIS J.E., OKAMOTO S., PENARRUBIA J., WILKINSON M., WYSE R.F.G. and ZUCKER D.B.

Abstract (from CDS):

We develop, implement, and characterize an enhanced data reduction approach which delivers precise, accurate, radial velocities from moderate resolution spectroscopy with the fiber-fed VLT/FLAMES+GIRAFFE facility. This facility, with appropriate care, delivers radial velocities adequate to resolve the intrinsic velocity dispersions of the very faint dwarf spheroidal (dSph) galaxies. Importantly, repeated measurements let us reliably calibrate our individual velocity errors (0.2 km/s ≤ δV ≤ 5 km/s) and directly detect stars with variable radial velocities. We show, by application to the Boötes I dSph, that the intrinsic velocity dispersion of this system is significantly below 6.5 km/s reported by previous studies. Our data favor a two-population model of Boötes I, consisting of a majority "cold" stellar component, with velocity dispersion 2.4+0.9_- 0.5_ km/s, and a minority "hot" stellar component, with velocity dispersion ∼9 km/s, although we cannot completely rule out a single component distribution with velocity dispersion 4.60.8_- 0.6_ km/s. We speculate that this complex velocity distribution actually reflects the distribution of velocity anisotropy in Boötes I, which is a measure of its formation processes.

Abstract Copyright: ∼

Journal keyword(s): galaxies: dwarf - galaxies: individual: Bo"otes I - galaxies: kinematics and dynamics - methods: data analysis - techniques: radial velocities

VizieR on-line data: <Available at CDS (J/ApJ/736/146): table1.dat>

Simbad objects: 129

goto Full paper

goto View the references in ADS

Number of rows : 129
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
3 NAME HYA SUPERCL SCG 08 57.9 +03 10           ~ 204 0
4 2MASS J13583380+1421083 RB? 13 58 33.8132852928 +14 21 08.488847052           ~ 30 0
5 [NGW2008] 980 RB? 13 59 12.6811477896 +13 42 55.710720072           ~ 11 0
6 SDSS J135921.36+143606.3 * 13 59 21.3630396312 +14 36 06.394991832           ~ 3 0
7 SDSS J135922.59+143300.7 * 13 59 22.5893499288 +14 33 00.911586060           ~ 2 0
8 SDSS J135933.50+142821.6 * 13 59 33.506 +14 28 21.60           ~ 3 0
9 SDSS J135934.37+143017.1 * 13 59 34.376 +14 30 17.13           ~ 3 0
10 SDSS J135934.77+143503.4 * 13 59 34.7743629408 +14 35 03.505285176           ~ 1 0
11 SDSS J135935.66+143735.0 * 13 59 35.6583284592 +14 37 35.059843308           ~ 3 0
12 SDSS J135937.60+142647.6 * 13 59 37.605 +14 26 47.67           ~ 1 0
13 SDSS J135939.36+142638.4 RB? 13 59 39.3634136112 +14 26 38.453374824           ~ 4 0
14 SDSS J135940.18+142428.0 * 13 59 40.1872664856 +14 24 27.995400720           ~ 2 0
15 SDSS J135940.66+142712.0 * 13 59 40.667 +14 27 12.04           ~ 1 0
16 SDSS J135941.78+144035.2 * 13 59 41.784 +14 40 35.26           ~ 1 0
17 SDSS J135942.18+142942.2 Pe* 13 59 42.1843403784 +14 29 42.305898696           ~ 4 0
18 SDSS J135943.12+144054.1 * 13 59 43.1248428456 +14 40 54.190155216           ~ 1 0
19 SDSS J135943.43+143438.3 Pe* 13 59 43.4347261944 +14 34 38.372305116           ~ 2 0
20 SDSS J135944.57+143709.6 * 13 59 44.5744499280 +14 37 09.641227008           ~ 2 0
21 SDSS J135944.70+142601.8 * 13 59 44.7012963504 +14 26 01.874064156           ~ 1 0
22 SDSS J135944.95+143230.1 * 13 59 44.9496075096 +14 32 30.151665744           ~ 4 0
23 SDSS J135945.06+142327.3 Pe* 13 59 45.0626162544 +14 23 27.302615412           ~ 2 0
24 SDSS J135945.71+142552.5 * 13 59 45.710 +14 25 52.57           ~ 2 0
25 SDSS J135945.72+142230.9 Pe* 13 59 45.721 +14 22 30.97           ~ 2 0
26 SDSS J135946.26+143409.2 * 13 59 46.2573166320 +14 34 09.307157196           ~ 4 0
27 [NWG2010] BooI 162 RB? 13 59 46.3367117376 +14 25 11.853652008           ~ 3 0
28 SDSS J135947.06+142852.5 * 13 59 47.067 +14 28 52.56           ~ 4 0
29 SDSS J135947.57+142334.5 * 13 59 47.5723012632 +14 23 34.554434208           ~ 2 0
30 SDSS J135948.14+143646.6 * 13 59 48.1355001504 +14 36 46.682571096           ~ 1 0
31 SDSS J135948.34+143203.5 * 13 59 48.3349369896 +14 32 03.618231180           ~ 5 0
32 SDSS J135948.53+144204.4 * 13 59 48.5372242128 +14 42 04.480545204           ~ 2 0
33 SDSS J135948.96+142428.4 * 13 59 48.9633693096 +14 24 28.525607316           ~ 1 0
34 SDSS J135950.13+141944.4 * 13 59 50.1354146424 +14 19 44.452931736           ~ 2 0
35 SDSS J135950.75+143114.2 Pe* 13 59 50.753 +14 31 14.21           ~ 5 0
36 2MASS J13595091+1430029 Pe* 13 59 50.9110889232 +14 30 02.799243792           ~ 8 0
37 SDSS J135951.08+143049.8 * 13 59 51.076 +14 30 49.82           ~ 4 0
38 SDSS J135951.33+143905.8 RR* 13 59 51.3318572856 +14 39 05.852547252           ~ 7 0
39 SDSS J135951.70+143543.3 * 13 59 51.7065202944 +14 35 43.353309120           ~ 2 0
40 SDSS J135951.88+143018.9 * 13 59 51.8793080184 +14 30 18.939141900           ~ 1 0
41 SDSS J135952.11+144039.3 * 13 59 52.1172302136 +14 40 39.285071616           ~ 1 0
42 SDSS J135952.33+143245.6 * 13 59 52.3286239680 +14 32 45.681344376           ~ 4 0
43 SDSS J135953.00+142232.1 * 13 59 53.009 +14 22 32.15           ~ 1 0
44 SDSS J135953.12+142734.3 * 13 59 53.1173005944 +14 27 34.382796552           ~ 1 0
45 SDSS J135953.75+143055.9 RB? 13 59 53.7512185032 +14 30 56.050724520           ~ 3 0
46 SDSS J135953.93+142951.6 * 13 59 53.934 +14 29 51.68           ~ 1 0
47 SDSS J135954.40+144244.2 * 13 59 54.4056838560 +14 42 44.267711652           ~ 1 0
48 SDSS J135954.89+143715.3 * 13 59 54.8909328168 +14 37 15.409669764           ~ 2 0
49 SDSS J135955.33+143452.8 Pe* 13 59 55.3332023160 +14 34 52.857252840           ~ 3 0
50 SDSS J135955.98+143425.6 Pe* 13 59 55.9825939344 +14 34 25.740128136           ~ 3 0
51 SDSS J135956.41+143556.9 * 13 59 56.4167516064 +14 35 57.043042116           ~ 2 0
52 SDSS J135956.43+142057.4 * 13 59 56.4472045752 +14 20 57.475895352           ~ 2 0
53 SDSS J135956.71+142516.3 * 13 59 56.7144484224 +14 25 16.412201436           ~ 2 0
54 SDSS J135957.85+142802.5 * 13 59 57.8477533968 +14 28 02.556579900           ~ 6 0
55 SDSS J135958.71+144040.2 * 13 59 58.716 +14 40 40.26           ~ 1 0
56 SDSS J135959.70+143633.1 Bla 13 59 59.7018696912 +14 36 33.218960256   21.32 20.59 18.7   ~ 12 1
57 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
58 SDSS J140000.24+143234.9 * 14 00 00.2378660808 +14 32 34.981089468           ~ 1 0
59 SDSS J140000.75+143529.0 * 14 00 00.7488991416 +14 35 29.015816496           ~ 2 0
60 [HWB2008] 40 * 14 00 00.992 +14 31 26.71           ~ 3 0
61 SDSS J140001.42+143424.1 * 14 00 01.4164662888 +14 34 24.143657376           ~ 1 0
62 [NWG2010] BooI 23 RB? 14 00 01.5330244992 +14 21 54.236306196           ~ 3 0
63 SDSS J140001.66+142454.8 * 14 00 01.6652537280 +14 24 54.879003756           ~ 2 0
64 SDSS J140002.23+144114.2 * 14 00 02.2400254752 +14 41 14.262378540           ~ 1 0
65 SDSS J140002.29+142653.4 * 14 00 02.288 +14 26 53.42           ~ 4 0
66 SDSS J140002.44+142249.1 * 14 00 02.4471661200 +14 22 49.192101192           ~ 1 0
67 [HWB2008] 34 * 14 00 03.0708825720 +14 30 23.641561692           ~ 6 0
68 SDSS J140003.32+142851.4 Pe* 14 00 03.3286109544 +14 28 51.496221468           ~ 8 0
69 SDSS J140003.47+143952.2 * 14 00 03.4745025456 +14 39 52.277779944           ~ 1 0
70 SDSS J140005.16+143427.8 * 14 00 05.1636678048 +14 34 27.824683116           ~ 1 0
71 SDSS J140005.33+143023.3 * 14 00 05.3327571744 +14 30 23.392504800           ~ 6 0
72 SDSS J140005.61+142618.8 * 14 00 05.6112063432 +14 26 18.871409652           ~ 3 0
73 SDSS J140008.67+143654.3 * 14 00 08.6695660320 +14 36 54.326334564           ~ 1 0
74 SDSS J140010.30+142626.5 * 14 00 10.308 +14 26 26.58           ~ 1 0
75 SDSS J140010.61+143823.8 Pe* 14 00 10.6105283448 +14 38 23.854797276           ~ 3 0
76 SDSS J140010.69+142924.4 Pe* 14 00 10.6973390664 +14 29 24.439930116           ~ 5 0
77 SDSS J140011.53+142556.0 * 14 00 11.5323033696 +14 25 56.081630244           ~ 4 0
78 [HWB2008] 31 * 14 00 12.2334555120 +14 29 22.022692692           ~ 3 0
79 SDSS J140012.41+143327.3 * 14 00 12.4137451512 +14 33 27.299881944           ~ 1 0
80 SDSS J140012.92+143311.7 RB? 14 00 12.9168376512 +14 33 11.785262436           ~ 7 0
81 SDSS J140013.33+142618.1 * 14 00 13.3410006912 +14 26 18.299203980           ~ 2 0
82 SDSS J140014.67+143930.7 * 14 00 14.6646904968 +14 39 30.731394744           ~ 1 0
83 SDSS J140015.34+142303.0 * 14 00 15.3496828008 +14 23 03.060518208           ~ 2 0
84 SDSS J140015.57+142348.5 * 14 00 15.5738678640 +14 23 48.575161320           ~ 2 0
85 SDSS J140015.81+143446.8 * 14 00 15.811 +14 34 46.86           ~ 1 0
86 [HWB2008] 25 * 14 00 16.1545843656 +14 31 47.033787144           ~ 2 0
87 SDSS J140016.59+143530.0 * 14 00 16.5895895376 +14 35 30.016625280           ~ 2 0
88 SDSS J140016.63+142925.4 * 14 00 16.6271048184 +14 29 25.480999140           ~ 1 0
89 SDSS J140020.58+143734.0 * 14 00 20.589 +14 37 34.06           ~ 1 0
90 SDSS J140021.00+143923.2 * 14 00 21.0015999696 +14 39 23.250427596           ~ 2 0
91 SDSS J140021.84+142553.3 * 14 00 21.8405803944 +14 25 53.397005304           ~ 4 0
92 SDSS J140022.10+143838.2 * 14 00 22.1005232856 +14 38 38.206143276           ~ 3 0
93 SDSS J140022.44+143326.9 * 14 00 22.4421383688 +14 33 26.944408764           ~ 5 0
94 SDSS J140023.33+142608.0 * 14 00 23.337 +14 26 07.99           ~ 4 0
95 SDSS J140023.38+143245.2 * 14 00 23.380 +14 32 45.25           ~ 4 0
96 SDSS J140025.16+143346.7 * 14 00 25.1603215896 +14 33 46.763609940           ~ 1 0
97 SDSS J140025.50+142917.2 * 14 00 25.4985218088 +14 29 17.309135184           ~ 1 0
98 SDSS J140026.25+143434.4 * 14 00 26.2525527120 +14 34 34.439497752           ~ 2 0
99 SDSS J140026.52+142919.8 * 14 00 26.520 +14 29 19.86           ~ 1 0
100 SDSS J140026.57+142948.8 * 14 00 26.5787474712 +14 29 48.843981528           ~ 1 0
101 SDSS J140026.87+144204.3 * 14 00 26.878 +14 42 04.30           ~ 1 0
102 SDSS J140027.04+143830.3 * 14 00 27.0395834688 +14 38 30.369427404           ~ 2 0
103 SDSS J140027.28+143219.5 * 14 00 27.2857964448 +14 32 19.576785912           ~ 4 0
104 SDSS J140028.13+143311.8 * 14 00 28.138 +14 33 11.86           ~ 1 0
105 SDSS J140028.39+142352.6 * 14 00 28.4020517400 +14 23 52.668045564           ~ 1 0
106 SDSS J140028.73+143142.7 * 14 00 28.736 +14 31 42.70           ~ 1 0
107 SDSS J140028.93+142502.2 * 14 00 28.938 +14 25 02.24           ~ 1 0
108 SDSS J140028.95+143833.7 * 14 00 28.950 +14 38 33.70           ~ 1 0
109 SDSS J140031.33+143718.6 * 14 00 31.332 +14 37 18.69           ~ 1 0
110 SDSS J140031.78+142015.5 * 14 00 31.7839966320 +14 20 15.546815016           ~ 2 0
111 SDSS J140031.90+144108.2 * 14 00 31.905 +14 41 08.25           ~ 1 0
112 SDSS J140032.14+143627.6 * 14 00 32.147 +14 36 27.64           ~ 1 0
113 SDSS J140032.37+142735.8 * 14 00 32.372 +14 27 35.88           ~ 1 0
114 SDSS J140032.54+142400.6 * 14 00 32.5499020848 +14 24 00.672715692           ~ 2 0
115 SDSS J140033.07+142959.7 * 14 00 33.0728313624 +14 29 59.702771436           ~ 5 0
116 SDSS J140033.75+142514.3 * 14 00 33.7532305704 +14 25 14.348296992           ~ 2 0
117 SDSS J140035.97+142854.5 * 14 00 35.971 +14 28 54.57           ~ 1 0
118 2MASS J14003738+1428580 Pe* 14 00 37.3906363176 +14 28 58.039918716           ~ 8 0
119 SDSS J140039.56+142827.8 * 14 00 39.5642128992 +14 28 27.879587004           ~ 2 0
120 SDSS J140040.90+143208.1 * 14 00 40.901 +14 32 08.16           ~ 1 0
121 SDSS J140047.55+142412.0 Pe* 14 00 47.5500908832 +14 24 12.055529700           ~ 3 0
122 SDSS J140047.57+142630.2 * 14 00 47.5748686656 +14 26 30.255420048           ~ 1 0
123 SDSS J140053.19+142705.3 * 14 00 53.1890026464 +14 27 05.490718812           ~ 2 0
124 SDSS J140057.91+142854.1 * 14 00 57.918 +14 28 54.10           ~ 1 0
125 ACO 2151 ClG 16 05 15.0 +17 44 55           ~ 594 3
126 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
127 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
128 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
129 NAME Local Group GrG ~ ~           ~ 9325 0

To bookmark this query, right click on this link: simbad:objects in 2011ApJ...736..146K and select 'bookmark this link' or equivalent in the popup menu